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Merge C++ conversion into trunk (5/6 - double_int rewrite)


This implements the double_int rewrite.

See http://gcc.gnu.org/ml/gcc-patches/2012-08/msg00711.html for
details.

Diego.


2012-08-12   Lawrence Crowl  <crowl@google.com>

	* hash-table.h
	(typedef double_int): Change to struct (POD).
	(double_int::make): New overloads for int to double-int conversion.
	(double_int::mask): New.
	(double_int::max_value): New.
	(double_int::min_value): New.
	(double_int::operator ++): New.
	(double_int::operator --): New.
	(double_int::operator *=): New.
	(double_int::operator +=): New.
	(double_int::operator -=): New.
	(double_int::to_signed): New.
	(double_int::to_unsigned): New.
	(double_int::fits_unsigned): New.
	(double_int::fits_signed): New.
	(double_int::fits): New.
	(double_int::trailing_zeros): New.
	(double_int::popcount): New.
	(double_int::multiple_of): New.
	(double_int::set_bit): New.
	(double_int::mul_with_sign): New.
	(double_int::operator * (binary)): New.
	(double_int::operator + (binary)): New.
	(double_int::operator - (binary)): New.
	(double_int::operator - (unary)): New.
	(double_int::operator ~ (unary)): New.
	(double_int::operator & (binary)): New.
	(double_int::operator | (binary)): New.
	(double_int::operator ^ (binary)): New.
	(double_int::and_not): New.
	(double_int::lshift): New.
	(double_int::rshift): New.
	(double_int::alshift): New.
	(double_int::arshift): New.
	(double_int::llshift): New.
	(double_int::lrshift): New.
	(double_int::lrotate): New.
	(double_int::rrotate): New.
	(double_int::div): New.
	(double_int::sdiv): New.
	(double_int::udiv): New.
	(double_int::mod): New.
	(double_int::smod): New.
	(double_int::umod): New.
	(double_int::divmod): New.
	(double_int::sdivmod): New.
	(double_int::udivmod): New.
	(double_int::ext): New.
	(double_int::zext): New.
	(double_int::sext): New.
	(double_int::is_zero): New.
	(double_int::is_one): New.
	(double_int::is_minus_one): New.
	(double_int::is_negative): New.
	(double_int::cmp): New.
	(double_int::ucmp): New.
	(double_int::scmp): New.
	(double_int::ult): New.
	(double_int::ugt): New.
	(double_int::slt): New.
	(double_int::sgt): New.
	(double_int::max): New.
	(double_int::smax): New.
	(double_int::umax): New.
	(double_int::min): New.
	(double_int::smin): New.
	(double_int::umin): New.
	(double_int::operator ==): New.
	(double_int::operator !=): New.
	(shwi_to_double_int): Change implementation to use member function.
	(double_int_minus_one): Likewise.
	(double_int_zero): Likewise.
	(double_int_one): Likewise.
	(double_int_two): Likewise.
	(double_int_ten): Likewise.
	(uhwi_to_double_int): Likewise.
	(double_int_to_shwi): Likewise.
	(double_int_to_uhwi): Likewise.
	(double_int_fits_in_uhwi_p): Likewise.
	(double_int_fits_in_shwi_p): Likewise.
	(double_int_fits_in_hwi_p): Likewise.
	(double_int_mul): Likewise.
	(double_int_mul_with_sign): Likewise.
	(double_int_add): Likewise.
	(double_int_sub): Likewise.
	(double_int_neg): Likewise.
	(double_int_div): Likewise.
	(double_int_sdiv): Likewise.
	(double_int_udiv): Likewise.
	(double_int_mod): Likewise.
	(double_int_smod): Likewise.
	(double_int_umod): Likewise.
	(double_int_divmod): Likewise.
	(double_int_sdivmod): Likewise.
	(double_int_udivmod): Likewise.
	(double_int_multiple_of): Likewise.
	(double_int_setbit): Likewise.
	(double_int_ctz): Likewise.
	(double_int_not): Likewise.
	(double_int_ior): Likewise.
	(double_int_and): Likewise.
	(double_int_and_not): Likewise.
	(double_int_xor): Likewise.
	(double_int_lshift): Likewise.
	(double_int_rshift): Likewise.
	(double_int_lrotate): Likewise.
	(double_int_rrotate): Likewise.
	(double_int_cmp): Likewise.
	(double_int_scmp): Likewise.
	(double_int_ucmp): Likewise.
	(double_int_max): Likewise.
	(double_int_smax): Likewise.
	(double_int_umax): Likewise.
	(double_int_min): Likewise.
	(double_int_smin): Likewise.
	(double_int_umin): Likewise.
	(double_int_ext): Likewise.
	(double_int_sext): Likewise.
	(double_int_zext): Likewise.
	(double_int_mask): Likewise.
	(double_int_max_value): Likewise.
	(double_int_min_value): Likewise.
	(double_int_zero_p): Likewise.
	(double_int_one_p): Likewise.
	(double_int_minus_one_p): Likewise.
	(double_int_equal_p): Likewise.
	(double_int_popcount): Likewise.
	* hash-table.c
	(double_int_mask): Reuse implementation for double_int::mask.
	(double_int_max_value): Likewise.
	(double_int_min_value): Likewise.
	(double_int_ext): Likewise.
	(double_int_zext): Likewise.
	(double_int_sext): Likewise.
	(double_int_mul_with_sign): Likewise.
	(double_int_divmod): Likewise.
	(double_int_sdivmod): Likewise.
	(double_int_udivmod): Likewise.
	(double_int_div): Likewise.
	(double_int_sdiv): Likewise.
	(double_int_udiv): Likewise.
	(double_int_mod): Likewise.
	(double_int_smod): Likewise.
	(double_int_umod): Likewise.
	(double_int_multiple_of): Likewise.
	(double_int_lshift): Likewise.
	(double_int_rshift): Likewise.
	(double_int_lrotate): Likewise.
	(double_int_rrotate): Likewise.
	(double_int_cmp): Likewise.
	(double_int_ucmp): Likewise.
	(double_int_scmp): Likewise.
	(double_int_max): Likewise.
	(double_int_smax): Likewise.
	(double_int_umax): Likewise.
	(double_int_min): Likewise.
	(double_int_smin): Likewise.
	(double_int_umin): Likewise.
	(double_int_min): Likewise.
	(double_int_min): Likewise.
	(double_int_min): Likewise.
	(double_int_min): Likewise.
	(double_int_min): Likewise.
	(double_int_min): Likewise.
	(double_int::alshift): New.
	(double_int::arshift): New.
	(double_int::llshift): New.
	(double_int::lrshift): New.
	(double_int::ult): New.
	(double_int::ugt): New.
	(double_int::slt): New.
	(double_int::sgt): New.
	(double_int_setbit): Reuse implementation for double_int::set_bit,
	which avoids a name conflict with a macro.
	(double_int_double_int_ctz): Reuse implementation for
	double_int::trailing_zeros.
	(double_int_fits_in_shwi_p): Reuse implementation for
	double_int::fits_signed.
	(double_int_fits_in_hwi_p): Reuse implementation for double_int::fits.
	(double_int_mul): Reuse implementation for binary
	double_int::operator *.
	(double_int_add): Likewise.
	(double_int_sub): Likewise.
	(double_int_neg): Reuse implementation for unary
	double_int::operator -.
	(double_int_max_value): Likewise.
	* fixed-value.c: Change to use member functions introduced above.

diff --git a/gcc/double-int.c b/gcc/double-int.c
index 1204dc7..953f081 100644
--- a/gcc/double-int.c
+++ b/gcc/double-int.c
@@ -610,7 +610,7 @@ div_and_round_double (unsigned code, int uns,
 /* Returns mask for PREC bits.  */
 
 double_int
-double_int_mask (unsigned prec)
+double_int::mask (unsigned prec)
 {
   unsigned HOST_WIDE_INT m;
   double_int mask;
@@ -635,20 +635,20 @@ double_int_mask (unsigned prec)
    of precision PREC.  */
 
 double_int
-double_int_max_value (unsigned int prec, bool uns)
+double_int::max_value (unsigned int prec, bool uns)
 {
-  return double_int_mask (prec - (uns ? 0 : 1));
+  return double_int::mask (prec - (uns ? 0 : 1));
 }
 
 /* Returns a minimum value for signed or unsigned integer
    of precision PREC.  */
 
 double_int
-double_int_min_value (unsigned int prec, bool uns)
+double_int::min_value (unsigned int prec, bool uns)
 {
   if (uns)
     return double_int_zero;
-  return double_int_lshift (double_int_one, prec - 1, prec, false);
+  return double_int_one.lshift (prec - 1, prec, false);
 }
 
 /* Clears the bits of CST over the precision PREC.  If UNS is false, the bits
@@ -659,20 +659,21 @@ double_int_min_value (unsigned int prec, bool uns)
    of CST, with the given signedness.  */
 
 double_int
-double_int_ext (double_int cst, unsigned prec, bool uns)
+double_int::ext (unsigned prec, bool uns) const
 {
   if (uns)
-    return double_int_zext (cst, prec);
+    return this->zext (prec);
   else
-    return double_int_sext (cst, prec);
+    return this->sext (prec);
 }
 
-/* The same as double_int_ext with UNS = true.  */
+/* The same as double_int::ext with UNS = true.  */
 
 double_int
-double_int_zext (double_int cst, unsigned prec)
+double_int::zext (unsigned prec) const
 {
-  double_int mask = double_int_mask (prec);
+  const double_int &cst = *this;
+  double_int mask = double_int::mask (prec);
   double_int r;
 
   r.low = cst.low & mask.low;
@@ -681,12 +682,13 @@ double_int_zext (double_int cst, unsigned prec)
   return r;
 }
 
-/* The same as double_int_ext with UNS = false.  */
+/* The same as double_int::ext with UNS = false.  */
 
 double_int
-double_int_sext (double_int cst, unsigned prec)
+double_int::sext (unsigned prec) const
 {
-  double_int mask = double_int_mask (prec);
+  const double_int &cst = *this;
+  double_int mask = double_int::mask (prec);
   double_int r;
   unsigned HOST_WIDE_INT snum;
 
@@ -714,8 +716,9 @@ double_int_sext (double_int cst, unsigned prec)
 /* Returns true if CST fits in signed HOST_WIDE_INT.  */
 
 bool
-double_int_fits_in_shwi_p (double_int cst)
+double_int::fits_signed () const
 {
+  const double_int &cst = *this;
   if (cst.high == 0)
     return (HOST_WIDE_INT) cst.low >= 0;
   else if (cst.high == -1)
@@ -728,19 +731,20 @@ double_int_fits_in_shwi_p (double_int cst)
    unsigned HOST_WIDE_INT if UNS is true.  */
 
 bool
-double_int_fits_in_hwi_p (double_int cst, bool uns)
+double_int::fits (bool uns) const
 {
   if (uns)
-    return double_int_fits_in_uhwi_p (cst);
+    return this->fits_unsigned ();
   else
-    return double_int_fits_in_shwi_p (cst);
+    return this->fits_signed ();
 }
 
 /* Returns A * B.  */
 
 double_int
-double_int_mul (double_int a, double_int b)
+double_int::operator * (double_int b) const
 {
+  const double_int &a = *this;
   double_int ret;
   mul_double (a.low, a.high, b.low, b.high, &ret.low, &ret.high);
   return ret;
@@ -750,9 +754,9 @@ double_int_mul (double_int a, double_int b)
    *OVERFLOW is set to nonzero.  */
 
 double_int
-double_int_mul_with_sign (double_int a, double_int b,
-                          bool unsigned_p, int *overflow)
+double_int::mul_with_sign (double_int b, bool unsigned_p, int *overflow) const
 {
+  const double_int &a = *this;
   double_int ret;
   *overflow = mul_double_with_sign (a.low, a.high, b.low, b.high,
                                     &ret.low, &ret.high, unsigned_p);
@@ -762,8 +766,9 @@ double_int_mul_with_sign (double_int a, double_int b,
 /* Returns A + B.  */
 
 double_int
-double_int_add (double_int a, double_int b)
+double_int::operator + (double_int b) const
 {
+  const double_int &a = *this;
   double_int ret;
   add_double (a.low, a.high, b.low, b.high, &ret.low, &ret.high);
   return ret;
@@ -772,8 +777,9 @@ double_int_add (double_int a, double_int b)
 /* Returns A - B.  */
 
 double_int
-double_int_sub (double_int a, double_int b)
+double_int::operator - (double_int b) const
 {
+  const double_int &a = *this;
   double_int ret;
   neg_double (b.low, b.high, &b.low, &b.high);
   add_double (a.low, a.high, b.low, b.high, &ret.low, &ret.high);
@@ -783,8 +789,9 @@ double_int_sub (double_int a, double_int b)
 /* Returns -A.  */
 
 double_int
-double_int_neg (double_int a)
+double_int::operator - () const
 {
+  const double_int &a = *this;
   double_int ret;
   neg_double (a.low, a.high, &ret.low, &ret.high);
   return ret;
@@ -796,9 +803,10 @@ double_int_neg (double_int a)
    stored to MOD.  */
 
 double_int
-double_int_divmod (double_int a, double_int b, bool uns, unsigned code,
-		   double_int *mod)
+double_int::divmod (double_int b, bool uns, unsigned code,
+		    double_int *mod) const
 {
+  const double_int &a = *this;
   double_int ret;
 
   div_and_round_double (code, uns, a.low, a.high,
@@ -807,20 +815,20 @@ double_int_divmod (double_int a, double_int b, bool uns, unsigned code,
   return ret;
 }
 
-/* The same as double_int_divmod with UNS = false.  */
+/* The same as double_int::divmod with UNS = false.  */
 
 double_int
-double_int_sdivmod (double_int a, double_int b, unsigned code, double_int *mod)
+double_int::sdivmod (double_int b, unsigned code, double_int *mod) const
 {
-  return double_int_divmod (a, b, false, code, mod);
+  return this->divmod (b, false, code, mod);
 }
 
-/* The same as double_int_divmod with UNS = true.  */
+/* The same as double_int::divmod with UNS = true.  */
 
 double_int
-double_int_udivmod (double_int a, double_int b, unsigned code, double_int *mod)
+double_int::udivmod (double_int b, unsigned code, double_int *mod) const
 {
-  return double_int_divmod (a, b, true, code, mod);
+  return this->divmod (b, true, code, mod);
 }
 
 /* Returns A / B (computed as unsigned depending on UNS, and rounded as
@@ -828,27 +836,27 @@ double_int_udivmod (double_int a, double_int b, unsigned code, double_int *mod)
    must be included before tree.h.  */
 
 double_int
-double_int_div (double_int a, double_int b, bool uns, unsigned code)
+double_int::div (double_int b, bool uns, unsigned code) const
 {
   double_int mod;
 
-  return double_int_divmod (a, b, uns, code, &mod);
+  return this->divmod (b, uns, code, &mod);
 }
 
-/* The same as double_int_div with UNS = false.  */
+/* The same as double_int::div with UNS = false.  */
 
 double_int
-double_int_sdiv (double_int a, double_int b, unsigned code)
+double_int::sdiv (double_int b, unsigned code) const
 {
-  return double_int_div (a, b, false, code);
+  return this->div (b, false, code);
 }
 
-/* The same as double_int_div with UNS = true.  */
+/* The same as double_int::div with UNS = true.  */
 
 double_int
-double_int_udiv (double_int a, double_int b, unsigned code)
+double_int::udiv (double_int b, unsigned code) const
 {
-  return double_int_div (a, b, true, code);
+  return this->div (b, true, code);
 }
 
 /* Returns A % B (computed as unsigned depending on UNS, and rounded as
@@ -856,28 +864,28 @@ double_int_udiv (double_int a, double_int b, unsigned code)
    must be included before tree.h.  */
 
 double_int
-double_int_mod (double_int a, double_int b, bool uns, unsigned code)
+double_int::mod (double_int b, bool uns, unsigned code) const
 {
   double_int mod;
 
-  double_int_divmod (a, b, uns, code, &mod);
+  this->divmod (b, uns, code, &mod);
   return mod;
 }
 
-/* The same as double_int_mod with UNS = false.  */
+/* The same as double_int::mod with UNS = false.  */
 
 double_int
-double_int_smod (double_int a, double_int b, unsigned code)
+double_int::smod (double_int b, unsigned code) const
 {
-  return double_int_mod (a, b, false, code);
+  return this->mod (b, false, code);
 }
 
-/* The same as double_int_mod with UNS = true.  */
+/* The same as double_int::mod with UNS = true.  */
 
 double_int
-double_int_umod (double_int a, double_int b, unsigned code)
+double_int::umod (double_int b, unsigned code) const
 {
-  return double_int_mod (a, b, true, code);
+  return this->mod (b, true, code);
 }
 
 /* Return TRUE iff PRODUCT is an integral multiple of FACTOR, and return
@@ -885,13 +893,13 @@ double_int_umod (double_int a, double_int b, unsigned code)
    unchanged.  */
 
 bool
-double_int_multiple_of (double_int product, double_int factor,
-			bool unsigned_p, double_int *multiple)
+double_int::multiple_of (double_int factor,
+			 bool unsigned_p, double_int *multiple) const
 {
   double_int remainder;
-  double_int quotient = double_int_divmod (product, factor, unsigned_p,
+  double_int quotient = this->divmod (factor, unsigned_p,
 					   TRUNC_DIV_EXPR, &remainder);
-  if (double_int_zero_p (remainder))
+  if (remainder.is_zero ())
     {
       *multiple = quotient;
       return true;
@@ -902,8 +910,9 @@ double_int_multiple_of (double_int product, double_int factor,
 
 /* Set BITPOS bit in A.  */
 double_int
-double_int_setbit (double_int a, unsigned bitpos)
+double_int::set_bit (unsigned bitpos) const
 {
+  double_int a = *this;
   if (bitpos < HOST_BITS_PER_WIDE_INT)
     a.low |= (unsigned HOST_WIDE_INT) 1 << bitpos;
   else
@@ -914,8 +923,9 @@ double_int_setbit (double_int a, unsigned bitpos)
 
 /* Count trailing zeros in A.  */
 int
-double_int_ctz (double_int a)
+double_int::trailing_zeros () const
 {
+  const double_int &a = *this;
   unsigned HOST_WIDE_INT w = a.low ? a.low : (unsigned HOST_WIDE_INT) a.high;
   unsigned bits = a.low ? 0 : HOST_BITS_PER_WIDE_INT;
   if (!w)
@@ -929,30 +939,76 @@ double_int_ctz (double_int a)
    otherwise use logical shift.  */
 
 double_int
-double_int_lshift (double_int a, HOST_WIDE_INT count, unsigned int prec, bool arith)
+double_int::lshift (HOST_WIDE_INT count, unsigned int prec, bool arith) const
 {
+  const double_int &a = *this;
   double_int ret;
   lshift_double (a.low, a.high, count, prec, &ret.low, &ret.high, arith);
   return ret;
 }
 
-/* Shift A rigth by COUNT places keeping only PREC bits of result.  Shift
+/* Shift A right by COUNT places keeping only PREC bits of result.  Shift
    left if COUNT is negative.  ARITH true specifies arithmetic shifting;
    otherwise use logical shift.  */
 
 double_int
-double_int_rshift (double_int a, HOST_WIDE_INT count, unsigned int prec, bool arith)
+double_int::rshift (HOST_WIDE_INT count, unsigned int prec, bool arith) const
 {
+  const double_int &a = *this;
   double_int ret;
   lshift_double (a.low, a.high, -count, prec, &ret.low, &ret.high, arith);
   return ret;
 }
 
+/* Arithmetic shift A left by COUNT places keeping only PREC bits of result.
+   Shift right if COUNT is negative.  */
+
+double_int
+double_int::alshift (HOST_WIDE_INT count, unsigned int prec) const
+{
+  double_int r;
+  lshift_double (low, high, count, prec, &r.low, &r.high, true);
+  return r;
+}
+
+/* Arithmetic shift A right by COUNT places keeping only PREC bits of result.
+   Shift left if COUNT is negative.  */
+
+double_int
+double_int::arshift (HOST_WIDE_INT count, unsigned int prec) const
+{
+  double_int r;
+  lshift_double (low, high, -count, prec, &r.low, &r.high, true);
+  return r;
+}
+
+/* Logical shift A left by COUNT places keeping only PREC bits of result.
+   Shift right if COUNT is negative.  */
+
+double_int
+double_int::llshift (HOST_WIDE_INT count, unsigned int prec) const
+{
+  double_int r;
+  lshift_double (low, high, count, prec, &r.low, &r.high, false);
+  return r;
+}
+
+/* Logical shift A right by COUNT places keeping only PREC bits of result.
+   Shift left if COUNT is negative.  */
+
+double_int
+double_int::lrshift (HOST_WIDE_INT count, unsigned int prec) const
+{
+  double_int r;
+  lshift_double (low, high, -count, prec, &r.low, &r.high, false);
+  return r;
+}
+
 /* Rotate  A left by COUNT places keeping only PREC bits of result.
    Rotate right if COUNT is negative.  */
 
 double_int
-double_int_lrotate (double_int a, HOST_WIDE_INT count, unsigned int prec)
+double_int::lrotate (HOST_WIDE_INT count, unsigned int prec) const
 {
   double_int t1, t2;
 
@@ -960,17 +1016,17 @@ double_int_lrotate (double_int a, HOST_WIDE_INT count, unsigned int prec)
   if (count < 0)
     count += prec;
 
-  t1 = double_int_lshift (a, count, prec, false);
-  t2 = double_int_rshift (a, prec - count, prec, false);
+  t1 = this->lshift (count, prec, false);
+  t2 = this->rshift (prec - count, prec, false);
 
-  return double_int_ior (t1, t2);
+  return t1 | t2;
 }
 
 /* Rotate A rigth by COUNT places keeping only PREC bits of result.
    Rotate right if COUNT is negative.  */
 
 double_int
-double_int_rrotate (double_int a, HOST_WIDE_INT count, unsigned int prec)
+double_int::rrotate (HOST_WIDE_INT count, unsigned int prec) const
 {
   double_int t1, t2;
 
@@ -978,30 +1034,31 @@ double_int_rrotate (double_int a, HOST_WIDE_INT count, unsigned int prec)
   if (count < 0)
     count += prec;
 
-  t1 = double_int_rshift (a, count, prec, false);
-  t2 = double_int_lshift (a, prec - count, prec, false);
+  t1 = this->rshift (count, prec, false);
+  t2 = this->lshift (prec - count, prec, false);
 
-  return double_int_ior (t1, t2);
+  return t1 | t2;
 }
 
 /* Returns -1 if A < B, 0 if A == B and 1 if A > B.  Signedness of the
    comparison is given by UNS.  */
 
 int
-double_int_cmp (double_int a, double_int b, bool uns)
+double_int::cmp (double_int b, bool uns) const
 {
   if (uns)
-    return double_int_ucmp (a, b);
+    return this->ucmp (b);
   else
-    return double_int_scmp (a, b);
+    return this->scmp (b);
 }
 
 /* Compares two unsigned values A and B.  Returns -1 if A < B, 0 if A == B,
    and 1 if A > B.  */
 
 int
-double_int_ucmp (double_int a, double_int b)
+double_int::ucmp (double_int b) const
 {
+  const double_int &a = *this;
   if ((unsigned HOST_WIDE_INT) a.high < (unsigned HOST_WIDE_INT) b.high)
     return -1;
   if ((unsigned HOST_WIDE_INT) a.high > (unsigned HOST_WIDE_INT) b.high)
@@ -1018,8 +1075,9 @@ double_int_ucmp (double_int a, double_int b)
    and 1 if A > B.  */
 
 int
-double_int_scmp (double_int a, double_int b)
+double_int::scmp (double_int b) const
 {
+  const double_int &a = *this;
   if (a.high < b.high)
     return -1;
   if (a.high > b.high)
@@ -1032,49 +1090,111 @@ double_int_scmp (double_int a, double_int b)
   return 0;
 }
 
+/* Compares two unsigned values A and B for less-than.  */
+
+bool
+double_int::ult (double_int b) const
+{
+  if ((unsigned HOST_WIDE_INT) high < (unsigned HOST_WIDE_INT) b.high)
+    return true;
+  if ((unsigned HOST_WIDE_INT) high > (unsigned HOST_WIDE_INT) b.high)
+    return false;
+  if (low < b.low)
+    return true;
+  return false;
+}
+
+/* Compares two unsigned values A and B for greater-than.  */
+
+bool
+double_int::ugt (double_int b) const
+{
+  if ((unsigned HOST_WIDE_INT) high > (unsigned HOST_WIDE_INT) b.high)
+    return true;
+  if ((unsigned HOST_WIDE_INT) high < (unsigned HOST_WIDE_INT) b.high)
+    return false;
+  if (low > b.low)
+    return true;
+  return false;
+}
+
+/* Compares two signed values A and B for less-than.  */
+
+bool
+double_int::slt (double_int b) const
+{
+  if (high < b.high)
+    return true;
+  if (high > b.high)
+    return false;
+  if (low < b.low)
+    return true;
+  return false;
+}
+
+/* Compares two signed values A and B for greater-than.  */
+
+bool
+double_int::sgt (double_int b) const
+{
+  if (high > b.high)
+    return true;
+  if (high < b.high)
+    return false;
+  if (low > b.low)
+    return true;
+  return false;
+}
+
+
 /* Compares two values A and B.  Returns max value.  Signedness of the
    comparison is given by UNS.  */
 
 double_int
-double_int_max (double_int a, double_int b, bool uns)
+double_int::max (double_int b, bool uns)
 {
-  return (double_int_cmp (a, b, uns) == 1) ? a : b;
+  return (this->cmp (b, uns) == 1) ? *this : b;
 }
 
 /* Compares two signed values A and B.  Returns max value.  */
 
-double_int double_int_smax (double_int a, double_int b)
+double_int
+double_int::smax (double_int b)
 {
-  return (double_int_scmp (a, b) == 1) ? a : b;
+  return (this->scmp (b) == 1) ? *this : b;
 }
 
 /* Compares two unsigned values A and B.  Returns max value.  */
 
-double_int double_int_umax (double_int a, double_int b)
+double_int
+double_int::umax (double_int b)
 {
-  return (double_int_ucmp (a, b) == 1) ? a : b;
+  return (this->ucmp (b) == 1) ? *this : b;
 }
 
 /* Compares two values A and B.  Returns mix value.  Signedness of the
    comparison is given by UNS.  */
 
-double_int double_int_min (double_int a, double_int b, bool uns)
+double_int
+double_int::min (double_int b, bool uns)
 {
-  return (double_int_cmp (a, b, uns) == -1) ? a : b;
+  return (this->cmp (b, uns) == -1) ? *this : b;
 }
 
 /* Compares two signed values A and B.  Returns min value.  */
 
-double_int double_int_smin (double_int a, double_int b)
+double_int
+double_int::smin (double_int b)
 {
-  return (double_int_scmp (a, b) == -1) ? a : b;
+  return (this->scmp (b) == -1) ? *this : b;
 }
 
 /* Compares two unsigned values A and B.  Returns min value.  */
 
-double_int double_int_umin (double_int a, double_int b)
+double_int
+double_int::umin (double_int b)
 {
-  return (double_int_ucmp (a, b) == -1) ? a : b;
+  return (this->ucmp (b) == -1) ? *this : b;
 }
 
 /* Splits last digit of *CST (taken as unsigned) in BASE and returns it.  */
@@ -1102,19 +1222,19 @@ dump_double_int (FILE *file, double_int cst, bool uns)
   unsigned digits[100], n;
   int i;
 
-  if (double_int_zero_p (cst))
+  if (cst.is_zero ())
     {
       fprintf (file, "0");
       return;
     }
 
-  if (!uns && double_int_negative_p (cst))
+  if (!uns && cst.is_negative ())
     {
       fprintf (file, "-");
-      cst = double_int_neg (cst);
+      cst = -cst;
     }
 
-  for (n = 0; !double_int_zero_p (cst); n++)
+  for (n = 0; !cst.is_zero (); n++)
     digits[n] = double_int_split_digit (&cst, 10);
   for (i = n - 1; i >= 0; i--)
     fprintf (file, "%u", digits[i]);
@@ -1130,10 +1250,10 @@ mpz_set_double_int (mpz_t result, double_int val, bool uns)
   bool negate = false;
   unsigned HOST_WIDE_INT vp[2];
 
-  if (!uns && double_int_negative_p (val))
+  if (!uns && val.is_negative ())
     {
       negate = true;
-      val = double_int_neg (val);
+      val = -val;
     }
 
   vp[0] = val.low;
@@ -1191,9 +1311,9 @@ mpz_get_double_int (const_tree type, mpz_t val, bool wrap)
   res.low = vp[0];
   res.high = (HOST_WIDE_INT) vp[1];
 
-  res = double_int_ext (res, TYPE_PRECISION (type), TYPE_UNSIGNED (type));
+  res = res.ext (TYPE_PRECISION (type), TYPE_UNSIGNED (type));
   if (mpz_sgn (val) < 0)
-    res = double_int_neg (res);
+    res = -res;
 
   return res;
 }
diff --git a/gcc/double-int.h b/gcc/double-int.h
index 4c4c1b3..b1c54c7 100644
--- a/gcc/double-int.h
+++ b/gcc/double-int.h
@@ -50,10 +50,132 @@ along with GCC; see the file COPYING3.  If not see
    numbers with precision higher than HOST_WIDE_INT).  It might be less
    confusing to have them both signed or both unsigned.  */
 
-typedef struct
+typedef struct double_int
 {
+public:
+  /* Normally, we would define constructors to create instances.
+     Two things prevent us from doing so.
+     First, defining a constructor makes the class non-POD in C++03,
+     and we certainly want double_int to be a POD.
+     Second, the GCC conding conventions prefer explicit conversion,
+     and explicit conversion operators are not available until C++11.  */
+
+  static double_int from_unsigned (unsigned HOST_WIDE_INT cst);
+  static double_int from_signed (HOST_WIDE_INT cst);
+
+  /* No copy assignment operator or destructor to keep the type a POD.  */
+
+  /* There are some special value-creation static member functions.  */
+
+  static double_int mask (unsigned prec);
+  static double_int max_value (unsigned int prec, bool uns);
+  static double_int min_value (unsigned int prec, bool uns);
+
+  /* The following functions are mutating operations.  */
+
+  double_int &operator ++(); // prefix
+  double_int &operator --(); // prefix
+  double_int &operator *= (double_int);
+  double_int &operator += (double_int);
+  double_int &operator -= (double_int);
+
+  /* The following functions are non-mutating operations.  */
+
+  /* Conversion functions.  */
+
+  HOST_WIDE_INT to_signed () const;
+  unsigned HOST_WIDE_INT to_unsigned () const;
+
+  /* Conversion query functions.  */
+
+  bool fits_unsigned() const;
+  bool fits_signed() const;
+  bool fits (bool uns) const;
+
+  /* Attribute query functions.  */
+
+  int trailing_zeros () const;
+  int popcount () const;
+
+  /* Arithmetic query operations.  */
+
+  bool multiple_of (double_int, bool, double_int *) const;
+
+  /* Arithmetic operation functions.  */
+
+  double_int set_bit (unsigned) const;
+  double_int mul_with_sign (double_int, bool, int *) const;
+
+  double_int operator * (double_int b) const;
+  double_int operator + (double_int b) const;
+  double_int operator - (double_int b) const;
+  double_int operator - () const;
+  double_int operator ~ () const;
+  double_int operator & (double_int b) const;
+  double_int operator | (double_int b) const;
+  double_int operator ^ (double_int b) const;
+  double_int and_not (double_int b) const;
+
+  double_int lshift (HOST_WIDE_INT count, unsigned int prec, bool arith) const;
+  double_int rshift (HOST_WIDE_INT count, unsigned int prec, bool arith) const;
+  double_int alshift (HOST_WIDE_INT count, unsigned int prec) const;
+  double_int arshift (HOST_WIDE_INT count, unsigned int prec) const;
+  double_int llshift (HOST_WIDE_INT count, unsigned int prec) const;
+  double_int lrshift (HOST_WIDE_INT count, unsigned int prec) const;
+  double_int lrotate (HOST_WIDE_INT count, unsigned int prec) const;
+  double_int rrotate (HOST_WIDE_INT count, unsigned int prec) const;
+
+  /* You must ensure that double_int::ext is called on the operands
+     of the following operations, if the precision of the numbers
+     is less than HOST_BITS_PER_DOUBLE_INT bits.  */
+  double_int div (double_int, bool, unsigned) const;
+  double_int sdiv (double_int, unsigned) const;
+  double_int udiv (double_int, unsigned) const;
+  double_int mod (double_int, bool, unsigned) const;
+  double_int smod (double_int, unsigned) const;
+  double_int umod (double_int, unsigned) const;
+  double_int divmod (double_int, bool, unsigned, double_int *) const;
+  double_int sdivmod (double_int, unsigned, double_int *) const;
+  double_int udivmod (double_int, unsigned, double_int *) const;
+
+  /* Precision control functions.  */
+
+  double_int ext (unsigned prec, bool uns) const;
+  double_int zext (unsigned prec) const;
+  double_int sext (unsigned prec) const;
+
+  /* Comparative functions.  */
+
+  bool is_zero () const;
+  bool is_one () const;
+  bool is_minus_one () const;
+  bool is_negative () const;
+
+  int cmp (double_int b, bool uns) const;
+  int ucmp (double_int b) const;
+  int scmp (double_int b) const;
+
+  bool ult (double_int b) const;
+  bool ugt (double_int b) const;
+  bool slt (double_int b) const;
+  bool sgt (double_int b) const;
+
+  double_int max (double_int b, bool uns);
+  double_int smax (double_int b);
+  double_int umax (double_int b);
+
+  double_int min (double_int b, bool uns);
+  double_int smin (double_int b);
+  double_int umin (double_int b);
+
+  bool operator == (double_int cst2) const;
+  bool operator != (double_int cst2) const;
+
+  /* Please migrate away from using these member variables publically.  */
+
   unsigned HOST_WIDE_INT low;
   HOST_WIDE_INT high;
+
 } double_int;
 
 #define HOST_BITS_PER_DOUBLE_INT (2 * HOST_BITS_PER_WIDE_INT)
@@ -63,66 +185,148 @@ typedef struct
 /* Constructs double_int from integer CST.  The bits over the precision of
    HOST_WIDE_INT are filled with the sign bit.  */
 
-static inline double_int
-shwi_to_double_int (HOST_WIDE_INT cst)
+inline
+double_int double_int::from_signed (HOST_WIDE_INT cst)
 {
   double_int r;
-
   r.low = (unsigned HOST_WIDE_INT) cst;
   r.high = cst < 0 ? -1 : 0;
-
   return r;
 }
 
+/* FIXME(crowl): Remove after converting callers.  */
+static inline double_int
+shwi_to_double_int (HOST_WIDE_INT cst)
+{
+  return double_int::from_signed (cst);
+}
+
 /* Some useful constants.  */
+/* FIXME(crowl): Maybe remove after converting callers?
+   The problem is that a named constant would not be as optimizable,
+   while the functional syntax is more verbose.  */
 
-#define double_int_minus_one (shwi_to_double_int (-1))
-#define double_int_zero (shwi_to_double_int (0))
-#define double_int_one (shwi_to_double_int (1))
-#define double_int_two (shwi_to_double_int (2))
-#define double_int_ten (shwi_to_double_int (10))
+#define double_int_minus_one (double_int::from_signed (-1))
+#define double_int_zero (double_int::from_signed (0))
+#define double_int_one (double_int::from_signed (1))
+#define double_int_two (double_int::from_signed (2))
+#define double_int_ten (double_int::from_signed (10))
 
 /* Constructs double_int from unsigned integer CST.  The bits over the
    precision of HOST_WIDE_INT are filled with zeros.  */
 
-static inline double_int
-uhwi_to_double_int (unsigned HOST_WIDE_INT cst)
+inline
+double_int double_int::from_unsigned (unsigned HOST_WIDE_INT cst)
 {
   double_int r;
-
   r.low = cst;
   r.high = 0;
-
   return r;
 }
 
+/* FIXME(crowl): Remove after converting callers.  */
+static inline double_int
+uhwi_to_double_int (unsigned HOST_WIDE_INT cst)
+{
+  return double_int::from_unsigned (cst);
+}
+
+inline double_int &
+double_int::operator ++ ()
+{
+  *this + double_int_one;
+  return *this;
+}
+
+inline double_int &
+double_int::operator -- ()
+{
+  *this - double_int_one;
+  return *this;
+}
+
+inline double_int &
+double_int::operator *= (double_int b)
+{
+  *this = *this * b;
+  return *this;
+}
+
+inline double_int &
+double_int::operator += (double_int b)
+{
+  *this = *this + b;
+  return *this;
+}
+
+inline double_int &
+double_int::operator -= (double_int b)
+{
+  *this = *this - b;
+  return *this;
+}
+
 /* Returns value of CST as a signed number.  CST must satisfy
-   double_int_fits_in_shwi_p.  */
+   double_int::fits_signed.  */
 
+inline HOST_WIDE_INT
+double_int::to_signed () const
+{
+  return (HOST_WIDE_INT) low;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline HOST_WIDE_INT
 double_int_to_shwi (double_int cst)
 {
-  return (HOST_WIDE_INT) cst.low;
+  return cst.to_signed ();
 }
 
 /* Returns value of CST as an unsigned number.  CST must satisfy
-   double_int_fits_in_uhwi_p.  */
+   double_int::fits_unsigned.  */
+
+inline unsigned HOST_WIDE_INT
+double_int::to_unsigned () const
+{
+  return low;
+}
 
+/* FIXME(crowl): Remove after converting callers.  */
 static inline unsigned HOST_WIDE_INT
 double_int_to_uhwi (double_int cst)
 {
-  return cst.low;
+  return cst.to_unsigned ();
 }
 
-bool double_int_fits_in_hwi_p (double_int, bool);
-bool double_int_fits_in_shwi_p (double_int);
-
 /* Returns true if CST fits in unsigned HOST_WIDE_INT.  */
 
+inline bool
+double_int::fits_unsigned () const
+{
+  return high == 0;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline bool
 double_int_fits_in_uhwi_p (double_int cst)
 {
-  return cst.high == 0;
+  return cst.fits_unsigned ();
+}
+
+/* Returns true if CST fits in signed HOST_WIDE_INT.  */
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline bool
+double_int_fits_in_shwi_p (double_int cst)
+{
+  return cst.fits_signed ();
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline bool
+double_int_fits_in_hwi_p (double_int cst, bool uns)
+{
+  return cst.fits (uns);
 }
 
 /* The following operations perform arithmetics modulo 2^precision,
@@ -130,88 +334,258 @@ double_int_fits_in_uhwi_p (double_int cst)
    you are representing numbers with precision less than
    HOST_BITS_PER_DOUBLE_INT bits.  */
 
-double_int double_int_mul (double_int, double_int);
-double_int double_int_mul_with_sign (double_int, double_int, bool, int *);
-double_int double_int_add (double_int, double_int);
-double_int double_int_sub (double_int, double_int);
-double_int double_int_neg (double_int);
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_mul (double_int a, double_int b)
+{
+  return a * b;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_mul_with_sign (double_int a, double_int b,
+			  bool unsigned_p, int *overflow)
+{
+  return a.mul_with_sign (b, unsigned_p, overflow);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_add (double_int a, double_int b)
+{
+  return a + b;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_sub (double_int a, double_int b)
+{
+  return a - b;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_neg (double_int a)
+{
+  return -a;
+}
 
 /* You must ensure that double_int_ext is called on the operands
    of the following operations, if the precision of the numbers
    is less than HOST_BITS_PER_DOUBLE_INT bits.  */
-double_int double_int_div (double_int, double_int, bool, unsigned);
-double_int double_int_sdiv (double_int, double_int, unsigned);
-double_int double_int_udiv (double_int, double_int, unsigned);
-double_int double_int_mod (double_int, double_int, bool, unsigned);
-double_int double_int_smod (double_int, double_int, unsigned);
-double_int double_int_umod (double_int, double_int, unsigned);
-double_int double_int_divmod (double_int, double_int, bool, unsigned, double_int *);
-double_int double_int_sdivmod (double_int, double_int, unsigned, double_int *);
-double_int double_int_udivmod (double_int, double_int, unsigned, double_int *);
 
-bool double_int_multiple_of (double_int, double_int, bool, double_int *);
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_div (double_int a, double_int b, bool uns, unsigned code)
+{
+  return a.div (b, uns, code);
+}
 
-double_int double_int_setbit (double_int, unsigned);
-int double_int_ctz (double_int);
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_sdiv (double_int a, double_int b, unsigned code)
+{
+  return a.sdiv (b, code);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_udiv (double_int a, double_int b, unsigned code)
+{
+  return a.udiv (b, code);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_mod (double_int a, double_int b, bool uns, unsigned code)
+{
+  return a.mod (b, uns, code);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_smod (double_int a, double_int b, unsigned code)
+{
+  return a.smod (b, code);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_umod (double_int a, double_int b, unsigned code)
+{
+  return a.umod (b, code);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_divmod (double_int a, double_int b, bool uns,
+		   unsigned code, double_int *mod)
+{
+  return a.divmod (b, uns, code, mod);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_sdivmod (double_int a, double_int b, unsigned code, double_int *mod)
+{
+  return a.sdivmod (b, code, mod);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_udivmod (double_int a, double_int b, unsigned code, double_int *mod)
+{
+  return a.udivmod (b, code, mod);
+}
+
+/***/
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline bool
+double_int_multiple_of (double_int product, double_int factor,
+                        bool unsigned_p, double_int *multiple)
+{
+  return product.multiple_of (factor, unsigned_p, multiple);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_setbit (double_int a, unsigned bitpos)
+{
+  return a.set_bit (bitpos);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline int
+double_int_ctz (double_int a)
+{
+  return a.trailing_zeros ();
+}
 
 /* Logical operations.  */
 
 /* Returns ~A.  */
 
+inline double_int
+double_int::operator ~ () const
+{
+  double_int result;
+  result.low = ~low;
+  result.high = ~high;
+  return result;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline double_int
 double_int_not (double_int a)
 {
-  a.low = ~a.low;
-  a.high = ~a.high;
-  return a;
+  return ~a;
 }
 
 /* Returns A | B.  */
 
+inline double_int
+double_int::operator | (double_int b) const
+{
+  double_int result;
+  result.low = low | b.low;
+  result.high = high | b.high;
+  return result;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline double_int
 double_int_ior (double_int a, double_int b)
 {
-  a.low |= b.low;
-  a.high |= b.high;
-  return a;
+  return a | b;
 }
 
 /* Returns A & B.  */
 
+inline double_int
+double_int::operator & (double_int b) const
+{
+  double_int result;
+  result.low = low & b.low;
+  result.high = high & b.high;
+  return result;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline double_int
 double_int_and (double_int a, double_int b)
 {
-  a.low &= b.low;
-  a.high &= b.high;
-  return a;
+  return a & b;
 }
 
 /* Returns A & ~B.  */
 
+inline double_int
+double_int::and_not (double_int b) const
+{
+  double_int result;
+  result.low = low & ~b.low;
+  result.high = high & ~b.high;
+  return result;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline double_int
 double_int_and_not (double_int a, double_int b)
 {
-  a.low &= ~b.low;
-  a.high &= ~b.high;
-  return a;
+  return a.and_not (b);
 }
 
 /* Returns A ^ B.  */
 
+inline double_int
+double_int::operator ^ (double_int b) const
+{
+  double_int result;
+  result.low = low ^ b.low;
+  result.high = high ^ b.high;
+  return result;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline double_int
 double_int_xor (double_int a, double_int b)
 {
-  a.low ^= b.low;
-  a.high ^= b.high;
-  return a;
+  return a ^ b;
 }
 
 
 /* Shift operations.  */
-double_int double_int_lshift (double_int, HOST_WIDE_INT, unsigned int, bool);
-double_int double_int_rshift (double_int, HOST_WIDE_INT, unsigned int, bool);
-double_int double_int_lrotate (double_int, HOST_WIDE_INT, unsigned int);
-double_int double_int_rrotate (double_int, HOST_WIDE_INT, unsigned int);
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_lshift (double_int a, HOST_WIDE_INT count, unsigned int prec,
+		   bool arith)
+{
+  return a.lshift (count, prec, arith);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_rshift (double_int a, HOST_WIDE_INT count, unsigned int prec,
+		   bool arith)
+{
+  return a.rshift (count, prec, arith);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_lrotate (double_int a, HOST_WIDE_INT count, unsigned int prec)
+{
+  return a.lrotate (count, prec);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_rrotate (double_int a, HOST_WIDE_INT count, unsigned int prec)
+{
+  return a.rrotate (count, prec);
+}
 
 /* Returns true if CST is negative.  Of course, CST is considered to
    be signed.  */
@@ -222,29 +596,115 @@ double_int_negative_p (double_int cst)
   return cst.high < 0;
 }
 
-int double_int_cmp (double_int, double_int, bool);
-int double_int_scmp (double_int, double_int);
-int double_int_ucmp (double_int, double_int);
+/* FIXME(crowl): Remove after converting callers.  */
+inline int
+double_int_cmp (double_int a, double_int b, bool uns)
+{
+  return a.cmp (b, uns);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline int
+double_int_scmp (double_int a, double_int b)
+{
+  return a.scmp (b);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline int
+double_int_ucmp (double_int a, double_int b)
+{
+  return a.ucmp (b);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_max (double_int a, double_int b, bool uns)
+{
+  return a.max (b, uns);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_smax (double_int a, double_int b)
+{
+  return a.smax (b);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_umax (double_int a, double_int b)
+{
+  return a.umax (b);
+}
 
-double_int double_int_max (double_int, double_int, bool);
-double_int double_int_smax (double_int, double_int);
-double_int double_int_umax (double_int, double_int);
 
-double_int double_int_min (double_int, double_int, bool);
-double_int double_int_smin (double_int, double_int);
-double_int double_int_umin (double_int, double_int);
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_min (double_int a, double_int b, bool uns)
+{
+  return a.min (b, uns);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_smin (double_int a, double_int b)
+{
+  return a.smin (b);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_umin (double_int a, double_int b)
+{
+  return a.umin (b);
+}
 
 void dump_double_int (FILE *, double_int, bool);
 
 /* Zero and sign extension of numbers in smaller precisions.  */
 
-double_int double_int_ext (double_int, unsigned, bool);
-double_int double_int_sext (double_int, unsigned);
-double_int double_int_zext (double_int, unsigned);
-double_int double_int_mask (unsigned);
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_ext (double_int a, unsigned prec, bool uns)
+{ 
+  return a.ext (prec, uns);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_sext (double_int a, unsigned prec)
+{
+  return a.sext (prec);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_zext (double_int a, unsigned prec)
+{
+  return a.zext (prec);
+}
 
-double_int double_int_max_value (unsigned int, bool);
-double_int double_int_min_value (unsigned int, bool);
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_mask (unsigned prec)
+{
+  return double_int::mask (prec);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_max_value (unsigned int prec, bool uns)
+{
+  return double_int::max_value (prec, uns);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
+inline double_int
+double_int_min_value (unsigned int prec, bool uns)
+{
+  return double_int::min_value (prec, uns);
+}
 
 #define ALL_ONES (~((unsigned HOST_WIDE_INT) 0))
 
@@ -254,69 +714,128 @@ double_int double_int_min_value (unsigned int, bool);
 
 /* Returns true if CST is zero.  */
 
+inline bool
+double_int::is_zero () const
+{
+  return low == 0 && high == 0;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline bool
 double_int_zero_p (double_int cst)
 {
-  return cst.low == 0 && cst.high == 0;
+  return cst.is_zero ();
 }
 
 /* Returns true if CST is one.  */
 
+inline bool
+double_int::is_one () const
+{
+  return low == 1 && high == 0;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline bool
 double_int_one_p (double_int cst)
 {
-  return cst.low == 1 && cst.high == 0;
+  return cst.is_one ();
 }
 
 /* Returns true if CST is minus one.  */
 
+inline bool
+double_int::is_minus_one () const
+{
+  return low == ALL_ONES && high == -1;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline bool
 double_int_minus_one_p (double_int cst)
 {
-  return (cst.low == ALL_ONES && cst.high == -1);
+  return cst.is_minus_one ();
+}
+
+/* Returns true if CST is negative.  */
+
+inline bool
+double_int::is_negative () const
+{
+  return high < 0;
 }
 
 /* Returns true if CST1 == CST2.  */
 
+inline bool
+double_int::operator == (double_int cst2) const
+{
+  return low == cst2.low && high == cst2.high;
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline bool
 double_int_equal_p (double_int cst1, double_int cst2)
 {
-  return cst1.low == cst2.low && cst1.high == cst2.high;
+  return cst1 == cst2;
+}
+
+/* Returns true if CST1 != CST2.  */
+
+inline bool
+double_int::operator != (double_int cst2) const
+{
+  return low != cst2.low || high != cst2.high;
 }
 
 /* Return number of set bits of CST.  */
 
+inline int
+double_int::popcount () const
+{
+  return popcount_hwi (high) + popcount_hwi (low);
+}
+
+/* FIXME(crowl): Remove after converting callers.  */
 static inline int
 double_int_popcount (double_int cst)
 {
-  return popcount_hwi (cst.high) + popcount_hwi (cst.low);
+  return cst.popcount ();
 }
 
 
 /* Legacy interface with decomposed high/low parts.  */
 
+/* FIXME(crowl): Remove after converting callers.  */
 extern int add_double_with_sign (unsigned HOST_WIDE_INT, HOST_WIDE_INT,
 				 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
 				 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *,
 				 bool);
+/* FIXME(crowl): Remove after converting callers.  */
 #define add_double(l1,h1,l2,h2,lv,hv) \
   add_double_with_sign (l1, h1, l2, h2, lv, hv, false)
+/* FIXME(crowl): Remove after converting callers.  */
 extern int neg_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT,
 		       unsigned HOST_WIDE_INT *, HOST_WIDE_INT *);
+/* FIXME(crowl): Remove after converting callers.  */
 extern int mul_double_with_sign (unsigned HOST_WIDE_INT, HOST_WIDE_INT,
 				 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
 				 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *,
 				 bool);
+/* FIXME(crowl): Remove after converting callers.  */
 extern int mul_double_wide_with_sign (unsigned HOST_WIDE_INT, HOST_WIDE_INT,
 				      unsigned HOST_WIDE_INT, HOST_WIDE_INT,
 				      unsigned HOST_WIDE_INT *, HOST_WIDE_INT *,
 				      unsigned HOST_WIDE_INT *, HOST_WIDE_INT *,
 				      bool);
+/* FIXME(crowl): Remove after converting callers.  */
 #define mul_double(l1,h1,l2,h2,lv,hv) \
   mul_double_with_sign (l1, h1, l2, h2, lv, hv, false)
+/* FIXME(crowl): Remove after converting callers.  */
 extern void lshift_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT,
 			   HOST_WIDE_INT, unsigned int,
 			   unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, bool);
+/* FIXME(crowl): Remove after converting callers.  */
 extern int div_and_round_double (unsigned, int, unsigned HOST_WIDE_INT,
 				 HOST_WIDE_INT, unsigned HOST_WIDE_INT,
 				 HOST_WIDE_INT, unsigned HOST_WIDE_INT *,
diff --git a/gcc/fixed-value.c b/gcc/fixed-value.c
index 97aa8b5..9a34bc5 100644
--- a/gcc/fixed-value.c
+++ b/gcc/fixed-value.c
@@ -111,13 +111,11 @@ fixed_from_string (FIXED_VALUE_TYPE *f, const char *str, enum machine_mode mode)
       /* From the spec, we need to evaluate 1 to the maximal value.  */
       f->data.low = -1;
       f->data.high = -1;
-      f->data = double_int_ext (f->data,
-				GET_MODE_FBIT (f->mode)
-				+ GET_MODE_IBIT (f->mode), 1);
+      f->data = f->data.zext (GET_MODE_FBIT (f->mode)
+				+ GET_MODE_IBIT (f->mode));
     }
   else
-    f->data = double_int_ext (f->data,
-			      SIGNED_FIXED_POINT_MODE_P (f->mode)
+    f->data = f->data.ext (SIGNED_FIXED_POINT_MODE_P (f->mode)
 			      + GET_MODE_FBIT (f->mode)
 			      + GET_MODE_IBIT (f->mode),
 			      UNSIGNED_FIXED_POINT_MODE_P (f->mode));
@@ -159,8 +157,8 @@ fixed_saturate1 (enum machine_mode mode, double_int a, double_int *f,
       double_int max;
       max.low = -1;
       max.high = -1;
-      max = double_int_ext (max, i_f_bits, 1);
-      if (double_int_cmp (a, max, 1) == 1)
+      max = max.zext (i_f_bits);
+      if (a.ugt (max))
 	{
 	  if (sat_p)
 	    *f = max;
@@ -173,21 +171,19 @@ fixed_saturate1 (enum machine_mode mode, double_int a, double_int *f,
       double_int max, min;
       max.high = -1;
       max.low = -1;
-      max = double_int_ext (max, i_f_bits, 1);
+      max = max.zext (i_f_bits);
       min.high = 0;
       min.low = 1;
-      lshift_double (min.low, min.high, i_f_bits,
-		     HOST_BITS_PER_DOUBLE_INT,
-		     &min.low, &min.high, 1);
-      min = double_int_ext (min, 1 + i_f_bits, 0);
-      if (double_int_cmp (a, max, 0) == 1)
+      min = min.alshift (i_f_bits, HOST_BITS_PER_DOUBLE_INT);
+      min = min.sext (1 + i_f_bits);
+      if (a.sgt (max))
 	{
 	  if (sat_p)
 	    *f = max;
 	  else
 	    overflow_p = true;
 	}
-      else if (double_int_cmp (a, min, 0) == -1)
+      else if (a.slt (min))
 	{
 	  if (sat_p)
 	    *f = min;
@@ -221,10 +217,10 @@ fixed_saturate2 (enum machine_mode mode, double_int a_high, double_int a_low,
       max_r.low = 0;
       max_s.high = -1;
       max_s.low = -1;
-      max_s = double_int_ext (max_s, i_f_bits, 1);
-      if (double_int_cmp (a_high, max_r, 1) == 1
-	  || (double_int_equal_p (a_high, max_r) &&
-	      double_int_cmp (a_low, max_s, 1) == 1))
+      max_s = max_s.zext (i_f_bits);
+      if (a_high.ugt (max_r)
+	  || (a_high == max_r &&
+	      a_low.ugt (max_s)))
 	{
 	  if (sat_p)
 	    *f = max_s;
@@ -239,27 +235,25 @@ fixed_saturate2 (enum machine_mode mode, double_int a_high, double_int a_low,
       max_r.low = 0;
       max_s.high = -1;
       max_s.low = -1;
-      max_s = double_int_ext (max_s, i_f_bits, 1);
+      max_s = max_s.zext (i_f_bits);
       min_r.high = -1;
       min_r.low = -1;
       min_s.high = 0;
       min_s.low = 1;
-      lshift_double (min_s.low, min_s.high, i_f_bits,
-		     HOST_BITS_PER_DOUBLE_INT,
-		     &min_s.low, &min_s.high, 1);
-      min_s = double_int_ext (min_s, 1 + i_f_bits, 0);
-      if (double_int_cmp (a_high, max_r, 0) == 1
-	  || (double_int_equal_p (a_high, max_r) &&
-	      double_int_cmp (a_low, max_s, 1) == 1))
+      min_s = min_s.alshift (i_f_bits, HOST_BITS_PER_DOUBLE_INT);
+      min_s = min_s.sext (1 + i_f_bits);
+      if (a_high.sgt (max_r)
+	  || (a_high == max_r &&
+	      a_low.ugt (max_s)))
 	{
 	  if (sat_p)
 	    *f = max_s;
 	  else
 	    overflow_p = true;
 	}
-      else if (double_int_cmp (a_high, min_r, 0) == -1
-	       || (double_int_equal_p (a_high, min_r) &&
-		   double_int_cmp (a_low, min_s, 1) == -1))
+      else if (a_high.slt (min_r)
+	       || (a_high == min_r &&
+		   a_low.ult (min_s)))
 	{
 	  if (sat_p)
 	    *f = min_s;
@@ -297,19 +291,19 @@ do_fixed_add (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
   /* This was a conditional expression but it triggered a bug in
      Sun C 5.5.  */
   if (subtract_p)
-    temp = double_int_neg (b->data);
+    temp = -b->data;
   else
     temp = b->data;
 
   unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (a->mode);
   i_f_bits = GET_MODE_IBIT (a->mode) + GET_MODE_FBIT (a->mode);
   f->mode = a->mode;
-  f->data = double_int_add (a->data, temp);
+  f->data = a->data + temp;
   if (unsigned_p) /* Unsigned type.  */
     {
       if (subtract_p) /* Unsigned subtraction.  */
 	{
-	  if (double_int_cmp (a->data, b->data, 1) == -1)
+	  if (a->data.ult (b->data))
 	    {
 	      if (sat_p)
 		{
@@ -322,9 +316,9 @@ do_fixed_add (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
 	}
       else /* Unsigned addition.  */
 	{
-	  f->data = double_int_ext (f->data, i_f_bits, 1);
-	  if (double_int_cmp (f->data, a->data, 1) == -1
-	      || double_int_cmp (f->data, b->data, 1) == -1)
+	  f->data = f->data.zext (i_f_bits);
+	  if (f->data.ult (a->data)
+	      || f->data.ult (b->data))
 	    {
 	      if (sat_p)
 		{
@@ -353,22 +347,17 @@ do_fixed_add (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
 	    {
 	      f->data.low = 1;
 	      f->data.high = 0;
-	      lshift_double (f->data.low, f->data.high, i_f_bits,
-			     HOST_BITS_PER_DOUBLE_INT,
-			     &f->data.low, &f->data.high, 1);
+	      f->data = f->data.alshift (i_f_bits, HOST_BITS_PER_DOUBLE_INT);
 	      if (get_fixed_sign_bit (a->data, i_f_bits) == 0)
 		{
-		  double_int one;
-		  one.low = 1;
-		  one.high = 0;
-		  f->data = double_int_sub (f->data, one);
+		  --f->data;
 		}
 	    }
 	  else
 	    overflow_p = true;
 	}
     }
-  f->data = double_int_ext (f->data, (!unsigned_p) + i_f_bits, unsigned_p);
+  f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p);
   return overflow_p;
 }
 
@@ -386,11 +375,10 @@ do_fixed_multiply (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
   f->mode = a->mode;
   if (GET_MODE_PRECISION (f->mode) <= HOST_BITS_PER_WIDE_INT)
     {
-      f->data = double_int_mul (a->data, b->data);
-      lshift_double (f->data.low, f->data.high,
-		     (-GET_MODE_FBIT (f->mode)),
+      f->data = a->data * b->data;
+      f->data = f->data.lshift ((-GET_MODE_FBIT (f->mode)),
 		     HOST_BITS_PER_DOUBLE_INT,
-		     &f->data.low, &f->data.high, !unsigned_p);
+		     !unsigned_p);
       overflow_p = fixed_saturate1 (f->mode, f->data, &f->data, sat_p);
     }
   else
@@ -412,43 +400,43 @@ do_fixed_multiply (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
       b_low.high = 0;
 
       /* Perform four multiplications.  */
-      low_low = double_int_mul (a_low, b_low);
-      low_high = double_int_mul (a_low, b_high);
-      high_low = double_int_mul (a_high, b_low);
-      high_high = double_int_mul (a_high, b_high);
+      low_low = a_low * b_low;
+      low_high = a_low * b_high;
+      high_low = a_high * b_low;
+      high_high = a_high * b_high;
 
       /* Accumulate four results to {r, s}.  */
       temp1.high = high_low.low;
       temp1.low = 0;
-      s = double_int_add (low_low, temp1);
-      if (double_int_cmp (s, low_low, 1) == -1
-	  || double_int_cmp (s, temp1, 1) == -1)
+      s = low_low + temp1;
+      if (s.ult (low_low)
+	  || s.ult (temp1))
 	carry ++; /* Carry */
       temp1.high = s.high;
       temp1.low = s.low;
       temp2.high = low_high.low;
       temp2.low = 0;
-      s = double_int_add (temp1, temp2);
-      if (double_int_cmp (s, temp1, 1) == -1
-	  || double_int_cmp (s, temp2, 1) == -1)
+      s = temp1 + temp2;
+      if (s.ult (temp1)
+	  || s.ult (temp2))
 	carry ++; /* Carry */
 
       temp1.low = high_low.high;
       temp1.high = 0;
-      r = double_int_add (high_high, temp1);
+      r = high_high + temp1;
       temp1.low = low_high.high;
       temp1.high = 0;
-      r = double_int_add (r, temp1);
+      r += temp1;
       temp1.low = carry;
       temp1.high = 0;
-      r = double_int_add (r, temp1);
+      r += temp1;
 
       /* We need to subtract b from r, if a < 0.  */
       if (!unsigned_p && a->data.high < 0)
-	r = double_int_sub (r, b->data);
+	r -= b->data;
       /* We need to subtract a from r, if b < 0.  */
       if (!unsigned_p && b->data.high < 0)
-	r = double_int_sub (r, a->data);
+	r -= a->data;
 
       /* Shift right the result by FBIT.  */
       if (GET_MODE_FBIT (f->mode) == HOST_BITS_PER_DOUBLE_INT)
@@ -470,29 +458,23 @@ do_fixed_multiply (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
 	}
       else
 	{
-	  lshift_double (s.low, s.high,
-			 (-GET_MODE_FBIT (f->mode)),
-			 HOST_BITS_PER_DOUBLE_INT,
-			 &s.low, &s.high, 0);
-	  lshift_double (r.low, r.high,
-			 (HOST_BITS_PER_DOUBLE_INT
+	  s = s.llshift ((-GET_MODE_FBIT (f->mode)), HOST_BITS_PER_DOUBLE_INT);
+	  f->data = r.llshift ((HOST_BITS_PER_DOUBLE_INT
 			  - GET_MODE_FBIT (f->mode)),
-			 HOST_BITS_PER_DOUBLE_INT,
-			 &f->data.low, &f->data.high, 0);
+			 HOST_BITS_PER_DOUBLE_INT);
 	  f->data.low = f->data.low | s.low;
 	  f->data.high = f->data.high | s.high;
 	  s.low = f->data.low;
 	  s.high = f->data.high;
-	  lshift_double (r.low, r.high,
-			 (-GET_MODE_FBIT (f->mode)),
+	  r = r.lshift ((-GET_MODE_FBIT (f->mode)),
 			 HOST_BITS_PER_DOUBLE_INT,
-			 &r.low, &r.high, !unsigned_p);
+			 !unsigned_p);
 	}
 
       overflow_p = fixed_saturate2 (f->mode, r, s, &f->data, sat_p);
     }
 
-  f->data = double_int_ext (f->data, (!unsigned_p) + i_f_bits, unsigned_p);
+  f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p);
   return overflow_p;
 }
 
@@ -510,11 +492,10 @@ do_fixed_divide (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
   f->mode = a->mode;
   if (GET_MODE_PRECISION (f->mode) <= HOST_BITS_PER_WIDE_INT)
     {
-      lshift_double (a->data.low, a->data.high,
-		     GET_MODE_FBIT (f->mode),
+      f->data = a->data.lshift (GET_MODE_FBIT (f->mode),
 		     HOST_BITS_PER_DOUBLE_INT,
-		     &f->data.low, &f->data.high, !unsigned_p);
-      f->data = double_int_div (f->data, b->data, unsigned_p, TRUNC_DIV_EXPR);
+		     !unsigned_p);
+      f->data = f->data.div (b->data, unsigned_p, TRUNC_DIV_EXPR);
       overflow_p = fixed_saturate1 (f->mode, f->data, &f->data, sat_p);
     }
   else
@@ -527,7 +508,7 @@ do_fixed_divide (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
       /* If a < 0, negate a.  */
       if (!unsigned_p && a->data.high < 0)
 	{
-	  pos_a = double_int_neg (a->data);
+	  pos_a = -a->data;
 	  num_of_neg ++;
 	}
       else
@@ -536,7 +517,7 @@ do_fixed_divide (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
       /* If b < 0, negate b.  */
       if (!unsigned_p && b->data.high < 0)
 	{
-	  pos_b = double_int_neg (b->data);
+	  pos_b = -b->data;
 	  num_of_neg ++;
 	}
       else
@@ -551,24 +532,15 @@ do_fixed_divide (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
 	}
       else
  	{
-	  lshift_double (pos_a.low, pos_a.high,
-			 GET_MODE_FBIT (f->mode),
-			 HOST_BITS_PER_DOUBLE_INT,
-			 &s.low, &s.high, 0);
-	  lshift_double (pos_a.low, pos_a.high,
-			 - (HOST_BITS_PER_DOUBLE_INT
+	  s = pos_a.llshift (GET_MODE_FBIT (f->mode), HOST_BITS_PER_DOUBLE_INT);
+	  r = pos_a.llshift (- (HOST_BITS_PER_DOUBLE_INT
 			    - GET_MODE_FBIT (f->mode)),
-			 HOST_BITS_PER_DOUBLE_INT,
-			 &r.low, &r.high, 0);
+			 HOST_BITS_PER_DOUBLE_INT);
  	}
 
       /* Divide r by pos_b to quo_r.  The remainder is in mod.  */
-      div_and_round_double (TRUNC_DIV_EXPR, 1, r.low, r.high, pos_b.low,
-			    pos_b.high, &quo_r.low, &quo_r.high, &mod.low,
-			    &mod.high);
-
-      quo_s.high = 0;
-      quo_s.low = 0;
+      quo_r = r.divmod (pos_b, 1, TRUNC_DIV_EXPR, &mod);
+      quo_s = double_int_zero;
 
       for (i = 0; i < HOST_BITS_PER_DOUBLE_INT; i++)
 	{
@@ -576,37 +548,34 @@ do_fixed_divide (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
 	  int leftmost_mod = (mod.high < 0);
 
 	  /* Shift left mod by 1 bit.  */
-	  lshift_double (mod.low, mod.high, 1, HOST_BITS_PER_DOUBLE_INT,
-			 &mod.low, &mod.high, 0);
+	  mod = mod.llshift (1, HOST_BITS_PER_DOUBLE_INT);
 
 	  /* Test the leftmost bit of s to add to mod.  */
 	  if (s.high < 0)
 	    mod.low += 1;
 
 	  /* Shift left quo_s by 1 bit.  */
-	  lshift_double (quo_s.low, quo_s.high, 1, HOST_BITS_PER_DOUBLE_INT,
-			 &quo_s.low, &quo_s.high, 0);
+	  quo_s = quo_s.llshift (1, HOST_BITS_PER_DOUBLE_INT);
 
 	  /* Try to calculate (mod - pos_b).  */
-	  temp = double_int_sub (mod, pos_b);
+	  temp = mod - pos_b;
 
-	  if (leftmost_mod == 1 || double_int_cmp (mod, pos_b, 1) != -1)
+	  if (leftmost_mod == 1 || mod.ucmp (pos_b) != -1)
 	    {
 	      quo_s.low += 1;
 	      mod = temp;
 	    }
 
 	  /* Shift left s by 1 bit.  */
-	  lshift_double (s.low, s.high, 1, HOST_BITS_PER_DOUBLE_INT,
-			 &s.low, &s.high, 0);
+	  s = s.llshift (1, HOST_BITS_PER_DOUBLE_INT);
 
 	}
 
       if (num_of_neg == 1)
 	{
-	  quo_s = double_int_neg (quo_s);
+	  quo_s = -quo_s;
 	  if (quo_s.high == 0 && quo_s.low == 0)
-	    quo_r = double_int_neg (quo_r);
+	    quo_r = -quo_r;
 	  else
 	    {
 	      quo_r.low = ~quo_r.low;
@@ -618,7 +587,7 @@ do_fixed_divide (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
       overflow_p = fixed_saturate2 (f->mode, quo_r, quo_s, &f->data, sat_p);
     }
 
-  f->data = double_int_ext (f->data, (!unsigned_p) + i_f_bits, unsigned_p);
+  f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p);
   return overflow_p;
 }
 
@@ -643,10 +612,9 @@ do_fixed_shift (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
 
   if (GET_MODE_PRECISION (f->mode) <= HOST_BITS_PER_WIDE_INT || (!left_p))
     {
-      lshift_double (a->data.low, a->data.high,
-		     left_p ? b->data.low : (-b->data.low),
+      f->data = a->data.lshift (left_p ? b->data.low : (-b->data.low),
 		     HOST_BITS_PER_DOUBLE_INT,
-		     &f->data.low, &f->data.high, !unsigned_p);
+		     !unsigned_p);
       if (left_p) /* Only left shift saturates.  */
 	overflow_p = fixed_saturate1 (f->mode, f->data, &f->data, sat_p);
     }
@@ -661,23 +629,20 @@ do_fixed_shift (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a,
 	}
       else
 	{
-	  lshift_double (a->data.low, a->data.high,
-			 b->data.low,
+	  temp_low = a->data.lshift (b->data.low,
 			 HOST_BITS_PER_DOUBLE_INT,
-			 &temp_low.low, &temp_low.high, !unsigned_p);
+			 !unsigned_p);
 	  /* Logical shift right to temp_high.  */
-	  lshift_double (a->data.low, a->data.high,
-			 b->data.low - HOST_BITS_PER_DOUBLE_INT,
-			 HOST_BITS_PER_DOUBLE_INT,
-			 &temp_high.low, &temp_high.high, 0);
+	  temp_high = a->data.llshift (b->data.low - HOST_BITS_PER_DOUBLE_INT,
+			 HOST_BITS_PER_DOUBLE_INT);
 	}
       if (!unsigned_p && a->data.high < 0) /* Signed-extend temp_high.  */
-	temp_high = double_int_ext (temp_high, b->data.low, unsigned_p);
+	temp_high = temp_high.ext (b->data.low, unsigned_p);
       f->data = temp_low;
       overflow_p = fixed_saturate2 (f->mode, temp_high, temp_low, &f->data,
 				    sat_p);
     }
-  f->data = double_int_ext (f->data, (!unsigned_p) + i_f_bits, unsigned_p);
+  f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p);
   return overflow_p;
 }
 
@@ -692,8 +657,8 @@ do_fixed_neg (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a, bool sat_p)
   bool unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (a->mode);
   int i_f_bits = GET_MODE_IBIT (a->mode) + GET_MODE_FBIT (a->mode);
   f->mode = a->mode;
-  f->data = double_int_neg (a->data);
-  f->data = double_int_ext (f->data, (!unsigned_p) + i_f_bits, unsigned_p);
+  f->data = -a->data;
+  f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p);
 
   if (unsigned_p) /* Unsigned type.  */
     {
@@ -718,7 +683,7 @@ do_fixed_neg (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a, bool sat_p)
 	      /* Saturate to the maximum by subtracting f->data by one.  */
 	      f->data.low = -1;
 	      f->data.high = -1;
-	      f->data = double_int_ext (f->data, i_f_bits, 1);
+	      f->data = f->data.zext (i_f_bits);
 	    }
 	  else
 	    overflow_p = true;
@@ -789,25 +754,25 @@ fixed_compare (int icode, const FIXED_VALUE_TYPE *op0,
   switch (code)
     {
     case NE_EXPR:
-      return !double_int_equal_p (op0->data, op1->data);
+      return op0->data != op1->data;
 
     case EQ_EXPR:
-      return double_int_equal_p (op0->data, op1->data);
+      return op0->data == op1->data;
 
     case LT_EXPR:
-      return double_int_cmp (op0->data, op1->data,
+      return op0->data.cmp (op1->data,
 			     UNSIGNED_FIXED_POINT_MODE_P (op0->mode)) == -1;
 
     case LE_EXPR:
-      return double_int_cmp (op0->data, op1->data,
+      return op0->data.cmp (op1->data,
 			     UNSIGNED_FIXED_POINT_MODE_P (op0->mode)) != 1;
 
     case GT_EXPR:
-      return double_int_cmp (op0->data, op1->data,
+      return op0->data.cmp (op1->data,
 			     UNSIGNED_FIXED_POINT_MODE_P (op0->mode)) == 1;
 
     case GE_EXPR:
-      return double_int_cmp (op0->data, op1->data,
+      return op0->data.cmp (op1->data,
 			     UNSIGNED_FIXED_POINT_MODE_P (op0->mode)) != -1;
 
     default:
@@ -835,19 +800,15 @@ fixed_convert (FIXED_VALUE_TYPE *f, enum machine_mode mode,
       /* Left shift a to temp_high, temp_low based on a->mode.  */
       double_int temp_high, temp_low;
       int amount = GET_MODE_FBIT (mode) - GET_MODE_FBIT (a->mode);
-      lshift_double (a->data.low, a->data.high,
-		     amount,
+      temp_low = a->data.lshift (amount,
 		     HOST_BITS_PER_DOUBLE_INT,
-		     &temp_low.low, &temp_low.high,
 		     SIGNED_FIXED_POINT_MODE_P (a->mode));
       /* Logical shift right to temp_high.  */
-      lshift_double (a->data.low, a->data.high,
-		     amount - HOST_BITS_PER_DOUBLE_INT,
-		     HOST_BITS_PER_DOUBLE_INT,
-		     &temp_high.low, &temp_high.high, 0);
+      temp_high = a->data.llshift (amount - HOST_BITS_PER_DOUBLE_INT,
+		     HOST_BITS_PER_DOUBLE_INT);
       if (SIGNED_FIXED_POINT_MODE_P (a->mode)
 	  && a->data.high < 0) /* Signed-extend temp_high.  */
-	temp_high = double_int_ext (temp_high, amount, 0);
+	temp_high = temp_high.sext (amount);
       f->mode = mode;
       f->data = temp_low;
       if (SIGNED_FIXED_POINT_MODE_P (a->mode) ==
@@ -885,10 +846,9 @@ fixed_convert (FIXED_VALUE_TYPE *f, enum machine_mode mode,
 		      /* Set to maximum.  */
 		      f->data.low = -1;  /* Set to all ones.  */
 		      f->data.high = -1;  /* Set to all ones.  */
-		      f->data = double_int_ext (f->data,
-						GET_MODE_FBIT (f->mode)
-						+ GET_MODE_IBIT (f->mode),
-						1); /* Clear the sign.  */
+		      f->data = f->data.zext (GET_MODE_FBIT (f->mode)
+						+ GET_MODE_IBIT (f->mode));
+						/* Clear the sign.  */
 		    }
 		  else
 		    overflow_p = true;
@@ -903,10 +863,8 @@ fixed_convert (FIXED_VALUE_TYPE *f, enum machine_mode mode,
     {
       /* Right shift a to temp based on a->mode.  */
       double_int temp;
-      lshift_double (a->data.low, a->data.high,
-		     GET_MODE_FBIT (mode) - GET_MODE_FBIT (a->mode),
+      temp = a->data.lshift (GET_MODE_FBIT (mode) - GET_MODE_FBIT (a->mode),
 		     HOST_BITS_PER_DOUBLE_INT,
-		     &temp.low, &temp.high,
 		     SIGNED_FIXED_POINT_MODE_P (a->mode));
       f->mode = mode;
       f->data = temp;
@@ -944,10 +902,9 @@ fixed_convert (FIXED_VALUE_TYPE *f, enum machine_mode mode,
 		      /* Set to maximum.  */
 		      f->data.low = -1;  /* Set to all ones.  */
 		      f->data.high = -1;  /* Set to all ones.  */
-		      f->data = double_int_ext (f->data,
-						GET_MODE_FBIT (f->mode)
-						+ GET_MODE_IBIT (f->mode),
-						1); /* Clear the sign.  */
+		      f->data = f->data.zext (GET_MODE_FBIT (f->mode)
+						+ GET_MODE_IBIT (f->mode));
+						/* Clear the sign.  */
 		    }
 		  else
 		    overflow_p = true;
@@ -959,8 +916,7 @@ fixed_convert (FIXED_VALUE_TYPE *f, enum machine_mode mode,
 	}
     }
 
-  f->data = double_int_ext (f->data,
-			    SIGNED_FIXED_POINT_MODE_P (f->mode)
+  f->data = f->data.ext (SIGNED_FIXED_POINT_MODE_P (f->mode)
 			    + GET_MODE_FBIT (f->mode)
 			    + GET_MODE_IBIT (f->mode),
 			    UNSIGNED_FIXED_POINT_MODE_P (f->mode));
@@ -988,19 +944,14 @@ fixed_convert_from_int (FIXED_VALUE_TYPE *f, enum machine_mode mode,
     }
   else
     {
-      lshift_double (a.low, a.high,
-		     amount,
-		     HOST_BITS_PER_DOUBLE_INT,
-		     &temp_low.low, &temp_low.high, 0);
+      temp_low = a.llshift (amount, HOST_BITS_PER_DOUBLE_INT);
 
       /* Logical shift right to temp_high.  */
-      lshift_double (a.low, a.high,
-		     amount - HOST_BITS_PER_DOUBLE_INT,
-		     HOST_BITS_PER_DOUBLE_INT,
-		     &temp_high.low, &temp_high.high, 0);
+      temp_high = a.llshift (amount - HOST_BITS_PER_DOUBLE_INT,
+		     HOST_BITS_PER_DOUBLE_INT);
     }
   if (!unsigned_p && a.high < 0) /* Signed-extend temp_high.  */
-    temp_high = double_int_ext (temp_high, amount, 0);
+    temp_high = temp_high.sext (amount);
 
   f->mode = mode;
   f->data = temp_low;
@@ -1038,10 +989,9 @@ fixed_convert_from_int (FIXED_VALUE_TYPE *f, enum machine_mode mode,
 		  /* Set to maximum.  */
 		  f->data.low = -1;  /* Set to all ones.  */
 		  f->data.high = -1;  /* Set to all ones.  */
-		  f->data = double_int_ext (f->data,
-					    GET_MODE_FBIT (f->mode)
-					    + GET_MODE_IBIT (f->mode),
-					    1); /* Clear the sign.  */
+		  f->data = f->data.zext (GET_MODE_FBIT (f->mode)
+					    + GET_MODE_IBIT (f->mode));
+					    /* Clear the sign.  */
 		}
 	      else
 		overflow_p = true;
@@ -1051,8 +1001,7 @@ fixed_convert_from_int (FIXED_VALUE_TYPE *f, enum machine_mode mode,
 					  &f->data, sat_p);
 	}
     }
-  f->data = double_int_ext (f->data,
-			    SIGNED_FIXED_POINT_MODE_P (f->mode)
+  f->data = f->data.ext (SIGNED_FIXED_POINT_MODE_P (f->mode)
 			    + GET_MODE_FBIT (f->mode)
 			    + GET_MODE_IBIT (f->mode),
 			    UNSIGNED_FIXED_POINT_MODE_P (f->mode));
@@ -1093,10 +1042,8 @@ fixed_convert_from_real (FIXED_VALUE_TYPE *f, enum machine_mode mode,
 	    {
 	      f->data.low = 1;
 	      f->data.high = 0;
-	      lshift_double (f->data.low, f->data.high, i_f_bits,
-			     HOST_BITS_PER_DOUBLE_INT,
-			     &f->data.low, &f->data.high, 1);
-	      f->data = double_int_ext (f->data, 1 + i_f_bits, 0);
+	      f->data = f->data.alshift (i_f_bits, HOST_BITS_PER_DOUBLE_INT);
+	      f->data = f->data.sext (1 + i_f_bits);
 	    }
 	}
       else
@@ -1108,12 +1055,12 @@ fixed_convert_from_real (FIXED_VALUE_TYPE *f, enum machine_mode mode,
 	{
 	  f->data.low = -1;
 	  f->data.high = -1;
-	  f->data = double_int_ext (f->data, i_f_bits, 1);
+	  f->data = f->data.zext (i_f_bits);
 	}
       else
 	overflow_p = true;
     }
-  f->data = double_int_ext (f->data, (!unsigned_p) + i_f_bits, unsigned_p);
+  f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p);
   return overflow_p;
 }
 


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