PATCH: middle-end changes for decimal float support
Ben Elliston
bje@au1.ibm.com
Fri Dec 16 12:39:00 GMT 2005
Ian Taylor has already taken a preliminary look at these patches, but
I am posting them here again for public approval. Due to Paolo
Bonzini's overhaul of simplify-rtx.c, I have had to refresh this patch
and re-test it (bootstrap and regression tested on powerpc-linux).
Okay for the trunk?
2005-12-17 Jon Grimm <jgrimm2@us.ibm.com>
Janis Johnson <janis187@us.ibm.com>
Ben Elliston <bje@au.ibm.com>
* optabs.c (init_floating_libfuncs): Handle decimal float modes.
(init_optabs): Handle libfuncs for decimal float.
* genopinit.c (gen_insn): Handle MODE_DECIMAL_FLOAT.
* stor-layout.c (int_mode_for_mode): Likewise.
* simplify-rtx.c (simplify_immed_subreg): Likewise.
(simplify_unary_operation_1): Skip optimisations for decimal float
modes.
* varasm.c (output_constant_pool_2): Handle MODE_DECIMAL_FLOAT.
* emit-rtl.c (gen_const_vector): Add assertion check.
(init_emit_once): Populate const_tiny_rtx with constants in each
decimal float mode.
* expmed.c (extract_high_half, expand_mult_highpart_optab,
expand_mult_highpart): Assert that mode is not a scalar float
mode.
* expr.c (convert_move): Handle conversion between decimal and
binary floats of the same size.
* convert.c (convert_to_real): Consider decimal float types when
folding.
* dwarf2out.c (base_type_die): Use DW_ATE_decimal_float to
describe decimal floating point types.
Index: dwarf2out.c
===================================================================
--- dwarf2out.c (revision 108635)
+++ dwarf2out.c (working copy)
@@ -8124,7 +8124,10 @@
break;
case REAL_TYPE:
- encoding = DW_ATE_float;
+ if (DECIMAL_FLOAT_MODE_P (TYPE_MODE (type)))
+ encoding = DW_ATE_decimal_float;
+ else
+ encoding = DW_ATE_float;
break;
/* Dwarf2 doesn't know anything about complex ints, so use
Index: expr.c
===================================================================
--- expr.c (revision 108635)
+++ expr.c (working copy)
@@ -410,10 +410,15 @@
rtx value, insns;
convert_optab tab;
- gcc_assert (GET_MODE_PRECISION (from_mode)
- != GET_MODE_PRECISION (to_mode));
+ gcc_assert ((GET_MODE_PRECISION (from_mode)
+ != GET_MODE_PRECISION (to_mode))
+ || (DECIMAL_FLOAT_MODE_P (from_mode)
+ != DECIMAL_FLOAT_MODE_P (to_mode)));
- if (GET_MODE_PRECISION (from_mode) < GET_MODE_PRECISION (to_mode))
+ if (GET_MODE_PRECISION (from_mode) == GET_MODE_PRECISION (to_mode))
+ /* Conversion between decimal float and binary float, same size. */
+ tab = DECIMAL_FLOAT_MODE_P (from_mode) ? trunc_optab : sext_optab;
+ else if (GET_MODE_PRECISION (from_mode) < GET_MODE_PRECISION (to_mode))
tab = sext_optab;
else
tab = trunc_optab;
Index: stor-layout.c
===================================================================
--- stor-layout.c (revision 108635)
+++ stor-layout.c (working copy)
@@ -232,6 +232,7 @@
case MODE_COMPLEX_INT:
case MODE_COMPLEX_FLOAT:
case MODE_FLOAT:
+ case MODE_DECIMAL_FLOAT:
case MODE_VECTOR_INT:
case MODE_VECTOR_FLOAT:
mode = mode_for_size (GET_MODE_BITSIZE (mode), MODE_INT, 0);
Index: expmed.c
===================================================================
--- expmed.c (revision 108635)
+++ expmed.c (working copy)
@@ -3383,6 +3383,8 @@
if (mode == word_mode)
return gen_highpart (mode, op);
+ gcc_assert (!SCALAR_FLOAT_MODE_P (mode));
+
wider_mode = GET_MODE_WIDER_MODE (mode);
op = expand_shift (RSHIFT_EXPR, wider_mode, op,
build_int_cst (NULL_TREE, GET_MODE_BITSIZE (mode)), 0, 1);
@@ -3402,6 +3404,8 @@
rtx tem;
int size;
+ gcc_assert (!SCALAR_FLOAT_MODE_P (mode));
+
wider_mode = GET_MODE_WIDER_MODE (mode);
size = GET_MODE_BITSIZE (mode);
@@ -3512,6 +3516,7 @@
struct algorithm alg;
rtx tem;
+ gcc_assert (!SCALAR_FLOAT_MODE_P (mode));
/* We can't support modes wider than HOST_BITS_PER_INT. */
gcc_assert (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT);
Index: emit-rtl.c
===================================================================
--- emit-rtl.c (revision 108635)
+++ emit-rtl.c (working copy)
@@ -5151,6 +5151,8 @@
units = GET_MODE_NUNITS (mode);
inner = GET_MODE_INNER (mode);
+ gcc_assert (!DECIMAL_FLOAT_MODE_P (inner));
+
v = rtvec_alloc (units);
/* We need to call this function after we set the scalar const_tiny_rtx
@@ -5227,7 +5229,8 @@
word_mode = VOIDmode;
double_mode = VOIDmode;
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
+ for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
+ mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
{
if (GET_MODE_BITSIZE (mode) == BITS_PER_UNIT
@@ -5239,7 +5242,8 @@
word_mode = mode;
}
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
+ for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
+ mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
{
if (GET_MODE_BITSIZE (mode) == DOUBLE_TYPE_SIZE
@@ -5324,14 +5328,22 @@
REAL_VALUE_TYPE *r =
(i == 0 ? &dconst0 : i == 1 ? &dconst1 : &dconst2);
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
+ for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
+ mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
const_tiny_rtx[i][(int) mode] =
CONST_DOUBLE_FROM_REAL_VALUE (*r, mode);
+ for (mode = GET_CLASS_NARROWEST_MODE (MODE_DECIMAL_FLOAT);
+ mode != VOIDmode;
+ mode = GET_MODE_WIDER_MODE (mode))
+ const_tiny_rtx[i][(int) mode] =
+ CONST_DOUBLE_FROM_REAL_VALUE (*r, mode);
+
const_tiny_rtx[i][(int) VOIDmode] = GEN_INT (i);
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
+ for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
+ mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
const_tiny_rtx[i][(int) mode] = GEN_INT (i);
Index: simplify-rtx.c
===================================================================
--- simplify-rtx.c (revision 108635)
+++ simplify-rtx.c (working copy)
@@ -640,6 +640,9 @@
break;
case FLOAT_TRUNCATE:
+ if (DECIMAL_FLOAT_MODE_P (mode))
+ break;
+
/* (float_truncate:SF (float_extend:DF foo:SF)) = foo:SF. */
if (GET_CODE (op) == FLOAT_EXTEND
&& GET_MODE (XEXP (op, 0)) == mode)
@@ -693,6 +696,9 @@
break;
case FLOAT_EXTEND:
+ if (DECIMAL_FLOAT_MODE_P (mode))
+ break;
+
/* (float_extend (float_extend x)) is (float_extend x)
(float_extend (float x)) is (float x) assuming that double
@@ -4284,6 +4290,7 @@
break;
case MODE_FLOAT:
+ case MODE_DECIMAL_FLOAT:
{
REAL_VALUE_TYPE r;
long tmp[max_bitsize / 32];
Index: varasm.c
===================================================================
--- varasm.c (revision 108635)
+++ varasm.c (working copy)
@@ -3077,6 +3077,7 @@
switch (GET_MODE_CLASS (mode))
{
case MODE_FLOAT:
+ case MODE_DECIMAL_FLOAT:
{
REAL_VALUE_TYPE r;
Index: convert.c
===================================================================
--- convert.c (revision 108635)
+++ convert.c (working copy)
@@ -263,6 +263,28 @@
&& FLOAT_TYPE_P (TREE_TYPE (arg1)))
{
tree newtype = type;
+
+ if (TYPE_MODE (TREE_TYPE (arg0)) == SDmode
+ || TYPE_MODE (TREE_TYPE (arg1)) == SDmode)
+ newtype = dfloat32_type_node;
+ if (TYPE_MODE (TREE_TYPE (arg0)) == DDmode
+ || TYPE_MODE (TREE_TYPE (arg1)) == DDmode)
+ newtype = dfloat64_type_node;
+ if (TYPE_MODE (TREE_TYPE (arg0)) == TDmode
+ || TYPE_MODE (TREE_TYPE (arg1)) == TDmode)
+ newtype = dfloat128_type_node;
+ if (newtype == dfloat32_type_node
+ || newtype == dfloat64_type_node
+ || newtype == dfloat128_type_node)
+ {
+ expr = build2 (TREE_CODE (expr), newtype,
+ fold (convert_to_real (newtype, arg0)),
+ fold (convert_to_real (newtype, arg1)));
+ if (newtype == type)
+ return expr;
+ break;
+ }
+
if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (newtype))
newtype = TREE_TYPE (arg0);
if (TYPE_PRECISION (TREE_TYPE (arg1)) > TYPE_PRECISION (newtype))
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