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[PATCH][GCC][AArch64] Inline calls to lrint when possible


Hi All,

This patch allows the inlining of lrint when -fno-math-errno
assuming that errno does not need to be set when the rounded value
is not representable as a long.

The case

void f(double *a, long *b, double x)
{
	*a = __builtin_rint(x);
	*b = __builtin_lrint(x);
}

now generates with -fno-math-errno:

f:
	frintx	d0, d0
	fcvtzs	x2, d0
	str	d0, [x0]
	str	x2, [x1]
	ret

When the flag is not used the same function call is emitted as before:

f:
	stp	x29, x30, [sp, -32]!
	frintx	d1, d0
	add	x29, sp, 0
	str	x19, [sp, 16]
	mov	x19, x1
	str	d1, [x0]
	bl	lrint
	str	x0, [x19]
	ldr	x19, [sp, 16]
	ldp	x29, x30, [sp], 32
	ret

Bootstrapped and regtested on aarch64-none-linux-gnu and no regressions.
The patch also has no regressions on Spec2006.

Ok for trunk?

gcc/
2017-06-07  Tamar Christina  <tamar.christina@arm.com>

	* config/aarch64/aarch64.md (lrint<GPF:mode><GPI:mode>2): New.

gcc/testsuite/
2017-06-07  Tamar Christina  <tamar.christina@arm.com>

	* gcc.target/aarch64/lrint-matherr.h: New.
	* gcc.target/aarch64/inline-lrint_1.c: New.
	* gcc.target/aarch64/inline-lrint_2.c: New.
	* gcc.target/aarch64/no-inline-lrint_1.c: New.
	* gcc.target/aarch64/no-inline-lrint_2.c: New.
diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index 5adc5edb8dde9c30450b04932a37c41f84cc5ed1..c65159085e342f7611104b2890de99fc02e6fb8e 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -4997,6 +4997,18 @@
   [(set_attr "type" "f_minmax<stype>")]
 )
 
+(define_expand "lrint<GPF:mode><GPI:mode>2"
+  [(match_operand:GPI 0 "register_operand")
+   (match_operand:GPF 1 "register_operand")]
+  "TARGET_FLOAT"
+{
+  rtx cvt = gen_reg_rtx (<GPF:MODE>mode);
+  emit_insn (gen_rint<GPF:mode>2 (cvt, operands[1]));
+  emit_insn (gen_lbtrunc<GPF:mode><GPI:mode>2 (operands[0], cvt));
+  DONE;
+}
+)
+
 ;; For copysign (x, y), we want to generate:
 ;;
 ;;   LDR d2, #(1 << 63)
diff --git a/gcc/testsuite/gcc.target/aarch64/inline-lrint_1.c b/gcc/testsuite/gcc.target/aarch64/inline-lrint_1.c
new file mode 100644
index 0000000000000000000000000000000000000000..876cecd674b7cb35bc18d5cd3aa5587813e53dd9
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/inline-lrint_1.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-options "-O3 -fno-math-errno" } */
+
+#include "lrint-matherr.h"
+
+TEST (dld, double, long, )
+TEST (flf, float , long, )
+
+TEST (did, double, int, )
+TEST (fif, float , int, )
+
+TEST (dlld, double, long long, l)
+TEST (fllf, float , long long, l)
+
+/* { dg-final { scan-assembler-times "frintx\td\[0-9\]+, d\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "frintx\ts\[0-9\]+, s\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "fcvtzs\tx\[0-9\]+, d\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "fcvtzs\tx\[0-9\]+, s\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-not "bl"    } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/inline-lrint_2.c b/gcc/testsuite/gcc.target/aarch64/inline-lrint_2.c
new file mode 100644
index 0000000000000000000000000000000000000000..baa5aee761788e2b83f8f9283bb0aa7d79aad348
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/inline-lrint_2.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target ilp32 } */
+/* { dg-options "-O3 -fno-math-errno" } */
+
+#include "lrint-matherr.h"
+
+TEST (dld, double, long, )
+TEST (flf, float , long, )
+
+TEST (did, double, int, )
+TEST (fif, float , int, )
+
+TEST (dlld, double, long long, l)
+TEST (fllf, float , long long, l)
+
+/* { dg-final { scan-assembler-times "frintx\td\[0-9\]+, d\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "frintx\ts\[0-9\]+, s\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "fcvtzs\tx\[0-9\]+, d\[0-9\]+" 1 } } */
+/* { dg-final { scan-assembler-times "fcvtzs\tx\[0-9\]+, s\[0-9\]+" 1 } } */
+/* { dg-final { scan-assembler-times "fcvtzs\tw\[0-9\]+, d\[0-9\]+" 2 } } */
+/* { dg-final { scan-assembler-times "fcvtzs\tw\[0-9\]+, s\[0-9\]+" 2 } } */
+/* { dg-final { scan-assembler-not "bl"    } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/lrint-matherr.h b/gcc/testsuite/gcc.target/aarch64/lrint-matherr.h
new file mode 100644
index 0000000000000000000000000000000000000000..cc6e3d13f9bd47a316cc56a07917f4b5de185236
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/lrint-matherr.h
@@ -0,0 +1,5 @@
+#define TEST(name, float_type, int_type, pref) void f_##name (float_type x) \
+{									    \
+  volatile float_type a = __builtin_rint (x);				    \
+  volatile int_type   b = __builtin_l##pref##rint (x);			    \
+}
diff --git a/gcc/testsuite/gcc.target/aarch64/no-inline-lrint_1.c b/gcc/testsuite/gcc.target/aarch64/no-inline-lrint_1.c
new file mode 100644
index 0000000000000000000000000000000000000000..fb7f0655687568e9d6783acf88ef56b54a73c2c5
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/no-inline-lrint_1.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-options "-O3" } */
+
+#include "lrint-matherr.h"
+
+TEST (dld, double, long, )
+TEST (flf, float , long, )
+
+TEST (did, double, int, )
+TEST (fif, float , int, )
+
+TEST (dlld, double, long long, l)
+TEST (fllf, float , long long, l)
+
+/* { dg-final { scan-assembler-times "frintx\td\[0-9\]+, d\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "frintx\ts\[0-9\]+, s\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "bl\tlrint"  4 } } */
+/* { dg-final { scan-assembler-times "bl\tllrint" 2 } } */
+/* { dg-final { scan-assembler-not "fcvtzs" } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/no-inline-lrint_2.c b/gcc/testsuite/gcc.target/aarch64/no-inline-lrint_2.c
new file mode 100644
index 0000000000000000000000000000000000000000..c99843c3a25fbd519f2959d3eb0ce3da3f7f16d9
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/no-inline-lrint_2.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target ilp32 } */
+/* { dg-options "-O3" } */
+
+#include "lrint-matherr.h"
+
+TEST (dld, double, long, )
+TEST (flf, float , long, )
+
+TEST (did, double, int, )
+TEST (fif, float , int, )
+
+TEST (dlld, double, long long, l)
+TEST (fllf, float , long long, l)
+
+/* { dg-final { scan-assembler-times "frintx\td\[0-9\]+, d\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "frintx\ts\[0-9\]+, s\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "bl\tlrint"  4 } } */
+/* { dg-final { scan-assembler-times "bl\tllrint" 2 } } */
+/* { dg-final { scan-assembler-not "fcvtzs" } } */

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