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* [gcc r12-4559] [Patch][GCC][middle-end] - Generate FRINTZ for (double)(int) under -ffast-math on aarch64
@ 2021-10-20 12:15 Andre Simoes Dias Vieira
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From: Andre Simoes Dias Vieira @ 2021-10-20 12:15 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:914045dff10fbd27de27b90a0ac78a0058b2c86e
commit r12-4559-g914045dff10fbd27de27b90a0ac78a0058b2c86e
Author: Andre Simoes Dias Vieira <andre.simoesdiasvieira@arm.com>
Date: Wed Oct 20 13:12:09 2021 +0100
[Patch][GCC][middle-end] - Generate FRINTZ for (double)(int) under -ffast-math on aarch64
20-10-2021 Andre Vieira <andre.simoesdiasvieira@arm.com>
Jirui Wu <jirui.wu@arm.com>
gcc/ChangeLog:
* match.pd: Generate IFN_TRUNC.
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/merge_trunc1.c: New test.
Diff:
---
gcc/match.pd | 13 ++++++++
gcc/testsuite/gcc.target/aarch64/merge_trunc1.c | 41 +++++++++++++++++++++++++
2 files changed, 54 insertions(+)
diff --git a/gcc/match.pd b/gcc/match.pd
index 3ff15bc0de5..5bed2e12715 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -3606,6 +3606,19 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
>= inside_prec - !inside_unsignedp)
(convert @0)))))))
+/* (float_type)(integer_type) x -> trunc (x) if the type of x matches
+ float_type. Only do the transformation if we do not need to preserve
+ trapping behaviour, so require !flag_trapping_math. */
+#if GIMPLE
+(simplify
+ (float (fix_trunc @0))
+ (if (!flag_trapping_math
+ && types_match (type, TREE_TYPE (@0))
+ && direct_internal_fn_supported_p (IFN_TRUNC, type,
+ OPTIMIZE_FOR_BOTH))
+ (IFN_TRUNC @0)))
+#endif
+
/* If we have a narrowing conversion to an integral type that is fed by a
BIT_AND_EXPR, we might be able to remove the BIT_AND_EXPR if it merely
masks off bits outside the final type (and nothing else). */
diff --git a/gcc/testsuite/gcc.target/aarch64/merge_trunc1.c b/gcc/testsuite/gcc.target/aarch64/merge_trunc1.c
new file mode 100644
index 00000000000..07217064e2b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/merge_trunc1.c
@@ -0,0 +1,41 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ffast-math" } */
+
+float
+f1 (float x)
+{
+ int y = x;
+
+ return (float) y;
+}
+
+double
+f2 (double x)
+{
+ long y = x;
+
+ return (double) y;
+}
+
+float
+f3 (double x)
+{
+ int y = x;
+
+ return (float) y;
+}
+
+double
+f4 (float x)
+{
+ int y = x;
+
+ return (double) y;
+}
+
+/* { dg-final { scan-assembler "frintz\\ts\[0-9\]+, s\[0-9\]+" } } */
+/* { dg-final { scan-assembler "frintz\\td\[0-9\]+, d\[0-9\]+" } } */
+/* { dg-final { scan-assembler "fcvtzs\\tw\[0-9\]+, d\[0-9\]+" } } */
+/* { dg-final { scan-assembler "scvtf\\ts\[0-9\]+, w\[0-9\]+" } } */
+/* { dg-final { scan-assembler "fcvtzs\\tw\[0-9\]+, s\[0-9\]+" } } */
+/* { dg-final { scan-assembler "scvtf\\td\[0-9\]+, w\[0-9\]+" } } */
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