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* [gcc r12-5458] Re: [PATCH] PR tree-optimization/96779 Adding a missing pattern to match.pd
@ 2021-11-23 0:48 Jeff Law
0 siblings, 0 replies; only message in thread
From: Jeff Law @ 2021-11-23 0:48 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:e888bea2384a0d8d29a6545c4f57f41cb49df0a6
commit r12-5458-ge888bea2384a0d8d29a6545c4f57f41cb49df0a6
Author: Navid Rahimi <navidrahimi@microsoft.com>
Date: Mon Nov 22 19:46:17 2021 -0500
Re: [PATCH] PR tree-optimization/96779 Adding a missing pattern to match.pd
PR tree-optimization/96779
gcc/
* match.pd (-x == x) -> (x == 0): New optimization.
gcc/testsuite
* gcc.dg/tree-ssa/pr96779.c: Testcase for this optimization.
* gcc.dg/tree-ssa/pr96779-disabled.c: Testcase for this optimization
when -fwrapv passed.
Diff:
---
gcc/match.pd | 8 +++
gcc/testsuite/gcc.dg/tree-ssa/pr96779-disabled.c | 84 ++++++++++++++++++++++++
gcc/testsuite/gcc.dg/tree-ssa/pr96779.c | 79 ++++++++++++++++++++++
3 files changed, 171 insertions(+)
diff --git a/gcc/match.pd b/gcc/match.pd
index f059b477f58..5d71a4f907c 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -242,6 +242,14 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(mult @0 integer_zerop@1)
@1)
+/* -x == x -> x == 0 */
+(for cmp (eq ne)
+ (simplify
+ (cmp:c @0 (negate @0))
+ (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
+ && !TYPE_OVERFLOW_WRAPS (TREE_TYPE(@0)))
+ (cmp @0 { build_zero_cst (TREE_TYPE(@0)); }))))
+
/* Maybe fold x * 0 to 0. The expressions aren't the same
when x is NaN, since x * 0 is also NaN. Nor are they the
same in modes with signed zeros, since multiplying a
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr96779-disabled.c b/gcc/testsuite/gcc.dg/tree-ssa/pr96779-disabled.c
new file mode 100644
index 00000000000..205133d8e0c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr96779-disabled.c
@@ -0,0 +1,84 @@
+/* PR tree-optimization/96779 */
+/* { dg-do run } */
+/* { dg-options "-O -fdump-tree-optimized -fwrapv" } */
+
+#include <stdbool.h>
+
+bool __attribute__ ((noipa)) f_func(int a)
+{
+ return -a == a;
+}
+
+bool __attribute__ ((noipa)) g_func(unsigned int a)
+{
+ return -a == a;
+}
+
+bool __attribute__ ((noipa)) h_func(short a)
+{
+ return -a == a;
+}
+
+bool __attribute__ ((noipa)) k_func(long a)
+{
+ return -a == a;
+}
+
+int
+main (void)
+{
+ // few randomly generated test cases
+ if (f_func (71856034))
+ {
+ __builtin_abort ();
+ }
+ if (g_func (71856034))
+ {
+ __builtin_abort ();
+ }
+ if (h_func (1744))
+ {
+ __builtin_abort ();
+ }
+ if (k_func (68268386))
+ {
+ __builtin_abort ();
+ }
+ if (f_func (-112237))
+ {
+ __builtin_abort ();
+ }
+ if (g_func (-787116))
+ {
+ __builtin_abort ();
+ }
+ if (h_func (-863))
+ {
+ __builtin_abort ();
+ }
+ if (k_func (-787116))
+ {
+ __builtin_abort ();
+ }
+ if (!f_func (0))
+ {
+ __builtin_abort ();
+ }
+ if (!g_func (0))
+ {
+ __builtin_abort ();
+ }
+ if (!h_func (0))
+ {
+ __builtin_abort ();
+ }
+ if (!k_func (0))
+ {
+ __builtin_abort ();
+ }
+
+ return 0;
+}
+
+/* Verify that we have *not* transfered "= -" pattern in any of those functions. */
+/* { dg-final { scan-tree-dump-times "= -" 4 "optimized" } } */
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr96779.c b/gcc/testsuite/gcc.dg/tree-ssa/pr96779.c
new file mode 100644
index 00000000000..0d46e8eeb15
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr96779.c
@@ -0,0 +1,79 @@
+/* PR tree-optimization/96779 */
+/* { dg-do run } */
+/* { dg-options "-O -fdump-tree-optimized" } */
+
+#include <stdbool.h>
+
+bool __attribute__ ((noipa)) f_func(int a)
+{
+ return -a == a;
+}
+
+bool __attribute__ ((noipa)) h_func(short a)
+{
+ return -a == a;
+}
+
+bool __attribute__ ((noipa)) k_func(long a)
+{
+ return -a == a;
+}
+
+int
+main (void)
+{
+ // few randomly generated test cases
+ if (f_func (71856034))
+ {
+ __builtin_abort ();
+ }
+ if (f_func (71856034))
+ {
+ __builtin_abort ();
+ }
+ if (h_func (1744))
+ {
+ __builtin_abort ();
+ }
+ if (k_func (68268386))
+ {
+ __builtin_abort ();
+ }
+ if (f_func (-112237))
+ {
+ __builtin_abort ();
+ }
+ if (f_func (-787116))
+ {
+ __builtin_abort ();
+ }
+ if (h_func (-863))
+ {
+ __builtin_abort ();
+ }
+ if (k_func (-787116))
+ {
+ __builtin_abort ();
+ }
+ if (!f_func (0))
+ {
+ __builtin_abort ();
+ }
+ if (!f_func (0))
+ {
+ __builtin_abort ();
+ }
+ if (!h_func (0))
+ {
+ __builtin_abort ();
+ }
+ if (!k_func (0))
+ {
+ __builtin_abort ();
+ }
+
+ return 0;
+}
+
+/* Verify that we transfered to "= -" pattern from "_2 = -_1;". */
+/* { dg-final { scan-tree-dump-not "= -" "optimized" } } */
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