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* [gcc r13-4311] tree-optimization/103356 Add missing (~a) == b folding for _Bool
@ 2022-11-26 18:00 Andrew Pinski
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From: Andrew Pinski @ 2022-11-26 18:00 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:f9378e3cc390f9bcc310ce206c6773a817aff2ca
commit r13-4311-gf9378e3cc390f9bcc310ce206c6773a817aff2ca
Author: Andrew Pinski <apinski@marvell.com>
Date: Sat Nov 26 07:37:40 2022 +0000
tree-optimization/103356 Add missing (~a) == b folding for _Bool
The following makes sure to fold (~a) == b to a ^ b for truth
values.
OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
Thanks,
Andrew Pinski
PR tree-optimization/103356
gcc/ChangeLog:
* match.pd: ((~a) == b -> a ^ b): New pattern.
gcc/testsuite/ChangeLog:
* gcc.dg/pr103356-1.c: New test.
Diff:
---
gcc/match.pd | 7 +++++++
gcc/testsuite/gcc.dg/pr103356-1.c | 9 +++++++++
2 files changed, 16 insertions(+)
diff --git a/gcc/match.pd b/gcc/match.pd
index a4d1386fd9f..67a0a682f31 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -1999,6 +1999,13 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
&& TYPE_PRECISION (TREE_TYPE (@0)) == 1)
(convert (eq @0 @1))))
+/* (~a) == b is a ^ b for truth valued a and b. */
+(simplify
+ (eq:c (bit_not:s truth_valued_p@0) truth_valued_p@1)
+ (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
+ && TYPE_PRECISION (TREE_TYPE (@0)) == 1)
+ (convert (bit_xor @0 @1))))
+
/* (x & ~m) | (y & m) -> ((x ^ y) & m) ^ x */
(simplify
(bit_ior:c (bit_and:cs @0 (bit_not @2)) (bit_and:cs @1 @2))
diff --git a/gcc/testsuite/gcc.dg/pr103356-1.c b/gcc/testsuite/gcc.dg/pr103356-1.c
new file mode 100644
index 00000000000..61d0b81da22
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr103356-1.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-forwprop1" } */
+
+_Bool foo (_Bool a, _Bool b)
+{
+ return a == (!b);
+}
+
+/* { dg-final { scan-tree-dump "\[ab\]_\[0-9\]+\\(D\\) \\\^ \[ba\]_\[0-9\]+\\(D\\)" "forwprop1" } } */
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