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| author | Andrew Pinski <apinski@marvell.com> | 2022-11-26 07:37:40 +0000 |
|---|---|---|
| committer | Andrew Pinski <apinski@marvell.com> | 2022-11-26 18:00:43 +0000 |
| commit | f9378e3cc390f9bcc310ce206c6773a817aff2ca (patch) | |
| tree | 551a2382aab49fe3e2feb17128a22a3f4f6556f5 | |
| parent | d769c5040874bf9546f2524f3f1d2a894165f92a (diff) | |
| download | gcc-f9378e3cc390f9bcc310ce206c6773a817aff2ca.zip gcc-f9378e3cc390f9bcc310ce206c6773a817aff2ca.tar.gz gcc-f9378e3cc390f9bcc310ce206c6773a817aff2ca.tar.bz2 | |
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.
| -rw-r--r-- | gcc/match.pd | 7 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr103356-1.c | 9 |
2 files changed, 16 insertions, 0 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index a4d1386..67a0a68 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 0000000..61d0b81 --- /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" } } */ |