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| author | Navid Rahimi <navidrahimi@microsoft.com> | 2022-01-28 17:11:30 -0500 |
|---|---|---|
| committer | Jeff Law <jeffreyalaw@gmail.com> | 2022-01-28 17:13:08 -0500 |
| commit | cb3ac1985a5332fa811a62844adb33ca140bd4ba (patch) | |
| tree | e8b109bf7cac75e22a362e7c3550d0b66e898f58 /gcc | |
| parent | 5d8b422818714737bd61d1667461efce96687073 (diff) | |
| download | gcc-cb3ac1985a5332fa811a62844adb33ca140bd4ba.zip gcc-cb3ac1985a5332fa811a62844adb33ca140bd4ba.tar.gz gcc-cb3ac1985a5332fa811a62844adb33ca140bd4ba.tar.bz2 | |
tree-optimization/103514 Missing XOR-EQ-AND Optimization
This patch will add the missed pattern described in bug 103514 [1] to the match.pd. [1] includes proof of correctness for the patch too.
1) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103514
gcc/
PR tree-optimization/103514
* match.pd (a & b) ^ (a == b) -> !(a | b): New optimization.
(a & b) == (a ^ b) -> !(a | b): New optimization.
gcc/testsuite
* gcc.dg/tree-ssa/pr103514.c: Testcase for this optimization.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/match.pd | 8 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/pr103514.c | 33 |
2 files changed, 41 insertions, 0 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index bd76da6..0544ddd 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -1784,6 +1784,14 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) (negate (nop_convert? (bit_not @0))) (plus (view_convert @0) { build_each_one_cst (type); })) +/* (a & b) ^ (a == b) -> !(a | b) */ +/* (a & b) == (a ^ b) -> !(a | b) */ +(for first_op (bit_xor eq) + second_op (eq bit_xor) + (simplify + (first_op:c (bit_and:c truth_valued_p@0 truth_valued_p@1) (second_op:c @0 @1)) + (bit_not (bit_ior @0 @1)))) + /* Convert ~ (A - 1) or ~ (A + -1) to -A. */ (simplify (bit_not (convert? (minus @0 integer_each_onep))) diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr103514.c b/gcc/testsuite/gcc.dg/tree-ssa/pr103514.c new file mode 100644 index 0000000..de3709c --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr103514.c @@ -0,0 +1,33 @@ +/* { dg-do compile } */ +/* { dg-options "-O -fdump-tree-optimized" } */ +#include <stdbool.h> + +bool +i (bool a, bool b) +{ + return (a & b) ^ (a == b); +} + +bool +j (bool a, bool b) +{ + return (a & b) == (a ^ b); +} + +bool +g (bool a, bool b) +{ + return (a && b) == (a ^ b); +} + +bool +h (bool a, bool b) +{ + return (a && b) ^ (a == b); +} + + +/* Make sure we have removed "==" and "^" and "&". */ +/* { dg-final { scan-tree-dump-not "&" "optimized"} } */ +/* { dg-final { scan-tree-dump-not "\\^" "optimized"} } */ +/* { dg-final { scan-tree-dump-not "==" "optimized"} } */
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