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| author | Kazu Hirata <kazu@codesourcery.com> | 2006-05-21 15:13:36 +0000 |
|---|---|---|
| committer | Kazu Hirata <kazu@gcc.gnu.org> | 2006-05-21 15:13:36 +0000 |
| commit | 4d49d44d6619d257f7635ef4c449d0b036add018 (patch) | |
| tree | 34fe4de54e40acf8897300094b90a362f9af7693 /gcc/simplify-rtx.c | |
| parent | 6531d1be909aabc40e765eccd6327512528a94bc (diff) | |
| download | gcc-4d49d44d6619d257f7635ef4c449d0b036add018.zip gcc-4d49d44d6619d257f7635ef4c449d0b036add018.tar.gz gcc-4d49d44d6619d257f7635ef4c449d0b036add018.tar.bz2 | |
re PR rtl-optimization/27671 (optimization error on pentium4-Linux with %, regression from gcc-4.1.0)
gcc/
PR rtl-optimization/27671
* simplify-rtx.c (simplify_relational_operation_1): Fix
simplifications of (eq/ne (xor x y) y) and
(eq/ne (xor x y) x).
gcc/testsuite/
PR rtl-optimization/27671
* gcc.c-torture/execute/pr27671-1.c: New.
* gcc.dg/pr27671-2.c: Likewise.
From-SVN: r113955
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index 962c2de..6ab5cb7 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -3604,18 +3604,21 @@ simplify_relational_operation_1 (enum rtx_code code, enum machine_mode mode, return simplify_gen_relational (code, mode, cmp_mode, XEXP (op0, 0), XEXP (op0, 1)); - /* (eq/ne (xor x y) x) simplifies to (eq/ne x 0). */ + /* (eq/ne (xor x y) x) simplifies to (eq/ne y 0). */ if ((code == EQ || code == NE) && op0code == XOR && rtx_equal_p (XEXP (op0, 0), op1) - && !side_effects_p (XEXP (op0, 1))) - return simplify_gen_relational (code, mode, cmp_mode, op1, const0_rtx); - /* Likewise (eq/ne (xor x y) y) simplifies to (eq/ne y 0). */ + && !side_effects_p (XEXP (op0, 0))) + return simplify_gen_relational (code, mode, cmp_mode, + XEXP (op0, 1), const0_rtx); + + /* Likewise (eq/ne (xor x y) y) simplifies to (eq/ne x 0). */ if ((code == EQ || code == NE) && op0code == XOR && rtx_equal_p (XEXP (op0, 1), op1) - && !side_effects_p (XEXP (op0, 0))) - return simplify_gen_relational (code, mode, cmp_mode, op1, const0_rtx); + && !side_effects_p (XEXP (op0, 1))) + return simplify_gen_relational (code, mode, cmp_mode, + XEXP (op0, 0), const0_rtx); /* (eq/ne (xor x C1) C2) simplifies to (eq/ne x (C1^C2)). */ if ((code == EQ || code == NE) |