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| author | Jakub Jelinek <jakub@redhat.com> | 2010-10-18 10:26:06 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2010-10-18 10:26:06 +0200 |
| commit | 8ddf04c2b02d457ee08a8158dab98ec2f3273d66 (patch) | |
| tree | b7acef529c889515ad15e65810919314e6d35650 /gcc/fold-const.c | |
| parent | 1d32bbcdcb9839efa24655752ce90ce2ae97fa06 (diff) | |
| download | gcc-8ddf04c2b02d457ee08a8158dab98ec2f3273d66.zip gcc-8ddf04c2b02d457ee08a8158dab98ec2f3273d66.tar.gz gcc-8ddf04c2b02d457ee08a8158dab98ec2f3273d66.tar.bz2 | |
re PR middle-end/46019 (x / (0x200000000ULL << y) miscompilation with 32-bit HWI)
PR middle-end/46019
* fold-const.c (fold_binary_loc): If integer_pow2p has
TREE_INT_CST_LOW zero, look at TREE_INT_CST_HIGH.
* gcc.c-torture/execute/pr46019.c: New test.
From-SVN: r165610
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 8146920..808f491 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -11611,7 +11611,13 @@ fold_binary_loc (location_t loc, if (integer_pow2p (sval) && tree_int_cst_sgn (sval) > 0) { tree sh_cnt = TREE_OPERAND (arg1, 1); - unsigned long pow2 = exact_log2 (TREE_INT_CST_LOW (sval)); + unsigned long pow2; + + if (TREE_INT_CST_LOW (sval)) + pow2 = exact_log2 (TREE_INT_CST_LOW (sval)); + else + pow2 = exact_log2 (TREE_INT_CST_HIGH (sval)) + + HOST_BITS_PER_WIDE_INT; if (strict_overflow_p) fold_overflow_warning (("assuming signed overflow does not " |