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| author | Richard Biener <rguenther@suse.de> | 2016-03-22 13:23:00 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2016-03-22 13:23:00 +0000 |
| commit | 9a10956c4bbf9fd7ff35cc87cea14e6cb6b3812c (patch) | |
| tree | 4622382e583a127b4ebc7b3e6034749c6bb154d0 /gcc/fold-const.c | |
| parent | 380d99c9aacfb3e4c1b23a0dee93110fe6a47e24 (diff) | |
| download | gcc-9a10956c4bbf9fd7ff35cc87cea14e6cb6b3812c.zip gcc-9a10956c4bbf9fd7ff35cc87cea14e6cb6b3812c.tar.gz gcc-9a10956c4bbf9fd7ff35cc87cea14e6cb6b3812c.tar.bz2 | |
re PR target/70333 (Test miscompiled with -O0.)
2016-03-22 Richard Biener <rguenther@suse.de>
PR middle-end/70333
* fold-const.c (extract_muldiv_1): Properly perform multiplication
in the wide type.
* gcc.dg/torture/pr70333.c: New testcase.
From-SVN: r234401
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 696b4a6..9d861c6 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -6376,18 +6376,17 @@ extract_muldiv_1 (tree t, tree c, enum tree_code code, tree wide_type, bool overflow_p = false; bool overflow_mul_p; signop sign = TYPE_SIGN (ctype); - wide_int mul = wi::mul (op1, c, sign, &overflow_mul_p); + unsigned prec = TYPE_PRECISION (ctype); + wide_int mul = wi::mul (wide_int::from (op1, prec, sign), + wide_int::from (c, prec, sign), + sign, &overflow_mul_p); overflow_p = TREE_OVERFLOW (c) | TREE_OVERFLOW (op1); if (overflow_mul_p && ((sign == UNSIGNED && tcode != MULT_EXPR) || sign == SIGNED)) overflow_p = true; if (!overflow_p) - { - mul = wide_int::from (mul, TYPE_PRECISION (ctype), - TYPE_SIGN (TREE_TYPE (op1))); - return fold_build2 (tcode, ctype, fold_convert (ctype, op0), - wide_int_to_tree (ctype, mul)); - } + return fold_build2 (tcode, ctype, fold_convert (ctype, op0), + wide_int_to_tree (ctype, mul)); } /* If these operations "cancel" each other, we have the main |