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| author | Jakub Jelinek <jakub@redhat.com> | 2009-04-22 23:57:52 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2009-04-22 23:57:52 +0200 |
| commit | 2c0eba5af00a2544e7e15bd8052a53bdb2b6f22f (patch) | |
| tree | 9490a0f1996cc98864effb946df615d1062f9693 /gcc/fold-const.c | |
| parent | 023f059b5c168cb31e8818d2c983f5687b169df4 (diff) | |
| download | gcc-2c0eba5af00a2544e7e15bd8052a53bdb2b6f22f.zip gcc-2c0eba5af00a2544e7e15bd8052a53bdb2b6f22f.tar.gz gcc-2c0eba5af00a2544e7e15bd8052a53bdb2b6f22f.tar.bz2 | |
re PR c/39855 (Shift optimization discards operands' side effects)
PR c/39855
* fold-const.c (fold_binary) <case LSHIFT_EXPR>: When optimizing
into 0, use omit_one_operand.
* gcc.dg/torture/pr39855.c: New test.
From-SVN: r146617
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index ca07cf1..f0ff5b6 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -11880,7 +11880,8 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1) if (code == LROTATE_EXPR || code == RROTATE_EXPR) low = low % TYPE_PRECISION (type); else if (TYPE_UNSIGNED (type) || code == LSHIFT_EXPR) - return build_int_cst (type, 0); + return omit_one_operand (type, build_int_cst (type, 0), + TREE_OPERAND (arg0, 0)); else low = TYPE_PRECISION (type) - 1; } |