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| author | amylaar <amylaar@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-11-11 18:57:25 +0000 |
|---|---|---|
| committer | amylaar <amylaar@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-11-11 18:57:25 +0000 |
| commit | 8e65ec8ada64174c858ba2d65dbba194464d9a69 (patch) | |
| tree | bd3f256f9532dd32e0b470b34c5b165d836cdf7d /gcc/expmed.c | |
| parent | a86feb4c3acf0323659d9c003171ec3c933241a4 (diff) | |
| download | gcc-8e65ec8ada64174c858ba2d65dbba194464d9a69.tar.gz | |
PR middle-end/59049
* expmed.c (emit_store_flag): Fail for const-const comparison.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@204682 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 59f81df5adf..1617bc05aa1 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -5401,6 +5401,13 @@ emit_store_flag (rtx target, enum rtx_code code, rtx op0, rtx op1, rtx subtarget; rtx tem, last, trueval; + /* If we compare constants, we shouldn't use a store-flag operation, + but a constant load. We can get there via the vanilla route that + usually generates a compare-branch sequence, but will in this case + fold the comparison to a constant, and thus elide the branch. */ + if (CONSTANT_P (op0) && CONSTANT_P (op1)) + return NULL_RTX; + tem = emit_store_flag_1 (target, code, op0, op1, mode, unsignedp, normalizep, target_mode); if (tem) |