diff options
| author | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-10-23 15:57:09 +0000 |
|---|---|---|
| committer | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-10-23 15:57:09 +0000 |
| commit | 7b56081a687b3949086fe37b26a825c7567630bf (patch) | |
| tree | e71fcaef7ab6dc1b0e93c1f57a474e7fe80156e3 /gcc/fold-const.c | |
| parent | 48976c0798a3541bd92888e554e41ae1654c4453 (diff) | |
| download | gcc-7b56081a687b3949086fe37b26a825c7567630bf.tar.gz | |
* fold-const.c (invert_tree_comparison): Always invert EQ_EXPR/NE_EXPR.
PR tree-optimization/44683
* tree-ssa-dom.c (record_edge_info): Record simple equivalences only if
we can be sure that there are no signed zeros involved.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@180340 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index a838c345881..e4c258903f7 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -2100,15 +2100,14 @@ pedantic_non_lvalue_loc (location_t loc, tree x) return protected_set_expr_location_unshare (x, loc); } -/* Given a tree comparison code, return the code that is the logical inverse - of the given code. It is not safe to do this for floating-point - comparisons, except for NE_EXPR and EQ_EXPR, so we receive a machine mode - as well: if reversing the comparison is unsafe, return ERROR_MARK. */ +/* Given a tree comparison code, return the code that is the logical inverse. + It is generally not safe to do this for floating-point comparisons, except + for EQ_EXPR and NE_EXPR, so we return ERROR_MARK in this case. */ enum tree_code invert_tree_comparison (enum tree_code code, bool honor_nans) { - if (honor_nans && flag_trapping_math) + if (honor_nans && flag_trapping_math && code != EQ_EXPR && code != NE_EXPR) return ERROR_MARK; switch (code) |