diff options
| author | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2009-05-02 17:50:21 +0000 |
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| committer | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2009-05-02 17:50:21 +0000 |
| commit | b4c97a12cde6c05758d10c0fb72286de25de7384 (patch) | |
| tree | f2f2c3594fa344d101ce44382e9b1c8a2796ea49 /gcc/tree-ssa-pre.c | |
| parent | f09f132bf38987009051ac7c8489dc36b5d4e1b8 (diff) | |
| download | gcc-b4c97a12cde6c05758d10c0fb72286de25de7384.tar.gz | |
2009-05-02 Richard Guenther <rguenther@suse.de>
PR tree-optimization/39940
* tree-ssa-pre.c (eliminate): Make sure we may propagate before
doing so.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@147065 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-ssa-pre.c')
| -rw-r--r-- | gcc/tree-ssa-pre.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c index 11b88eddc36..3273c194981 100644 --- a/gcc/tree-ssa-pre.c +++ b/gcc/tree-ssa-pre.c @@ -4215,7 +4215,9 @@ eliminate (void) /* If there is a single use only, propagate the equivalency instead of keeping the copy. */ if (TREE_CODE (lhs) == SSA_NAME - && single_imm_use (lhs, &use_p, &use_stmt)) + && single_imm_use (lhs, &use_p, &use_stmt) + && may_propagate_copy (USE_FROM_PTR (use_p), + gimple_assign_rhs1 (stmt))) { SET_USE (use_p, gimple_assign_rhs1 (stmt)); update_stmt (use_stmt); |