diff options
| author | Richard Biener <rguenther@suse.de> | 2016-09-20 12:20:37 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2016-09-20 12:20:37 +0000 |
| commit | b5bbe47bb37addb3c5b6c6065a28fa44953ed351 (patch) | |
| tree | 75ef75742e552f3d06ccaddc5e7c0999269e3dae /gcc/tree-ssa-sccvn.c | |
| parent | 564beb5f9b4cd40b4d60a524dd41950faec9a40d (diff) | |
| download | gcc-b5bbe47bb37addb3c5b6c6065a28fa44953ed351.zip gcc-b5bbe47bb37addb3c5b6c6065a28fa44953ed351.tar.gz gcc-b5bbe47bb37addb3c5b6c6065a28fa44953ed351.tar.bz2 | |
re PR tree-optimization/77646 (GCC Segfault with -O3)
2016-09-20 Richard Biener <rguenther@suse.de>
PR tree-optimization/77646
* tree-ssa-sccvn.c (visit_reference_op_call): Always value-number
a VDEF.
* gcc.dg/torture/pr77646.c: New testcase.
From-SVN: r240261
Diffstat (limited to 'gcc/tree-ssa-sccvn.c')
| -rw-r--r-- | gcc/tree-ssa-sccvn.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index e120b4f..bf5e97a 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -3470,6 +3470,10 @@ visit_reference_op_call (tree lhs, gcall *stmt) { if (vnresult->result_vdef && vdef) changed |= set_ssa_val_to (vdef, vnresult->result_vdef); + else if (vdef) + /* If the call was discovered to be pure or const reflect + that as far as possible. */ + changed |= set_ssa_val_to (vdef, vuse_ssa_val (gimple_vuse (stmt))); if (!vnresult->result && lhs) vnresult->result = lhs; |