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| author | Richard Biener <rguenther@suse.de> | 2018-11-28 11:01:06 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2018-11-28 11:01:06 +0000 |
| commit | aa2e903e1d7f30c546b4e77f0aa71dff6c95754f (patch) | |
| tree | 86f6b5a39694bf5e0465d3c350bf3f154664fd26 /gcc/tree-ssa-sccvn.c | |
| parent | 80e6a1edf9f81362dd40b062ebf81ae7592d19d9 (diff) | |
| download | gcc-aa2e903e1d7f30c546b4e77f0aa71dff6c95754f.zip gcc-aa2e903e1d7f30c546b4e77f0aa71dff6c95754f.tar.gz gcc-aa2e903e1d7f30c546b4e77f0aa71dff6c95754f.tar.bz2 | |
re PR tree-optimization/79351 (Invalid tree PRE optimization around compound literal)
2018-11-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/79351
* tree-ssa-sccvn.c (vn_reference_lookup_3): For assignments from
empty CONSTRUCTORs ensure the store is at a constant position.
* gcc.dg/torture/pr79351.c: New testcase.
From-SVN: r266551
Diffstat (limited to 'gcc/tree-ssa-sccvn.c')
| -rw-r--r-- | gcc/tree-ssa-sccvn.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index e0ff405..b0b9d52 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -2115,6 +2115,7 @@ vn_reference_lookup_3 (ao_ref *ref, tree vuse, void *vr_, base2 = get_ref_base_and_extent (gimple_assign_lhs (def_stmt), &offset2, &size2, &maxsize2, &reverse); if (known_size_p (maxsize2) + && known_eq (maxsize2, size2) && operand_equal_p (base, base2, 0) && known_subrange_p (offset, maxsize, offset2, size2)) { |