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| author | Richard Biener <rguenther@suse.de> | 2018-06-06 13:03:29 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2018-06-06 13:03:29 +0000 |
| commit | 1abc0f7f52c01e5fd1a8149eab1b5f4ad4e92fa5 (patch) | |
| tree | 58c12e9abe514f02b058641bd4b7b4823d151ded /gcc/tree-ssa-sccvn.c | |
| parent | d71488c017b4ebb932cf2b4a43656e1eda670b23 (diff) | |
| download | gcc-1abc0f7f52c01e5fd1a8149eab1b5f4ad4e92fa5.zip gcc-1abc0f7f52c01e5fd1a8149eab1b5f4ad4e92fa5.tar.gz gcc-1abc0f7f52c01e5fd1a8149eab1b5f4ad4e92fa5.tar.bz2 | |
re PR tree-optimization/86062 (Missed redundancy elimination with struct and array)
2018-06-06 Richard Biener <rguenther@suse.de>
PR tree-optimization/86062
* tree-ssa-sccvn.c (vn_reference_lookup_3): Handle arbitrary
component refs ontop
of to be offsetted base.
* g++.dg/tree-ssa/pr86062.C: New testcase.
From-SVN: r261231
Diffstat (limited to 'gcc/tree-ssa-sccvn.c')
| -rw-r--r-- | gcc/tree-ssa-sccvn.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index 4e946ba..4aec41e 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -2270,14 +2270,16 @@ vn_reference_lookup_3 (ao_ref *ref, tree vuse, void *vr_, /* Apply an extra offset to the inner MEM_REF of the RHS. */ if (maybe_ne (extra_off, 0)) { - if (rhs.length () < 2 - || rhs[0].opcode != MEM_REF - || known_eq (rhs[0].off, -1)) + if (rhs.length () < 2) return (void *)-1; - rhs[0].off += extra_off; - rhs[0].op0 = int_const_binop (PLUS_EXPR, rhs[0].op0, - build_int_cst (TREE_TYPE (rhs[0].op0), - extra_off)); + int ix = rhs.length () - 2; + if (rhs[ix].opcode != MEM_REF + || known_eq (rhs[ix].off, -1)) + return (void *)-1; + rhs[ix].off += extra_off; + rhs[ix].op0 = int_const_binop (PLUS_EXPR, rhs[ix].op0, + build_int_cst (TREE_TYPE (rhs[ix].op0), + extra_off)); } /* We need to pre-pend vr->operands[0..i] to rhs. */ |