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| author | Marc Glisse <marc.glisse@inria.fr> | 2013-06-12 19:56:30 +0200 |
|---|---|---|
| committer | Marc Glisse <glisse@gcc.gnu.org> | 2013-06-12 17:56:30 +0000 |
| commit | 1951f1016cd8eec62db59a76840bde6a61d53ad4 (patch) | |
| tree | 324bf4aca8069a6f23641b2b376e381099a0ca1e /gcc/tree-ssa-dse.c | |
| parent | 8b033a8a927afab88532af22bdb7cd87d57e1f6d (diff) | |
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re PR tree-optimization/57361 (Remove self memory assignment)
2013-06-12 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/57361
gcc/
* tree-ssa-dse.c (dse_possible_dead_store_p): Handle self-assignment.
gcc/testsuite/
* gcc.dg/tree-ssa/pr57361.c: New file.
From-SVN: r200034
Diffstat (limited to 'gcc/tree-ssa-dse.c')
| -rw-r--r-- | gcc/tree-ssa-dse.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/tree-ssa-dse.c b/gcc/tree-ssa-dse.c index ad99ea9..39f47ab 100644 --- a/gcc/tree-ssa-dse.c +++ b/gcc/tree-ssa-dse.c @@ -84,6 +84,13 @@ dse_possible_dead_store_p (gimple stmt, gimple *use_stmt) *use_stmt = NULL; + /* Self-assignments are zombies. */ + if (operand_equal_p (gimple_assign_rhs1 (stmt), gimple_assign_lhs (stmt), 0)) + { + *use_stmt = stmt; + return true; + } + /* Find the first dominated statement that clobbers (part of) the memory stmt stores to with no intermediate statement that may use part of the memory stmt stores. That is, find a store that may |