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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 |