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Diffstat (limited to 'gcc/tree-ssa-dce.c')
| -rw-r--r-- | gcc/tree-ssa-dce.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/tree-ssa-dce.c b/gcc/tree-ssa-dce.c index 8c3dd8f..75aaee9 100644 --- a/gcc/tree-ssa-dce.c +++ b/gcc/tree-ssa-dce.c @@ -462,7 +462,8 @@ mark_aliased_reaching_defs_necessary_1 (ao_ref *ref, tree vdef, void *data) gimple *def_stmt = SSA_NAME_DEF_STMT (vdef); /* All stmts we visit are necessary. */ - mark_operand_necessary (vdef); + if (! gimple_clobber_p (def_stmt)) + mark_operand_necessary (vdef); /* If the stmt lhs kills ref, then we can stop walking. */ if (gimple_has_lhs (def_stmt) @@ -584,7 +585,8 @@ mark_all_reaching_defs_necessary_1 (ao_ref *ref ATTRIBUTE_UNUSED, } } - mark_operand_necessary (vdef); + if (! gimple_clobber_p (def_stmt)) + mark_operand_necessary (vdef); return false; } |