diff options
Diffstat (limited to 'gcc/tree-ssa-dom.c')
| -rw-r--r-- | gcc/tree-ssa-dom.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c index 68338206a8a..4715592746c 100644 --- a/gcc/tree-ssa-dom.c +++ b/gcc/tree-ssa-dom.c @@ -2559,6 +2559,20 @@ propagate_rhs_into_lhs (gimple stmt, tree lhs, tree rhs, bitmap interesting_name continue; } + /* It's not ok to propagate into the definition stmt of RHS. + <bb 9>: + # prephitmp.12_36 = PHI <g_67.1_6(9)> + g_67.1_6 = prephitmp.12_36; + goto <bb 9>; + While this is strictly all dead code we do not want to + deal with this here. */ + if (TREE_CODE (rhs) == SSA_NAME + && SSA_NAME_DEF_STMT (rhs) == use_stmt) + { + all = false; + continue; + } + /* Dump details. */ if (dump_file && (dump_flags & TDF_DETAILS)) { |