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Diffstat (limited to 'gcc/tree-ssa-copy.c')
| -rw-r--r-- | gcc/tree-ssa-copy.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/gcc/tree-ssa-copy.c b/gcc/tree-ssa-copy.c index 91d80a7aef9..b9544f88979 100644 --- a/gcc/tree-ssa-copy.c +++ b/gcc/tree-ssa-copy.c @@ -626,9 +626,16 @@ copy_prop_visit_cond_stmt (tree stmt, edge *taken_edge_p) print_generic_stmt (dump_file, cond, 0); } - *taken_edge_p = find_taken_edge (bb_for_stmt (stmt), cond); - if (*taken_edge_p) - retval = SSA_PROP_INTERESTING; + /* We can fold COND only and get a useful result only when we + have the same SSA_NAME on both sides of a comparison + operator. */ + if (TREE_CODE (TREE_OPERAND (cond, 0)) == SSA_NAME + && TREE_OPERAND (cond, 0) == TREE_OPERAND (cond, 1)) + { + *taken_edge_p = find_taken_edge (bb_for_stmt (stmt), fold (cond)); + if (*taken_edge_p) + retval = SSA_PROP_INTERESTING; + } /* Restore the original operands. */ for (i = 0; i < NUM_USES (uses); i++) |