diff options
Diffstat (limited to 'gcc/tree-predcom.c')
| -rw-r--r-- | gcc/tree-predcom.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/tree-predcom.c b/gcc/tree-predcom.c index 5c90fb1..4e54713 100644 --- a/gcc/tree-predcom.c +++ b/gcc/tree-predcom.c @@ -1932,7 +1932,13 @@ eliminate_temp_copies (struct loop *loop, bitmap tmp_vars) /* Base all the ssa names in the ud and du chain of NAME on VAR. */ stmt = SSA_NAME_DEF_STMT (use); - while (TREE_CODE (stmt) == PHI_NODE) + while (TREE_CODE (stmt) == PHI_NODE + /* In case we could not unroll the loop enough to eliminate + all copies, we may reach the loop header before the defining + statement (in that case, some register copies will be present + in loop latch in the final code, corresponding to the newly + created looparound phi nodes). */ + && bb_for_stmt (stmt) != loop->header) { gcc_assert (single_pred_p (bb_for_stmt (stmt))); use = PHI_ARG_DEF (stmt, 0); |