diff options
| -rw-r--r-- | gcc/local-alloc.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/local-alloc.c b/gcc/local-alloc.c index 6f9c796d93c..8e75aa80488 100644 --- a/gcc/local-alloc.c +++ b/gcc/local-alloc.c @@ -2364,8 +2364,12 @@ no_conflict_p (insn, r0, r1) if (find_reg_note (p, REG_DEAD, r1)) ok = 1; - if (reg_mentioned_p (r1, PATTERN (p)) - && ! find_reg_note (p, REG_NO_CONFLICT, r1)) + /* There must be a REG_NO_CONFLICT note on every insn, otherwise + some earlier optimization pass has inserted instructions into + the sequence, and it is not safe to perform this optimization. + Note that emit_no_conflict_block always ensures that this is + true when these sequences are created. */ + if (! find_reg_note (p, REG_NO_CONFLICT, r1)) return 0; } |