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| author | Jim Wilson <wilson@gcc.gnu.org> | 1997-04-03 15:08:40 -0800 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1997-04-03 15:08:40 -0800 |
| commit | 8bb196585a6673cb5f3f82d98f89c21281877584 (patch) | |
| tree | e88701a0cba537d8c6d50c443063325dc7cb750b /gcc/local-alloc.c | |
| parent | 3dbc43d13a314775b13218b9180fb74059c18f53 (diff) | |
| download | gcc-8bb196585a6673cb5f3f82d98f89c21281877584.tar.gz | |
(no_conflict_p): Reject sequences with foreign insns.
From-SVN: r13838
Diffstat (limited to 'gcc/local-alloc.c')
| -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; } |