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| author | Richard Stallman <rms@gnu.org> | 1993-10-19 04:42:27 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1993-10-19 04:42:27 +0000 |
| commit | 4b2cb4a29542e58e001ac110a9969925ece7065a (patch) | |
| tree | ff769c66ea9f3e5b329adb8fcdbbe270ee1331c5 | |
| parent | d97c4a16408502927e02ad2f3b6a872d5800975a (diff) | |
| download | gcc-4b2cb4a29542e58e001ac110a9969925ece7065a.zip gcc-4b2cb4a29542e58e001ac110a9969925ece7065a.tar.gz gcc-4b2cb4a29542e58e001ac110a9969925ece7065a.tar.bz2 | |
(can_combine_p): Don't combine instructions across a volatile insn.
From-SVN: r5802
| -rw-r--r-- | gcc/combine.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index bee4d53..fd55947 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -927,6 +927,14 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc) && p != succ && volatile_refs_p (PATTERN (p))) return 0; + /* If there are any volatile insns between INSN and I3, reject, because + they might affect machine state. */ + + for (p = NEXT_INSN (insn); p != i3; p = NEXT_INSN (p)) + if (GET_RTX_CLASS (GET_CODE (p)) == 'i' + && p != succ && volatile_insn_p (PATTERN (p))) + return 0; + /* If INSN or I2 contains an autoincrement or autodecrement, make sure that register is not used between there and I3, and not already used in I3 either. |