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(can_combine_p): Don't combine instructions across a volatile insn.

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From-SVN: r5802
This commit is contained in:
Richard Stallman 1993-10-19 04:42:27 +00:00
parent d97c4a1640
commit 4b2cb4a295
1 changed files with 8 additions and 0 deletions
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8
gcc/combine.c
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@ -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.