diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 8a03a3d..c831be1 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1037,14 +1037,19 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc) return 0; /* If INSN contains anything volatile, or is an `asm' (whether volatile - or not), reject, unless nothing volatile comes between it and I3, - with the exception of SUCC. */ + or not), reject, unless nothing volatile comes between it and I3 */ if (GET_CODE (src) == ASM_OPERANDS || volatile_refs_p (src)) - for (p = NEXT_INSN (insn); p != i3; p = NEXT_INSN (p)) - if (GET_RTX_CLASS (GET_CODE (p)) == 'i' - && p != succ && volatile_refs_p (PATTERN (p))) - return 0; + { + /* Make sure succ doesn't contain a volatile reference. */ + if (succ != 0 && volatile_refs_p (PATTERN (succ))) + return 0; + + for (p = NEXT_INSN (insn); p != i3; p = NEXT_INSN (p)) + if (GET_RTX_CLASS (GET_CODE (p)) == 'i' + && p != succ && volatile_refs_p (PATTERN (p))) + return 0; + } /* If INSN is an asm, and DEST is a hard register, reject, since it has to be an explicit register variable, and was chosen for a reason. */ |