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| author | Catherine Moore <clm@cygnus.com> | 1998-04-06 10:49:13 +0000 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 1998-04-06 03:49:13 -0700 |
| commit | d276f2bb0c9b6e5d73ff879433f8a3616ff08373 (patch) | |
| tree | 18eca73ba61813c4a0c66ba3359383e5a9687123 /gcc/combine.c | |
| parent | 64ad9df2cee59d28fe1c49abdf0a5b1254fa7b30 (diff) | |
| download | gcc-d276f2bb0c9b6e5d73ff879433f8a3616ff08373.tar.gz | |
combine.c (can_combine_p): Include successor in volatile test.
Mon Apr 6 07:17:52 1998 Catherine Moore <clm@cygnus.com>
* combine.c (can_combine_p): Include successor in volatile test.
From-SVN: r19018
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 8a03a3ded67..c831be1052a 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. */ |