diff options
| author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 1997-10-16 22:06:43 +0000 |
|---|---|---|
| committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 1997-10-16 22:06:43 +0000 |
| commit | 5ba0e4da0ed90514c968eb0730b4a24bbb611740 (patch) | |
| tree | f7106aca95b69b471bb0493600b7fc23327305f4 /gcc/combine.c | |
| parent | 3af966eb115278ae073932614bf42328941970a4 (diff) | |
| download | gcc-5ba0e4da0ed90514c968eb0730b4a24bbb611740.tar.gz | |
* combine.c (can_combine_p): Don't combine with an asm whose
output is a hard register.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@15940 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 2ef88c09f52..3626e48e975 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1003,6 +1003,13 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc) && 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. */ + + if (GET_CODE (src) == ASM_OPERANDS + && GET_CODE (dest) == REG && REGNO (dest) < FIRST_PSEUDO_REGISTER) + return 0; + /* If there are any volatile insns between INSN and I3, reject, because they might affect machine state. */ |