diff options
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. */ |