diff options
Diffstat (limited to 'amd64')
| -rw-r--r-- | amd64/emit.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/amd64/emit.c b/amd64/emit.c index 128d8ad..6121f5e 100644 --- a/amd64/emit.c +++ b/amd64/emit.c @@ -1012,7 +1012,11 @@ emitinstr(uchar **pcode, struct function *fn, struct block *blk, int curi, struc if (kisflt(cls)) { Xaddf(pcode, cls, dst, mkimmdatregoper(ins->r)); } else if (ins->reg-1 == dst.reg) { /* two-address add */ - Xadd(pcode, cls, dst, ref2oper(ins->r)); + src = ref2oper(ins->r); + if (src.t == OIMM && src.imm < 0) /* ADD -imm -> SUB imm, for niceness */ + Xsub(pcode, cls, dst, (src.imm = -src.imm, src)); + else + Xadd(pcode, cls, dst, src); } else if (isregref(ins->r) && ins->reg-1 == mkregoper(ins->r).reg) { /* also two-address after swapping operands */ Xadd(pcode, cls, reg2oper(ins->reg-1), mkimmdatregoper(ins->l)); |