fix broken code produced for ominus
go/test: passes 89% (308/345)
R=rsc
APPROVED=rsc
DELTA=10 (5 added, 0 deleted, 5 changed)
OCL=36005
CL=36021
diff --git a/src/cmd/5g/cgen.c b/src/cmd/5g/cgen.c
index bba552f..347a530 100644
--- a/src/cmd/5g/cgen.c
+++ b/src/cmd/5g/cgen.c
@@ -222,11 +222,16 @@
goto ret;
case OMINUS:
- nr = nl;
- nl = &n1;
- nodconst(nl, nr->type, 0);
- a = optoas(OSUB, nr->type);
- goto abop;
+ nodconst(&n3, nl->type, 0);
+ regalloc(&n2, nl->type, res);
+ regalloc(&n1, nl->type, N);
+ gmove(&n3, &n2);
+ cgen(nl, &n1);
+ gins(optoas(OSUB, nl->type), &n1, &n2);
+ gmove(&n2, res);
+ regfree(&n1);
+ regfree(&n2);
+ goto ret;
// symmetric binary
case OAND:
