arm64/abi: fix big aggregates passed on the stack

The riscv test abi8.ssa caught a bug
in the arm backend. It turns out we
were using the wrong class when loading
pointers to aggregates from the stack.

The fix is simple and mirrors what is
done in the riscv abi.

1 files changed, 4 insertions, 8 deletions

diff --git a/arm64/abi.c b/arm64/abi.c
index 6ed393d..b6b4612 100644
--- a/arm64/abi.c
+++ b/arm64/abi.c
@@ -100,6 +100,9 @@ typclass(Class *c, Typ *t, int *gp, int *fp)
 		 * memory */
 		c->class |= Cptr;
 		c->size = 8;
+		c->ngp = 1;
+		*c->reg = *gp;
+		*c->cls = Kl;
 		return;
 	}
 
@@ -230,14 +233,7 @@ argsclass(Ins *i0, Ins *i1, Class *carg, Ref *env)
 		case Oparc:
 		case Oargc:
 			typclass(c, &typ[i->arg[0].val], gp, fp);
-			if (c->class & Cptr) {
-				if (ngp > 0) {
-					ngp--;
-					*c->reg = *gp++;
-					*c->cls = Kl;
-					break;
-				}
-			} else if (c->ngp <= ngp) {
+			if (c->ngp <= ngp) {
 				if (c->nfp <= nfp) {
 					ngp -= c->ngp;
 					nfp -= c->nfp;