ssa: fix multi result

ssa/ssa_test.go

@@ -370,8 +370,13 @@ source_filename = "foo/bar"
 
 define { i64, double } @fn(double %0) {
 _llgo_0:
-  %mrv = insertvalue { i64, double } { ptr @a, double poison }, double %0, 1
-  ret { i64, double } %mrv
+  %1 = alloca { i64, double }, align 8
+  %2 = getelementptr inbounds { i64, double }, ptr %1, i32 0, i32 0
+  store ptr @a, ptr %2, align 8
+  %3 = getelementptr inbounds { i64, double }, ptr %1, i32 0, i32 1
+  store double %0, ptr %3, align 8
+  %4 = load { i64, double }, ptr %1, align 8
+  ret { i64, double } %4
 }
 `)
 }

ssa/stmt_builder.go

@@ -177,7 +177,14 @@ func (b Builder) Return(results ...Expr) {
 		b.impl.CreateRet(ret.impl)
 	default:
 		tret := b.Func.raw.Type.(*types.Signature).Results()
-		b.impl.CreateAggregateRet(llvmParams(0, results, tret, b))
+		n := tret.Len()
+		typs := make([]Type, n)
+		for i := 0; i < n; i++ {
+			typs[i] = b.Prog.Type(tret.At(i).Type(), InC)
+		}
+		typ := b.Prog.Struct(typs...)
+		expr := b.aggregateValue(typ, llvmParams(0, results, tret, b)...)
+		b.impl.CreateRet(expr.impl)
 	}
 }