1// run
2
3//go:build !wasm
4
5// Copyright 2021 The Go Authors. All rights reserved.
6// Use of this source code is governed by a BSD-style
7// license that can be found in the LICENSE file.
8
9// wasm is excluded because the compiler chatter about register abi pragma ends up
10// on stdout, and causes the expected output to not match.
11
12package main
13
14import "fmt"
15
16type i4 struct {
17	a, b, c, d int
18}
19
20//go:registerparams
21//go:noinline
22func F(x i4) i4 {
23	ab := x.a + x.b
24	bc := x.b + x.c
25	cd := x.c + x.d
26	ad := x.a + x.d
27	ba := x.a - x.b
28	cb := x.b - x.c
29	dc := x.c - x.d
30	da := x.a - x.d
31
32	return i4{ab*bc + da, cd*ad + cb, ba*cb + ad, dc*da + bc}
33}
34
35func main() {
36	x := i4{1, 2, 3, 4}
37	y := x
38	z := F(x)
39	if (i4{12, 34, 6, 8}) != z {
40		fmt.Printf("y=%v, z=%v\n", y, z)
41	}
42}
43