leaf2.go

     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  
    12  package main
    13  
    14  import "fmt"
    15  
    16  type i4 struct {
    17  	a, b, c, d int
    18  }
    19  
    20  //go:registerparams
    21  //go:noinline
    22  func 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  
    35  func 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
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