| // Copyright 2022 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| package main | |
| import ( | |
| "fmt" | |
| "os" | |
| ) | |
| //go:noinline | |
| func f(x float64) float64 { | |
| return x | |
| } | |
| func inlineFma(x, y, z float64) float64 { | |
| return x + y*z | |
| } | |
| func main() { | |
| w, x, y := 1.0, 1.0, 1.0 | |
| x = f(x + x/(1<<52)) | |
| w = f(w / (1 << 27)) | |
| y = f(y + y/(1<<52)) | |
| w0 := f(2 * w * (1 - w)) | |
| w1 := f(w * (1 + w)) | |
| x = x + w0*w1 | |
| x = inlineFma(x, w0, w1) | |
| y = y + f(w0*w1) | |
| y = y + f(w0*w1) | |
| fmt.Println(x, y, x-y) | |
| if x != y { | |
| os.Exit(1) | |
| } | |
| } | |