| // 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) |
| } |
| } |
