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// 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 ssa_test
import (
"internal/testenv"
"path/filepath"
"regexp"
"runtime"
"testing"
)
// TestFmaHash checks that the hash-test machinery works properly for a single case.
// It also runs ssa/check and gccheck to be sure that those are checked at least a
// little in each run.bash. It does not check or run the generated code.
// The test file is however a useful example of fused-vs-cascaded multiply-add.
func TestFmaHash(t *testing.T) {
switch runtime.GOOS {
case "linux", "darwin":
default:
t.Skipf("Slow test, usually avoid it, os=%s not linux or darwin", runtime.GOOS)
}
switch runtime.GOARCH {
case "amd64", "arm64":
default:
t.Skipf("Slow test, usually avoid it, arch=%s not amd64 or arm64", runtime.GOARCH)
}
testenv.MustHaveGoBuild(t)
gocmd := testenv.GoToolPath(t)
tmpdir := t.TempDir()
source := filepath.Join("testdata", "fma.go")
output := filepath.Join(tmpdir, "fma.exe")
cmd := testenv.Command(t, gocmd, "build", "-o", output, source)
// The hash-dependence on file path name is dodged by specifying "all hashes ending in 1" plus "all hashes ending in 0"
// i.e., all hashes. This will print all the FMAs; this test is only interested in one of them (that should appear near the end).
cmd.Env = append(cmd.Env, "GOCOMPILEDEBUG=fmahash=1/0", "GOOS=linux", "GOARCH=arm64", "HOME="+tmpdir)
t.Logf("%v", cmd)
t.Logf("%v", cmd.Env)
b, e := cmd.CombinedOutput()
if e != nil {
t.Error(e)
}
s := string(b) // Looking for "GOFMAHASH triggered main.main:24"
re := "fmahash(0?) triggered .*fma.go:29:..;.*fma.go:18:.."
match := regexp.MustCompile(re)
if !match.MatchString(s) {
t.Errorf("Expected to match '%s' with \n-----\n%s-----", re, s)
}
}