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9d59b42d1f
With the removal of SSE2 runtime detection made in golang.org/cl/344350 we can remove this mechanism as there are no required features anymore. For making sure CPUs running a go program support all the minimal hardware requirements the go runtime should do feature checks early in the runtime initialization before it is likely any compiler emitted but unsupported instructions are used. This is already the case for e.g. checking MMX support on 386 arch targets. Change-Id: If7b1cb6f43233841e917d37a18314d06a334a734 Reviewed-on: https://go-review.googlesource.com/c/go/+/354209 Trust: Martin Möhrmann <martin@golang.org> Run-TryBot: Martin Möhrmann <martin@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Keith Randall <khr@golang.org>
65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cpu_test
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import (
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. "internal/cpu"
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"internal/testenv"
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"os"
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"os/exec"
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"strings"
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"testing"
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)
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func MustHaveDebugOptionsSupport(t *testing.T) {
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if !DebugOptions {
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t.Skipf("skipping test: cpu feature options not supported by OS")
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}
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}
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func MustSupportFeatureDectection(t *testing.T) {
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// TODO: add platforms that do not have CPU feature detection support.
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}
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func runDebugOptionsTest(t *testing.T, test string, options string) {
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MustHaveDebugOptionsSupport(t)
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testenv.MustHaveExec(t)
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env := "GODEBUG=" + options
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cmd := exec.Command(os.Args[0], "-test.run="+test)
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cmd.Env = append(cmd.Env, env)
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output, err := cmd.CombinedOutput()
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lines := strings.Fields(string(output))
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lastline := lines[len(lines)-1]
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got := strings.TrimSpace(lastline)
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want := "PASS"
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if err != nil || got != want {
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t.Fatalf("%s with %s: want %s, got %v", test, env, want, got)
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}
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}
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func TestDisableAllCapabilities(t *testing.T) {
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MustSupportFeatureDectection(t)
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runDebugOptionsTest(t, "TestAllCapabilitiesDisabled", "cpu.all=off")
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}
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func TestAllCapabilitiesDisabled(t *testing.T) {
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MustHaveDebugOptionsSupport(t)
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if os.Getenv("GODEBUG") != "cpu.all=off" {
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t.Skipf("skipping test: GODEBUG=cpu.all=off not set")
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}
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for _, o := range Options {
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want := false
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if got := *o.Feature; got != want {
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t.Errorf("%v: expected %v, got %v", o.Name, want, got)
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}
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}
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}
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