mirror of
https://github.com/golang/go.git
synced 2025-12-08 06:10:04 +00:00
744ebfde04
This is a crude compiler pass to eliminate stores to auto variables
that are only ever written to.
Eliminates an unnecessary store to x from the following code:
func f() int {
var x := 1
return *(&x)
}
Fixes #19765.
Change-Id: If2c63a8ae67b8c590b6e0cc98a9610939a3eeffa
Reviewed-on: https://go-review.googlesource.com/38746
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
1859 lines
29 KiB
Go
1859 lines
29 KiB
Go
// Copyright 2016 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 gc
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import (
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"bytes"
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"fmt"
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"internal/testenv"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"runtime"
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"strings"
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"testing"
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)
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// This file contains code generation tests.
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//
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// Each test is defined in a variable of type asmTest. Tests are
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// architecture-specific, and they are grouped in arrays of tests, one
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// for each architecture.
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//
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// Each asmTest consists in a function to be compiled and an array of
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// regexps that will be matched to the generated assembly. For
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// example, the following amd64 test
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//
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// {
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// `
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// func f0(x int) int {
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// return x * 64
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// }
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// `,
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// []string{"\tSHLQ\t[$]6,"},
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// }
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//
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// verifies that the code the compiler generates for a multiplication
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// by 64 contains a 'SHLQ' instruction.
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//
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// Since all the tests for a given architecture are dumped in the same
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// file, the function names must be unique. As a workaround for this
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// restriction, the test harness supports the use of a '$' placeholder
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// for function names. The func f0 above can be also written as
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//
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// {
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// `
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// func $(x int) int {
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// return x * 64
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// }
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// `,
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// []string{"\tSHLQ\t[$]6,"},
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// }
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//
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// Each '$'-function will be given a unique name of form f<N>_<arch>,
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// where <N> is the test index in the test array, and <arch> is the
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// test's architecture.
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//
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// It is allowed to mix named and unnamed functions in the same test
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// array; the named function will retain their original names.
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// TestAssembly checks to make sure the assembly generated for
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// functions contains certain expected instructions.
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func TestAssembly(t *testing.T) {
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testenv.MustHaveGoBuild(t)
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if runtime.GOOS == "windows" {
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// TODO: remove if we can get "go tool compile -S" to work on windows.
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t.Skipf("skipping test: recursive windows compile not working")
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}
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dir, err := ioutil.TempDir("", "TestAssembly")
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if err != nil {
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t.Fatalf("could not create directory: %v", err)
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}
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defer os.RemoveAll(dir)
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nameRegexp := regexp.MustCompile("func \\w+")
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t.Run("platform", func(t *testing.T) {
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for _, ats := range allAsmTests {
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ats := ats
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t.Run(ats.os+"/"+ats.arch, func(tt *testing.T) {
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tt.Parallel()
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asm := ats.compileToAsm(tt, dir)
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for i, at := range ats.tests {
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var funcName string
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if strings.Contains(at.function, "func $") {
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funcName = fmt.Sprintf("f%d_%s", i, ats.arch)
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} else {
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funcName = nameRegexp.FindString(at.function)[len("func "):]
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}
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fa := funcAsm(tt, asm, funcName)
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if fa != "" {
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at.verifyAsm(tt, fa)
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}
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}
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})
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}
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})
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}
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var nextTextRegexp = regexp.MustCompile(`\n\S`)
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// funcAsm returns the assembly listing for the given function name.
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func funcAsm(t *testing.T, asm string, funcName string) string {
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if i := strings.Index(asm, fmt.Sprintf("TEXT\t\"\".%s(SB)", funcName)); i >= 0 {
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asm = asm[i:]
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} else {
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t.Errorf("could not find assembly for function %v", funcName)
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return ""
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}
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// Find the next line that doesn't begin with whitespace.
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loc := nextTextRegexp.FindStringIndex(asm)
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if loc != nil {
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asm = asm[:loc[0]]
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}
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return asm
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}
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type asmTest struct {
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// function to compile
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function string
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// regexps that must match the generated assembly
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regexps []string
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}
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func (at asmTest) verifyAsm(t *testing.T, fa string) {
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for _, r := range at.regexps {
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if b, err := regexp.MatchString(r, fa); !b || err != nil {
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t.Errorf("expected:%s\ngo:%s\nasm:%s\n", r, at.function, fa)
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}
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}
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}
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type asmTests struct {
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arch string
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os string
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imports []string
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tests []*asmTest
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}
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func (ats *asmTests) generateCode() []byte {
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var buf bytes.Buffer
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fmt.Fprintln(&buf, "package main")
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for _, s := range ats.imports {
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fmt.Fprintf(&buf, "import %q\n", s)
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}
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for i, t := range ats.tests {
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function := strings.Replace(t.function, "func $", fmt.Sprintf("func f%d_%s", i, ats.arch), 1)
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fmt.Fprintln(&buf, function)
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}
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return buf.Bytes()
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}
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// compile compiles the package pkg for architecture arch and
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// returns the generated assembly. dir is a scratch directory.
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func (ats *asmTests) compileToAsm(t *testing.T, dir string) string {
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// create test directory
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testDir := filepath.Join(dir, fmt.Sprintf("%s_%s", ats.arch, ats.os))
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err := os.Mkdir(testDir, 0700)
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if err != nil {
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t.Fatalf("could not create directory: %v", err)
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}
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// Create source.
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src := filepath.Join(testDir, "test.go")
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err = ioutil.WriteFile(src, ats.generateCode(), 0600)
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if err != nil {
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t.Fatalf("error writing code: %v", err)
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}
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// First, install any dependencies we need. This builds the required export data
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// for any packages that are imported.
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for _, i := range ats.imports {
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out := filepath.Join(testDir, i+".a")
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if s := ats.runGo(t, "build", "-o", out, "-gcflags=-dolinkobj=false", i); s != "" {
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t.Fatalf("Stdout = %s\nWant empty", s)
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}
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}
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// Now, compile the individual file for which we want to see the generated assembly.
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asm := ats.runGo(t, "tool", "compile", "-I", testDir, "-S", "-o", filepath.Join(testDir, "out.o"), src)
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return asm
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}
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// runGo runs go command with the given args and returns stdout string.
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// go is run with GOARCH and GOOS set as ats.arch and ats.os respectively
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func (ats *asmTests) runGo(t *testing.T, args ...string) string {
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var stdout, stderr bytes.Buffer
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cmd := exec.Command(testenv.GoToolPath(t), args...)
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cmd.Env = append(os.Environ(), "GOARCH="+ats.arch, "GOOS="+ats.os)
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cmd.Stdout = &stdout
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cmd.Stderr = &stderr
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if err := cmd.Run(); err != nil {
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t.Fatalf("error running cmd: %v\nstdout:\n%sstderr:\n%s\n", err, stdout.String(), stderr.String())
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}
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if s := stderr.String(); s != "" {
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t.Fatalf("Stderr = %s\nWant empty", s)
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}
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return stdout.String()
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}
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var allAsmTests = []*asmTests{
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{
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arch: "amd64",
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os: "linux",
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imports: []string{"encoding/binary", "math/bits", "unsafe"},
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tests: linuxAMD64Tests,
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},
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{
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arch: "386",
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os: "linux",
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imports: []string{"encoding/binary"},
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tests: linux386Tests,
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},
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{
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arch: "s390x",
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os: "linux",
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imports: []string{"encoding/binary", "math/bits"},
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tests: linuxS390XTests,
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},
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{
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arch: "arm",
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os: "linux",
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imports: []string{"math/bits"},
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tests: linuxARMTests,
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},
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{
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arch: "arm64",
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os: "linux",
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imports: []string{"math/bits"},
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tests: linuxARM64Tests,
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},
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{
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arch: "mips",
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os: "linux",
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imports: []string{"math/bits"},
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tests: linuxMIPSTests,
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},
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{
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arch: "ppc64le",
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os: "linux",
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tests: linuxPPC64LETests,
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},
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}
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var linuxAMD64Tests = []*asmTest{
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{
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`
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func f0(x int) int {
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return x * 64
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}
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`,
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[]string{"\tSHLQ\t\\$6,"},
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},
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{
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`
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func f1(x int) int {
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return x * 96
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}
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`,
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[]string{"\tSHLQ\t\\$5,", "\tLEAQ\t\\(.*\\)\\(.*\\*2\\),"},
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},
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// Load-combining tests.
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{
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`
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func f2(b []byte) uint64 {
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return binary.LittleEndian.Uint64(b)
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}
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`,
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[]string{"\tMOVQ\t\\(.*\\),"},
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},
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{
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`
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func f3(b []byte, i int) uint64 {
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return binary.LittleEndian.Uint64(b[i:])
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}
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`,
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[]string{"\tMOVQ\t\\(.*\\)\\(.*\\*1\\),"},
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},
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{
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`
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func f4(b []byte) uint32 {
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return binary.LittleEndian.Uint32(b)
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}
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`,
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[]string{"\tMOVL\t\\(.*\\),"},
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},
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{
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`
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func f5(b []byte, i int) uint32 {
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return binary.LittleEndian.Uint32(b[i:])
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}
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`,
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[]string{"\tMOVL\t\\(.*\\)\\(.*\\*1\\),"},
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},
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{
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`
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func f6(b []byte) uint64 {
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return binary.BigEndian.Uint64(b)
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}
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`,
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[]string{"\tBSWAPQ\t"},
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},
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{
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`
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func f7(b []byte, i int) uint64 {
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return binary.BigEndian.Uint64(b[i:])
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}
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`,
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[]string{"\tBSWAPQ\t"},
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},
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{
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`
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func f8(b []byte, v uint64) {
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binary.BigEndian.PutUint64(b, v)
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}
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`,
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[]string{"\tBSWAPQ\t"},
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},
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{
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`
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func f9(b []byte, i int, v uint64) {
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binary.BigEndian.PutUint64(b[i:], v)
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}
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`,
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[]string{"\tBSWAPQ\t"},
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},
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{
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`
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func f10(b []byte) uint32 {
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return binary.BigEndian.Uint32(b)
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}
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`,
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[]string{"\tBSWAPL\t"},
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},
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{
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`
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func f11(b []byte, i int) uint32 {
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return binary.BigEndian.Uint32(b[i:])
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}
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`,
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[]string{"\tBSWAPL\t"},
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},
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{
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`
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func f12(b []byte, v uint32) {
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binary.BigEndian.PutUint32(b, v)
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}
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`,
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[]string{"\tBSWAPL\t"},
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},
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{
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`
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func f13(b []byte, i int, v uint32) {
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binary.BigEndian.PutUint32(b[i:], v)
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}
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`,
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[]string{"\tBSWAPL\t"},
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},
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{
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`
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func f14(b []byte) uint16 {
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return binary.BigEndian.Uint16(b)
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}
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`,
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[]string{"\tROLW\t\\$8,"},
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},
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{
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`
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func f15(b []byte, i int) uint16 {
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return binary.BigEndian.Uint16(b[i:])
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}
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`,
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[]string{"\tROLW\t\\$8,"},
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},
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{
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`
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func f16(b []byte, v uint16) {
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binary.BigEndian.PutUint16(b, v)
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}
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`,
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[]string{"\tROLW\t\\$8,"},
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},
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{
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`
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func f17(b []byte, i int, v uint16) {
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binary.BigEndian.PutUint16(b[i:], v)
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}
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`,
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[]string{"\tROLW\t\\$8,"},
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},
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// Structure zeroing. See issue #18370.
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{
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`
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type T1 struct {
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a, b, c int
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}
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func $(t *T1) {
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*t = T1{}
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}
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`,
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[]string{"\tXORPS\tX., X", "\tMOVUPS\tX., \\(.*\\)", "\tMOVQ\t\\$0, 16\\(.*\\)"},
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},
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// SSA-able composite literal initialization. Issue 18872.
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{
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`
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type T18872 struct {
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a, b, c, d int
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}
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func f18872(p *T18872) {
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*p = T18872{1, 2, 3, 4}
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}
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`,
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[]string{"\tMOVQ\t[$]1", "\tMOVQ\t[$]2", "\tMOVQ\t[$]3", "\tMOVQ\t[$]4"},
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},
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// Also test struct containing pointers (this was special because of write barriers).
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{
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`
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type T2 struct {
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a, b, c *int
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}
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func f19(t *T2) {
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*t = T2{}
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}
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`,
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[]string{"\tXORPS\tX., X", "\tMOVUPS\tX., \\(.*\\)", "\tMOVQ\t\\$0, 16\\(.*\\)", "\tCALL\truntime\\.writebarrierptr\\(SB\\)"},
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},
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// Rotate tests
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{
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`
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func f20(x uint64) uint64 {
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return x<<7 | x>>57
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}
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`,
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[]string{"\tROLQ\t[$]7,"},
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},
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{
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|
`
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func f21(x uint64) uint64 {
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return x<<7 + x>>57
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}
|
|
`,
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[]string{"\tROLQ\t[$]7,"},
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|
},
|
|
{
|
|
`
|
|
func f22(x uint64) uint64 {
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return x<<7 ^ x>>57
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}
|
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`,
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[]string{"\tROLQ\t[$]7,"},
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},
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{
|
|
`
|
|
func f23(x uint32) uint32 {
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return x<<7 + x>>25
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}
|
|
`,
|
|
[]string{"\tROLL\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f24(x uint32) uint32 {
|
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return x<<7 | x>>25
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}
|
|
`,
|
|
[]string{"\tROLL\t[$]7,"},
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|
},
|
|
{
|
|
`
|
|
func f25(x uint32) uint32 {
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return x<<7 ^ x>>25
|
|
}
|
|
`,
|
|
[]string{"\tROLL\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f26(x uint16) uint16 {
|
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return x<<7 + x>>9
|
|
}
|
|
`,
|
|
[]string{"\tROLW\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f27(x uint16) uint16 {
|
|
return x<<7 | x>>9
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|
}
|
|
`,
|
|
[]string{"\tROLW\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f28(x uint16) uint16 {
|
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return x<<7 ^ x>>9
|
|
}
|
|
`,
|
|
[]string{"\tROLW\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f29(x uint8) uint8 {
|
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return x<<7 + x>>1
|
|
}
|
|
`,
|
|
[]string{"\tROLB\t[$]7,"},
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|
},
|
|
{
|
|
`
|
|
func f30(x uint8) uint8 {
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return x<<7 | x>>1
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}
|
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`,
|
|
[]string{"\tROLB\t[$]7,"},
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|
},
|
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{
|
|
`
|
|
func f31(x uint8) uint8 {
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return x<<7 ^ x>>1
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|
}
|
|
`,
|
|
[]string{"\tROLB\t[$]7,"},
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|
},
|
|
// Rotate after inlining (see issue 18254).
|
|
{
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|
`
|
|
func f32(x uint32) uint32 {
|
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return g(x, 7)
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}
|
|
func g(x uint32, k uint) uint32 {
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|
return x<<k | x>>(32-k)
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|
}
|
|
`,
|
|
[]string{"\tROLL\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f33(m map[int]int) int {
|
|
return m[5]
|
|
}
|
|
`,
|
|
[]string{"\tMOVQ\t[$]5,"},
|
|
},
|
|
// Direct use of constants in fast map access calls. Issue 19015.
|
|
{
|
|
`
|
|
func f34(m map[int]int) bool {
|
|
_, ok := m[5]
|
|
return ok
|
|
}
|
|
`,
|
|
[]string{"\tMOVQ\t[$]5,"},
|
|
},
|
|
{
|
|
`
|
|
func f35(m map[string]int) int {
|
|
return m["abc"]
|
|
}
|
|
`,
|
|
[]string{"\"abc\""},
|
|
},
|
|
{
|
|
`
|
|
func f36(m map[string]int) bool {
|
|
_, ok := m["abc"]
|
|
return ok
|
|
}
|
|
`,
|
|
[]string{"\"abc\""},
|
|
},
|
|
// Bit test ops on amd64, issue 18943.
|
|
{
|
|
`
|
|
func f37(a, b uint64) int {
|
|
if a&(1<<(b&63)) != 0 {
|
|
return 1
|
|
}
|
|
return -1
|
|
}
|
|
`,
|
|
[]string{"\tBTQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f38(a, b uint64) bool {
|
|
return a&(1<<(b&63)) != 0
|
|
}
|
|
`,
|
|
[]string{"\tBTQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f39(a uint64) int {
|
|
if a&(1<<60) != 0 {
|
|
return 1
|
|
}
|
|
return -1
|
|
}
|
|
`,
|
|
[]string{"\tBTQ\t\\$60"},
|
|
},
|
|
{
|
|
`
|
|
func f40(a uint64) bool {
|
|
return a&(1<<60) != 0
|
|
}
|
|
`,
|
|
[]string{"\tBTQ\t\\$60"},
|
|
},
|
|
// Intrinsic tests for math/bits
|
|
{
|
|
`
|
|
func f41(a uint64) int {
|
|
return bits.TrailingZeros64(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSFQ\t", "\tMOVL\t\\$64,", "\tCMOVQEQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f42(a uint32) int {
|
|
return bits.TrailingZeros32(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSFQ\t", "\tORQ\t[^$]", "\tMOVQ\t\\$4294967296,"},
|
|
},
|
|
{
|
|
`
|
|
func f43(a uint16) int {
|
|
return bits.TrailingZeros16(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSFQ\t", "\tORQ\t\\$65536,"},
|
|
},
|
|
{
|
|
`
|
|
func f44(a uint8) int {
|
|
return bits.TrailingZeros8(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSFQ\t", "\tORQ\t\\$256,"},
|
|
},
|
|
{
|
|
`
|
|
func f45(a uint64) uint64 {
|
|
return bits.ReverseBytes64(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSWAPQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f46(a uint32) uint32 {
|
|
return bits.ReverseBytes32(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSWAPL\t"},
|
|
},
|
|
{
|
|
`
|
|
func f47(a uint16) uint16 {
|
|
return bits.ReverseBytes16(a)
|
|
}
|
|
`,
|
|
[]string{"\tROLW\t\\$8,"},
|
|
},
|
|
{
|
|
`
|
|
func f48(a uint64) int {
|
|
return bits.Len64(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f49(a uint32) int {
|
|
return bits.Len32(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f50(a uint16) int {
|
|
return bits.Len16(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
/* see ssa.go
|
|
{
|
|
`
|
|
func f51(a uint8) int {
|
|
return bits.Len8(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
*/
|
|
{
|
|
`
|
|
func f52(a uint) int {
|
|
return bits.Len(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f53(a uint64) int {
|
|
return bits.LeadingZeros64(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f54(a uint32) int {
|
|
return bits.LeadingZeros32(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f55(a uint16) int {
|
|
return bits.LeadingZeros16(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
/* see ssa.go
|
|
{
|
|
`
|
|
func f56(a uint8) int {
|
|
return bits.LeadingZeros8(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
*/
|
|
{
|
|
`
|
|
func f57(a uint) int {
|
|
return bits.LeadingZeros(a)
|
|
}
|
|
`,
|
|
[]string{"\tBSRQ\t"},
|
|
},
|
|
{
|
|
`
|
|
func pop1(x uint64) int {
|
|
return bits.OnesCount64(x)
|
|
}`,
|
|
[]string{"\tPOPCNTQ\t", "support_popcnt"},
|
|
},
|
|
{
|
|
`
|
|
func pop2(x uint32) int {
|
|
return bits.OnesCount32(x)
|
|
}`,
|
|
[]string{"\tPOPCNTL\t", "support_popcnt"},
|
|
},
|
|
{
|
|
`
|
|
func pop3(x uint16) int {
|
|
return bits.OnesCount16(x)
|
|
}`,
|
|
[]string{"\tPOPCNTL\t", "support_popcnt"},
|
|
},
|
|
{
|
|
`
|
|
func pop4(x uint) int {
|
|
return bits.OnesCount(x)
|
|
}`,
|
|
[]string{"\tPOPCNTQ\t", "support_popcnt"},
|
|
},
|
|
// multiplication merging tests
|
|
{
|
|
`
|
|
func mul1(n int) int {
|
|
return 15*n + 31*n
|
|
}`,
|
|
[]string{"\tIMULQ\t[$]46"}, // 46*n
|
|
},
|
|
{
|
|
`
|
|
func mul2(n int) int {
|
|
return 5*n + 7*(n+1) + 11*(n+2)
|
|
}`,
|
|
[]string{"\tIMULQ\t[$]23", "\tADDQ\t[$]29"}, // 23*n + 29
|
|
},
|
|
{
|
|
`
|
|
func mul3(a, n int) int {
|
|
return a*n + 19*n
|
|
}`,
|
|
[]string{"\tADDQ\t[$]19", "\tIMULQ"}, // (a+19)*n
|
|
},
|
|
|
|
// see issue 19595.
|
|
// We want to merge load+op in f58, but not in f59.
|
|
{
|
|
`
|
|
func f58(p, q *int) {
|
|
x := *p
|
|
*q += x
|
|
}`,
|
|
[]string{"\tADDQ\t\\("},
|
|
},
|
|
{
|
|
`
|
|
func f59(p, q *int) {
|
|
x := *p
|
|
for i := 0; i < 10; i++ {
|
|
*q += x
|
|
}
|
|
}`,
|
|
[]string{"\tADDQ\t[A-Z]"},
|
|
},
|
|
// Floating-point strength reduction
|
|
{
|
|
`
|
|
func f60(f float64) float64 {
|
|
return f * 2.0
|
|
}`,
|
|
[]string{"\tADDSD\t"},
|
|
},
|
|
{
|
|
`
|
|
func f62(f float64) float64 {
|
|
return f / 16.0
|
|
}`,
|
|
[]string{"\tMULSD\t"},
|
|
},
|
|
{
|
|
`
|
|
func f63(f float64) float64 {
|
|
return f / 0.125
|
|
}`,
|
|
[]string{"\tMULSD\t"},
|
|
},
|
|
{
|
|
`
|
|
func f64(f float64) float64 {
|
|
return f / 0.5
|
|
}`,
|
|
[]string{"\tADDSD\t"},
|
|
},
|
|
// Check that compare to constant string uses 2/4/8 byte compares
|
|
{
|
|
`
|
|
func f65(a string) bool {
|
|
return a == "xx"
|
|
}`,
|
|
[]string{"\tCMPW\t[A-Z]"},
|
|
},
|
|
{
|
|
`
|
|
func f66(a string) bool {
|
|
return a == "xxxx"
|
|
}`,
|
|
[]string{"\tCMPL\t[A-Z]"},
|
|
},
|
|
{
|
|
`
|
|
func f67(a string) bool {
|
|
return a == "xxxxxxxx"
|
|
}`,
|
|
[]string{"\tCMPQ\t[A-Z]"},
|
|
},
|
|
// Non-constant rotate
|
|
{
|
|
`func rot64l(x uint64, y int) uint64 {
|
|
z := uint(y & 63)
|
|
return x << z | x >> (64-z)
|
|
}`,
|
|
[]string{"\tROLQ\t"},
|
|
},
|
|
{
|
|
`func rot64r(x uint64, y int) uint64 {
|
|
z := uint(y & 63)
|
|
return x >> z | x << (64-z)
|
|
}`,
|
|
[]string{"\tRORQ\t"},
|
|
},
|
|
{
|
|
`func rot32l(x uint32, y int) uint32 {
|
|
z := uint(y & 31)
|
|
return x << z | x >> (32-z)
|
|
}`,
|
|
[]string{"\tROLL\t"},
|
|
},
|
|
{
|
|
`func rot32r(x uint32, y int) uint32 {
|
|
z := uint(y & 31)
|
|
return x >> z | x << (32-z)
|
|
}`,
|
|
[]string{"\tRORL\t"},
|
|
},
|
|
{
|
|
`func rot16l(x uint16, y int) uint16 {
|
|
z := uint(y & 15)
|
|
return x << z | x >> (16-z)
|
|
}`,
|
|
[]string{"\tROLW\t"},
|
|
},
|
|
{
|
|
`func rot16r(x uint16, y int) uint16 {
|
|
z := uint(y & 15)
|
|
return x >> z | x << (16-z)
|
|
}`,
|
|
[]string{"\tRORW\t"},
|
|
},
|
|
{
|
|
`func rot8l(x uint8, y int) uint8 {
|
|
z := uint(y & 7)
|
|
return x << z | x >> (8-z)
|
|
}`,
|
|
[]string{"\tROLB\t"},
|
|
},
|
|
{
|
|
`func rot8r(x uint8, y int) uint8 {
|
|
z := uint(y & 7)
|
|
return x >> z | x << (8-z)
|
|
}`,
|
|
[]string{"\tRORB\t"},
|
|
},
|
|
// Check that array compare uses 2/4/8 byte compares
|
|
{
|
|
`
|
|
func f68(a,b [2]byte) bool {
|
|
return a == b
|
|
}`,
|
|
[]string{"\tCMPW\t[A-Z]"},
|
|
},
|
|
{
|
|
`
|
|
func f69(a,b [3]uint16) bool {
|
|
return a == b
|
|
}`,
|
|
[]string{"\tCMPL\t[A-Z]"},
|
|
},
|
|
{
|
|
`
|
|
func f70(a,b [15]byte) bool {
|
|
return a == b
|
|
}`,
|
|
[]string{"\tCMPQ\t[A-Z]"},
|
|
},
|
|
{
|
|
`
|
|
func f71(a,b unsafe.Pointer) bool { // This was a TODO in mapaccess1_faststr
|
|
return *((*[4]byte)(a)) != *((*[4]byte)(b))
|
|
}`,
|
|
[]string{"\tCMPL\t[A-Z]"},
|
|
},
|
|
{
|
|
// make sure assembly output has matching offset and base register.
|
|
`
|
|
func f72(a, b int) int {
|
|
//go:noinline
|
|
func() {_, _ = a, b} () // use some frame
|
|
return b
|
|
}
|
|
`,
|
|
[]string{"b\\+40\\(SP\\)"},
|
|
},
|
|
{
|
|
// check that stack store is optimized away
|
|
`
|
|
func $() int {
|
|
var x int
|
|
return *(&x)
|
|
}
|
|
`,
|
|
[]string{"TEXT\t.*, [$]0-8"},
|
|
},
|
|
}
|
|
|
|
var linux386Tests = []*asmTest{
|
|
{
|
|
`
|
|
func f0(b []byte) uint32 {
|
|
return binary.LittleEndian.Uint32(b)
|
|
}
|
|
`,
|
|
[]string{"\tMOVL\t\\(.*\\),"},
|
|
},
|
|
{
|
|
`
|
|
func f1(b []byte, i int) uint32 {
|
|
return binary.LittleEndian.Uint32(b[i:])
|
|
}
|
|
`,
|
|
[]string{"\tMOVL\t\\(.*\\)\\(.*\\*1\\),"},
|
|
},
|
|
|
|
// multiplication merging tests
|
|
{
|
|
`
|
|
func $(n int) int {
|
|
return 9*n + 14*n
|
|
}`,
|
|
[]string{"\tIMULL\t[$]23"}, // 23*n
|
|
},
|
|
{
|
|
`
|
|
func $(a, n int) int {
|
|
return 19*a + a*n
|
|
}`,
|
|
[]string{"\tADDL\t[$]19", "\tIMULL"}, // (n+19)*a
|
|
},
|
|
{
|
|
// check that stack store is optimized away
|
|
`
|
|
func $() int {
|
|
var x int
|
|
return *(&x)
|
|
}
|
|
`,
|
|
[]string{"TEXT\t.*, [$]0-4"},
|
|
},
|
|
}
|
|
|
|
var linuxS390XTests = []*asmTest{
|
|
{
|
|
`
|
|
func f0(b []byte) uint32 {
|
|
return binary.LittleEndian.Uint32(b)
|
|
}
|
|
`,
|
|
[]string{"\tMOVWBR\t\\(.*\\),"},
|
|
},
|
|
{
|
|
`
|
|
func f1(b []byte, i int) uint32 {
|
|
return binary.LittleEndian.Uint32(b[i:])
|
|
}
|
|
`,
|
|
[]string{"\tMOVWBR\t\\(.*\\)\\(.*\\*1\\),"},
|
|
},
|
|
{
|
|
`
|
|
func f2(b []byte) uint64 {
|
|
return binary.LittleEndian.Uint64(b)
|
|
}
|
|
`,
|
|
[]string{"\tMOVDBR\t\\(.*\\),"},
|
|
},
|
|
{
|
|
`
|
|
func f3(b []byte, i int) uint64 {
|
|
return binary.LittleEndian.Uint64(b[i:])
|
|
}
|
|
`,
|
|
[]string{"\tMOVDBR\t\\(.*\\)\\(.*\\*1\\),"},
|
|
},
|
|
{
|
|
`
|
|
func f4(b []byte) uint32 {
|
|
return binary.BigEndian.Uint32(b)
|
|
}
|
|
`,
|
|
[]string{"\tMOVWZ\t\\(.*\\),"},
|
|
},
|
|
{
|
|
`
|
|
func f5(b []byte, i int) uint32 {
|
|
return binary.BigEndian.Uint32(b[i:])
|
|
}
|
|
`,
|
|
[]string{"\tMOVWZ\t\\(.*\\)\\(.*\\*1\\),"},
|
|
},
|
|
{
|
|
`
|
|
func f6(b []byte) uint64 {
|
|
return binary.BigEndian.Uint64(b)
|
|
}
|
|
`,
|
|
[]string{"\tMOVD\t\\(.*\\),"},
|
|
},
|
|
{
|
|
`
|
|
func f7(b []byte, i int) uint64 {
|
|
return binary.BigEndian.Uint64(b[i:])
|
|
}
|
|
`,
|
|
[]string{"\tMOVD\t\\(.*\\)\\(.*\\*1\\),"},
|
|
},
|
|
{
|
|
`
|
|
func f8(x uint64) uint64 {
|
|
return x<<7 + x>>57
|
|
}
|
|
`,
|
|
[]string{"\tRLLG\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f9(x uint64) uint64 {
|
|
return x<<7 | x>>57
|
|
}
|
|
`,
|
|
[]string{"\tRLLG\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f10(x uint64) uint64 {
|
|
return x<<7 ^ x>>57
|
|
}
|
|
`,
|
|
[]string{"\tRLLG\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f11(x uint32) uint32 {
|
|
return x<<7 + x>>25
|
|
}
|
|
`,
|
|
[]string{"\tRLL\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f12(x uint32) uint32 {
|
|
return x<<7 | x>>25
|
|
}
|
|
`,
|
|
[]string{"\tRLL\t[$]7,"},
|
|
},
|
|
{
|
|
`
|
|
func f13(x uint32) uint32 {
|
|
return x<<7 ^ x>>25
|
|
}
|
|
`,
|
|
[]string{"\tRLL\t[$]7,"},
|
|
},
|
|
// Fused multiply-add/sub instructions.
|
|
{
|
|
`
|
|
func f14(x, y, z float64) float64 {
|
|
return x * y + z
|
|
}
|
|
`,
|
|
[]string{"\tFMADD\t"},
|
|
},
|
|
{
|
|
`
|
|
func f15(x, y, z float64) float64 {
|
|
return x * y - z
|
|
}
|
|
`,
|
|
[]string{"\tFMSUB\t"},
|
|
},
|
|
{
|
|
`
|
|
func f16(x, y, z float32) float32 {
|
|
return x * y + z
|
|
}
|
|
`,
|
|
[]string{"\tFMADDS\t"},
|
|
},
|
|
{
|
|
`
|
|
func f17(x, y, z float32) float32 {
|
|
return x * y - z
|
|
}
|
|
`,
|
|
[]string{"\tFMSUBS\t"},
|
|
},
|
|
// Intrinsic tests for math/bits
|
|
{
|
|
`
|
|
func f18(a uint64) int {
|
|
return bits.TrailingZeros64(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f19(a uint32) int {
|
|
return bits.TrailingZeros32(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t", "\tMOVWZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f20(a uint16) int {
|
|
return bits.TrailingZeros16(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t", "\tOR\t\\$65536,"},
|
|
},
|
|
{
|
|
`
|
|
func f21(a uint8) int {
|
|
return bits.TrailingZeros8(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t", "\tOR\t\\$256,"},
|
|
},
|
|
// Intrinsic tests for math/bits
|
|
{
|
|
`
|
|
func f22(a uint64) uint64 {
|
|
return bits.ReverseBytes64(a)
|
|
}
|
|
`,
|
|
[]string{"\tMOVDBR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f23(a uint32) uint32 {
|
|
return bits.ReverseBytes32(a)
|
|
}
|
|
`,
|
|
[]string{"\tMOVWBR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f24(a uint64) int {
|
|
return bits.Len64(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f25(a uint32) int {
|
|
return bits.Len32(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f26(a uint16) int {
|
|
return bits.Len16(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f27(a uint8) int {
|
|
return bits.Len8(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f28(a uint) int {
|
|
return bits.Len(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f29(a uint64) int {
|
|
return bits.LeadingZeros64(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f30(a uint32) int {
|
|
return bits.LeadingZeros32(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f31(a uint16) int {
|
|
return bits.LeadingZeros16(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f32(a uint8) int {
|
|
return bits.LeadingZeros8(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
`
|
|
func f33(a uint) int {
|
|
return bits.LeadingZeros(a)
|
|
}
|
|
`,
|
|
[]string{"\tFLOGR\t"},
|
|
},
|
|
{
|
|
// check that stack store is optimized away
|
|
`
|
|
func $() int {
|
|
var x int
|
|
return *(&x)
|
|
}
|
|
`,
|
|
[]string{"TEXT\t.*, [$]0-8"},
|
|
},
|
|
}
|
|
|
|
var linuxARMTests = []*asmTest{
|
|
{
|
|
`
|
|
func f0(x uint32) uint32 {
|
|
return x<<7 + x>>25
|
|
}
|
|
`,
|
|
[]string{"\tMOVW\tR[0-9]+@>25,"},
|
|
},
|
|
{
|
|
`
|
|
func f1(x uint32) uint32 {
|
|
return x<<7 | x>>25
|
|
}
|
|
`,
|
|
[]string{"\tMOVW\tR[0-9]+@>25,"},
|
|
},
|
|
{
|
|
`
|
|
func f2(x uint32) uint32 {
|
|
return x<<7 ^ x>>25
|
|
}
|
|
`,
|
|
[]string{"\tMOVW\tR[0-9]+@>25,"},
|
|
},
|
|
{
|
|
`
|
|
func f3(a uint64) int {
|
|
return bits.Len64(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f4(a uint32) int {
|
|
return bits.Len32(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f5(a uint16) int {
|
|
return bits.Len16(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f6(a uint8) int {
|
|
return bits.Len8(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f7(a uint) int {
|
|
return bits.Len(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f8(a uint64) int {
|
|
return bits.LeadingZeros64(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f9(a uint32) int {
|
|
return bits.LeadingZeros32(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f10(a uint16) int {
|
|
return bits.LeadingZeros16(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f11(a uint8) int {
|
|
return bits.LeadingZeros8(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f12(a uint) int {
|
|
return bits.LeadingZeros(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
// make sure assembly output has matching offset and base register.
|
|
`
|
|
func f13(a, b int) int {
|
|
//go:noinline
|
|
func() {_, _ = a, b} () // use some frame
|
|
return b
|
|
}
|
|
`,
|
|
[]string{"b\\+4\\(FP\\)"},
|
|
},
|
|
{
|
|
// check that stack store is optimized away
|
|
`
|
|
func $() int {
|
|
var x int
|
|
return *(&x)
|
|
}
|
|
`,
|
|
[]string{"TEXT\t.*, [$]-4-4"},
|
|
},
|
|
}
|
|
|
|
var linuxARM64Tests = []*asmTest{
|
|
{
|
|
`
|
|
func f0(x uint64) uint64 {
|
|
return x<<7 + x>>57
|
|
}
|
|
`,
|
|
[]string{"\tROR\t[$]57,"},
|
|
},
|
|
{
|
|
`
|
|
func f1(x uint64) uint64 {
|
|
return x<<7 | x>>57
|
|
}
|
|
`,
|
|
[]string{"\tROR\t[$]57,"},
|
|
},
|
|
{
|
|
`
|
|
func f2(x uint64) uint64 {
|
|
return x<<7 ^ x>>57
|
|
}
|
|
`,
|
|
[]string{"\tROR\t[$]57,"},
|
|
},
|
|
{
|
|
`
|
|
func f3(x uint32) uint32 {
|
|
return x<<7 + x>>25
|
|
}
|
|
`,
|
|
[]string{"\tRORW\t[$]25,"},
|
|
},
|
|
{
|
|
`
|
|
func f4(x uint32) uint32 {
|
|
return x<<7 | x>>25
|
|
}
|
|
`,
|
|
[]string{"\tRORW\t[$]25,"},
|
|
},
|
|
{
|
|
`
|
|
func f5(x uint32) uint32 {
|
|
return x<<7 ^ x>>25
|
|
}
|
|
`,
|
|
[]string{"\tRORW\t[$]25,"},
|
|
},
|
|
{
|
|
`
|
|
func f22(a uint64) uint64 {
|
|
return bits.ReverseBytes64(a)
|
|
}
|
|
`,
|
|
[]string{"\tREV\t"},
|
|
},
|
|
{
|
|
`
|
|
func f23(a uint32) uint32 {
|
|
return bits.ReverseBytes32(a)
|
|
}
|
|
`,
|
|
[]string{"\tREVW\t"},
|
|
},
|
|
{
|
|
`
|
|
func f24(a uint64) int {
|
|
return bits.Len64(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f25(a uint32) int {
|
|
return bits.Len32(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f26(a uint16) int {
|
|
return bits.Len16(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f27(a uint8) int {
|
|
return bits.Len8(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f28(a uint) int {
|
|
return bits.Len(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f29(a uint64) int {
|
|
return bits.LeadingZeros64(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f30(a uint32) int {
|
|
return bits.LeadingZeros32(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f31(a uint16) int {
|
|
return bits.LeadingZeros16(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f32(a uint8) int {
|
|
return bits.LeadingZeros8(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f33(a uint) int {
|
|
return bits.LeadingZeros(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f34(a uint64) uint64 {
|
|
return a & ((1<<63)-1)
|
|
}
|
|
`,
|
|
[]string{"\tAND\t"},
|
|
},
|
|
{
|
|
`
|
|
func f35(a uint64) uint64 {
|
|
return a & (1<<63)
|
|
}
|
|
`,
|
|
[]string{"\tAND\t"},
|
|
},
|
|
{
|
|
// make sure offsets are folded into load and store.
|
|
`
|
|
func f36(_, a [20]byte) (b [20]byte) {
|
|
b = a
|
|
return
|
|
}
|
|
`,
|
|
[]string{"\tMOVD\t\"\"\\.a\\+[0-9]+\\(FP\\), R[0-9]+", "\tMOVD\tR[0-9]+, \"\"\\.b\\+[0-9]+\\(FP\\)"},
|
|
},
|
|
{
|
|
// check that stack store is optimized away
|
|
`
|
|
func $() int {
|
|
var x int
|
|
return *(&x)
|
|
}
|
|
`,
|
|
[]string{"TEXT\t.*, [$]-8-8"},
|
|
},
|
|
}
|
|
|
|
var linuxMIPSTests = []*asmTest{
|
|
{
|
|
`
|
|
func f0(a uint64) int {
|
|
return bits.Len64(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f1(a uint32) int {
|
|
return bits.Len32(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f2(a uint16) int {
|
|
return bits.Len16(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f3(a uint8) int {
|
|
return bits.Len8(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f4(a uint) int {
|
|
return bits.Len(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f5(a uint64) int {
|
|
return bits.LeadingZeros64(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f6(a uint32) int {
|
|
return bits.LeadingZeros32(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f7(a uint16) int {
|
|
return bits.LeadingZeros16(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f8(a uint8) int {
|
|
return bits.LeadingZeros8(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
`
|
|
func f9(a uint) int {
|
|
return bits.LeadingZeros(a)
|
|
}
|
|
`,
|
|
[]string{"\tCLZ\t"},
|
|
},
|
|
{
|
|
// check that stack store is optimized away
|
|
`
|
|
func $() int {
|
|
var x int
|
|
return *(&x)
|
|
}
|
|
`,
|
|
[]string{"TEXT\t.*, [$]-4-4"},
|
|
},
|
|
}
|
|
|
|
var linuxPPC64LETests = []*asmTest{
|
|
// Fused multiply-add/sub instructions.
|
|
{
|
|
`
|
|
func f0(x, y, z float64) float64 {
|
|
return x * y + z
|
|
}
|
|
`,
|
|
[]string{"\tFMADD\t"},
|
|
},
|
|
{
|
|
`
|
|
func f1(x, y, z float64) float64 {
|
|
return x * y - z
|
|
}
|
|
`,
|
|
[]string{"\tFMSUB\t"},
|
|
},
|
|
{
|
|
`
|
|
func f2(x, y, z float32) float32 {
|
|
return x * y + z
|
|
}
|
|
`,
|
|
[]string{"\tFMADDS\t"},
|
|
},
|
|
{
|
|
`
|
|
func f3(x, y, z float32) float32 {
|
|
return x * y - z
|
|
}
|
|
`,
|
|
[]string{"\tFMSUBS\t"},
|
|
},
|
|
{
|
|
`
|
|
func f4(x uint32) uint32 {
|
|
return x<<7 | x>>25
|
|
}
|
|
`,
|
|
[]string{"\tROTLW\t"},
|
|
},
|
|
{
|
|
`
|
|
func f5(x uint32) uint32 {
|
|
return x<<7 + x>>25
|
|
}
|
|
`,
|
|
[]string{"\tROTLW\t"},
|
|
},
|
|
{
|
|
`
|
|
func f6(x uint32) uint32 {
|
|
return x<<7 ^ x>>25
|
|
}
|
|
`,
|
|
[]string{"\tROTLW\t"},
|
|
},
|
|
{
|
|
`
|
|
func f7(x uint64) uint64 {
|
|
return x<<7 | x>>57
|
|
}
|
|
`,
|
|
[]string{"\tROTL\t"},
|
|
},
|
|
{
|
|
`
|
|
func f8(x uint64) uint64 {
|
|
return x<<7 + x>>57
|
|
}
|
|
`,
|
|
[]string{"\tROTL\t"},
|
|
},
|
|
{
|
|
`
|
|
func f9(x uint64) uint64 {
|
|
return x<<7 ^ x>>57
|
|
}
|
|
`,
|
|
[]string{"\tROTL\t"},
|
|
},
|
|
{
|
|
// check that stack store is optimized away
|
|
`
|
|
func $() int {
|
|
var x int
|
|
return *(&x)
|
|
}
|
|
`,
|
|
[]string{"TEXT\t.*, [$]0-8"},
|
|
},
|
|
}
|
|
|
|
// TestLineNumber checks to make sure the generated assembly has line numbers
|
|
// see issue #16214
|
|
func TestLineNumber(t *testing.T) {
|
|
testenv.MustHaveGoBuild(t)
|
|
dir, err := ioutil.TempDir("", "TestLineNumber")
|
|
if err != nil {
|
|
t.Fatalf("could not create directory: %v", err)
|
|
}
|
|
defer os.RemoveAll(dir)
|
|
|
|
src := filepath.Join(dir, "x.go")
|
|
err = ioutil.WriteFile(src, []byte(issue16214src), 0644)
|
|
if err != nil {
|
|
t.Fatalf("could not write file: %v", err)
|
|
}
|
|
|
|
cmd := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-S", "-o", filepath.Join(dir, "out.o"), src)
|
|
out, err := cmd.CombinedOutput()
|
|
if err != nil {
|
|
t.Fatalf("fail to run go tool compile: %v", err)
|
|
}
|
|
|
|
if strings.Contains(string(out), "unknown line number") {
|
|
t.Errorf("line number missing in assembly:\n%s", out)
|
|
}
|
|
}
|
|
|
|
var issue16214src = `
|
|
package main
|
|
|
|
func Mod32(x uint32) uint32 {
|
|
return x % 3 // frontend rewrites it as HMUL with 2863311531, the LITERAL node has unknown Pos
|
|
}
|
|
`
|