blob: 08ec638f44ef7105d2dad1db5631c17fff5a2f79 [file] [log] [blame]
// Copyright 2016 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 gc
import (
"bytes"
"fmt"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"strings"
"testing"
)
// TestAssembly checks to make sure the assembly generated for
// functions contains certain expected instructions.
func TestAssembly(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "windows" {
// TODO: remove if we can get "go tool compile -S" to work on windows.
t.Skipf("skipping test: recursive windows compile not working")
}
dir, err := ioutil.TempDir("", "TestAssembly")
if err != nil {
t.Fatalf("could not create directory: %v", err)
}
defer os.RemoveAll(dir)
nameRegexp := regexp.MustCompile("func \\w+")
t.Run("platform", func(t *testing.T) {
for _, ats := range allAsmTests {
ats := ats
t.Run(ats.os+"/"+ats.arch, func(tt *testing.T) {
tt.Parallel()
asm := ats.compileToAsm(tt, dir)
for _, at := range ats.tests {
funcName := nameRegexp.FindString(at.function)[len("func "):]
fa := funcAsm(tt, asm, funcName)
if fa != "" {
at.verifyAsm(tt, fa)
}
}
})
}
})
}
var nextTextRegexp = regexp.MustCompile(`\n\S`)
// funcAsm returns the assembly listing for the given function name.
func funcAsm(t *testing.T, asm string, funcName string) string {
if i := strings.Index(asm, fmt.Sprintf("TEXT\t\"\".%s(SB)", funcName)); i >= 0 {
asm = asm[i:]
} else {
t.Errorf("could not find assembly for function %v", funcName)
return ""
}
// Find the next line that doesn't begin with whitespace.
loc := nextTextRegexp.FindStringIndex(asm)
if loc != nil {
asm = asm[:loc[0]]
}
return asm
}
type asmTest struct {
// function to compile, must be named fX,
// where X is this test's index in asmTests.tests.
function string
// regexps that must match the generated assembly
regexps []string
}
func (at asmTest) verifyAsm(t *testing.T, fa string) {
for _, r := range at.regexps {
if b, err := regexp.MatchString(r, fa); !b || err != nil {
t.Errorf("expected:%s\ngo:%s\nasm:%s\n", r, at.function, fa)
}
}
}
type asmTests struct {
arch string
os string
imports []string
tests []*asmTest
}
func (ats *asmTests) generateCode() []byte {
var buf bytes.Buffer
fmt.Fprintln(&buf, "package main")
for _, s := range ats.imports {
fmt.Fprintf(&buf, "import %q\n", s)
}
for _, t := range ats.tests {
fmt.Fprintln(&buf, t.function)
}
return buf.Bytes()
}
// compile compiles the package pkg for architecture arch and
// returns the generated assembly. dir is a scratch directory.
func (ats *asmTests) compileToAsm(t *testing.T, dir string) string {
// create test directory
testDir := filepath.Join(dir, fmt.Sprintf("%s_%s", ats.arch, ats.os))
err := os.Mkdir(testDir, 0700)
if err != nil {
t.Fatalf("could not create directory: %v", err)
}
// Create source.
src := filepath.Join(testDir, "test.go")
err = ioutil.WriteFile(src, ats.generateCode(), 0600)
if err != nil {
t.Fatalf("error writing code: %v", err)
}
// First, install any dependencies we need. This builds the required export data
// for any packages that are imported.
for _, i := range ats.imports {
out := filepath.Join(testDir, i+".a")
if s := ats.runGo(t, "build", "-o", out, "-gcflags=-dolinkobj=false", i); s != "" {
t.Fatalf("Stdout = %s\nWant empty", s)
}
}
// Now, compile the individual file for which we want to see the generated assembly.
asm := ats.runGo(t, "tool", "compile", "-I", testDir, "-S", "-o", filepath.Join(testDir, "out.o"), src)
return asm
}
// runGo runs go command with the given args and returns stdout string.
// go is run with GOARCH and GOOS set as ats.arch and ats.os respectively
func (ats *asmTests) runGo(t *testing.T, args ...string) string {
var stdout, stderr bytes.Buffer
cmd := exec.Command(testenv.GoToolPath(t), args...)
cmd.Env = append(os.Environ(), "GOARCH="+ats.arch, "GOOS="+ats.os)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
t.Fatalf("error running cmd: %v\nstdout:\n%sstderr:\n%s\n", err, stdout.String(), stderr.String())
}
if s := stderr.String(); s != "" {
t.Fatalf("Stderr = %s\nWant empty", s)
}
return stdout.String()
}
var allAsmTests = []*asmTests{
{
arch: "amd64",
os: "linux",
imports: []string{"encoding/binary", "math/bits", "unsafe"},
tests: linuxAMD64Tests,
},
{
arch: "386",
os: "linux",
imports: []string{"encoding/binary"},
tests: linux386Tests,
},
{
arch: "s390x",
os: "linux",
imports: []string{"encoding/binary", "math/bits"},
tests: linuxS390XTests,
},
{
arch: "arm",
os: "linux",
imports: []string{"math/bits"},
tests: linuxARMTests,
},
{
arch: "arm64",
os: "linux",
imports: []string{"math/bits"},
tests: linuxARM64Tests,
},
{
arch: "mips",
os: "linux",
imports: []string{"math/bits"},
tests: linuxMIPSTests,
},
{
arch: "ppc64le",
os: "linux",
tests: linuxPPC64LETests,
},
}
var linuxAMD64Tests = []*asmTest{
{
`
func f0(x int) int {
return x * 64
}
`,
[]string{"\tSHLQ\t\\$6,"},
},
{
`
func f1(x int) int {
return x * 96
}
`,
[]string{"\tSHLQ\t\\$5,", "\tLEAQ\t\\(.*\\)\\(.*\\*2\\),"},
},
// Load-combining tests.
{
`
func f2(b []byte) uint64 {
return binary.LittleEndian.Uint64(b)
}
`,
[]string{"\tMOVQ\t\\(.*\\),"},
},
{
`
func f3(b []byte, i int) uint64 {
return binary.LittleEndian.Uint64(b[i:])
}
`,
[]string{"\tMOVQ\t\\(.*\\)\\(.*\\*1\\),"},
},
{
`
func f4(b []byte) uint32 {
return binary.LittleEndian.Uint32(b)
}
`,
[]string{"\tMOVL\t\\(.*\\),"},
},
{
`
func f5(b []byte, i int) uint32 {
return binary.LittleEndian.Uint32(b[i:])
}
`,
[]string{"\tMOVL\t\\(.*\\)\\(.*\\*1\\),"},
},
{
`
func f6(b []byte) uint64 {
return binary.BigEndian.Uint64(b)
}
`,
[]string{"\tBSWAPQ\t"},
},
{
`
func f7(b []byte, i int) uint64 {
return binary.BigEndian.Uint64(b[i:])
}
`,
[]string{"\tBSWAPQ\t"},
},
{
`
func f8(b []byte, v uint64) {
binary.BigEndian.PutUint64(b, v)
}
`,
[]string{"\tBSWAPQ\t"},
},
{
`
func f9(b []byte, i int, v uint64) {
binary.BigEndian.PutUint64(b[i:], v)
}
`,
[]string{"\tBSWAPQ\t"},
},
{
`
func f10(b []byte) uint32 {
return binary.BigEndian.Uint32(b)
}
`,
[]string{"\tBSWAPL\t"},
},
{
`
func f11(b []byte, i int) uint32 {
return binary.BigEndian.Uint32(b[i:])
}
`,
[]string{"\tBSWAPL\t"},
},
{
`
func f12(b []byte, v uint32) {
binary.BigEndian.PutUint32(b, v)
}
`,
[]string{"\tBSWAPL\t"},
},
{
`
func f13(b []byte, i int, v uint32) {
binary.BigEndian.PutUint32(b[i:], v)
}
`,
[]string{"\tBSWAPL\t"},
},
{
`
func f14(b []byte) uint16 {
return binary.BigEndian.Uint16(b)
}
`,
[]string{"\tROLW\t\\$8,"},
},
{
`
func f15(b []byte, i int) uint16 {
return binary.BigEndian.Uint16(b[i:])
}
`,
[]string{"\tROLW\t\\$8,"},
},
{
`
func f16(b []byte, v uint16) {
binary.BigEndian.PutUint16(b, v)
}
`,
[]string{"\tROLW\t\\$8,"},
},
{
`
func f17(b []byte, i int, v uint16) {
binary.BigEndian.PutUint16(b[i:], v)
}
`,
[]string{"\tROLW\t\\$8,"},
},
// Structure zeroing. See issue #18370.
{
`
type T1 struct {
a, b, c int
}
func f18(t *T1) {
*t = T1{}
}
`,
[]string{"\tMOVQ\t\\$0, \\(.*\\)", "\tMOVQ\t\\$0, 8\\(.*\\)", "\tMOVQ\t\\$0, 16\\(.*\\)"},
},
// SSA-able composite literal initialization. Issue 18872.
{
`
type T18872 struct {
a, b, c, d int
}
func f18872(p *T18872) {
*p = T18872{1, 2, 3, 4}
}
`,
[]string{"\tMOVQ\t[$]1", "\tMOVQ\t[$]2", "\tMOVQ\t[$]3", "\tMOVQ\t[$]4"},
},
// Also test struct containing pointers (this was special because of write barriers).
{
`
type T2 struct {
a, b, c *int
}
func f19(t *T2) {
*t = T2{}
}
`,
[]string{"\tMOVQ\t\\$0, \\(.*\\)", "\tMOVQ\t\\$0, 8\\(.*\\)", "\tMOVQ\t\\$0, 16\\(.*\\)", "\tCALL\truntime\\.writebarrierptr\\(SB\\)"},
},
// Rotate tests
{
`
func f20(x uint64) uint64 {
return x<<7 | x>>57
}
`,
[]string{"\tROLQ\t[$]7,"},
},
{
`
func f21(x uint64) uint64 {
return x<<7 + x>>57
}
`,
[]string{"\tROLQ\t[$]7,"},
},
{
`
func f22(x uint64) uint64 {
return x<<7 ^ x>>57
}
`,
[]string{"\tROLQ\t[$]7,"},
},
{
`
func f23(x uint32) uint32 {
return x<<7 + x>>25
}
`,
[]string{"\tROLL\t[$]7,"},
},
{
`
func f24(x uint32) uint32 {
return x<<7 | x>>25
}
`,
[]string{"\tROLL\t[$]7,"},
},
{
`
func f25(x uint32) uint32 {
return x<<7 ^ x>>25
}
`,
[]string{"\tROLL\t[$]7,"},
},
{
`
func f26(x uint16) uint16 {
return x<<7 + x>>9
}
`,
[]string{"\tROLW\t[$]7,"},
},
{
`
func f27(x uint16) uint16 {
return x<<7 | x>>9
}
`,
[]string{"\tROLW\t[$]7,"},
},
{
`
func f28(x uint16) uint16 {
return x<<7 ^ x>>9
}
`,
[]string{"\tROLW\t[$]7,"},
},
{
`
func f29(x uint8) uint8 {
return x<<7 + x>>1
}
`,
[]string{"\tROLB\t[$]7,"},
},
{
`
func f30(x uint8) uint8 {
return x<<7 | x>>1
}
`,
[]string{"\tROLB\t[$]7,"},
},
{
`
func f31(x uint8) uint8 {
return x<<7 ^ x>>1
}
`,
[]string{"\tROLB\t[$]7,"},
},
// Rotate after inlining (see issue 18254).
{
`
func f32(x uint32) uint32 {
return g(x, 7)
}
func g(x uint32, k uint) uint32 {
return x<<k | x>>(32-k)
}
`,
[]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"},
},
// 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 {
var x [16]byte // use some frame
_ = x
return b
}
`,
[]string{"b\\+40\\(SP\\)"},
},
}
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\\),"},
},
}
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"},
},
}
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 {
var x [16]byte // use some frame
_ = x
return b
}
`,
[]string{"b\\+4\\(FP\\)"},
},
}
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\\)"},
},
}
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"},
},
}
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"},
},
}
// 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
}
`