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rewrite_test.go
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// 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 ssa
import (
"cmd/compile/internal/rttype"
"reflect"
"testing"
"unsafe"
)
// We generate memmove for copy(x[1:], x[:]), however we may change it to OpMove,
// because size is known. Check that OpMove is alias-safe, or we did call memmove.
func TestMove(t *testing.T) {
x := [...]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40}
copy(x[1:], x[:])
for i := 1; i < len(x); i++ {
if int(x[i]) != i {
t.Errorf("Memmove got converted to OpMove in alias-unsafe way. Got %d instead of %d in position %d", int(x[i]), i, i+1)
}
}
}
func TestMoveSmall(t *testing.T) {
x := [...]byte{1, 2, 3, 4, 5, 6, 7}
copy(x[1:], x[:])
for i := 1; i < len(x); i++ {
if int(x[i]) != i {
t.Errorf("Memmove got converted to OpMove in alias-unsafe way. Got %d instead of %d in position %d", int(x[i]), i, i+1)
}
}
}
func TestSubFlags(t *testing.T) {
if !subFlags32(0, 1).lt() {
t.Errorf("subFlags32(0,1).lt() returned false")
}
if !subFlags32(0, 1).ult() {
t.Errorf("subFlags32(0,1).ult() returned false")
}
}
func TestIsPPC64WordRotateMask(t *testing.T) {
tests := []struct {
input int64
expected bool
}{
{0x00000001, true},
{0x80000001, true},
{0x80010001, false},
{0xFFFFFFFA, false},
{0xF0F0F0F0, false},
{0xFFFFFFFD, true},
{0x80000000, true},
{0x00000000, false},
{0xFFFFFFFF, true},
{0x0000FFFF, true},
{0xFF0000FF, true},
{0x00FFFF00, true},
}
for _, v := range tests {
if v.expected != isPPC64WordRotateMask(v.input) {
t.Errorf("isPPC64WordRotateMask(0x%x) failed", v.input)
}
}
}
func TestEncodeDecodePPC64WordRotateMask(t *testing.T) {
tests := []struct {
rotate int64
mask uint64
nbits,
mb,
me,
encoded int64
}{
{1, 0x00000001, 32, 31, 31, 0x20011f20},
{2, 0x80000001, 32, 31, 0, 0x20021f01},
{3, 0xFFFFFFFD, 32, 31, 29, 0x20031f1e},
{4, 0x80000000, 32, 0, 0, 0x20040001},
{5, 0xFFFFFFFF, 32, 0, 31, 0x20050020},
{6, 0x0000FFFF, 32, 16, 31, 0x20061020},
{7, 0xFF0000FF, 32, 24, 7, 0x20071808},
{8, 0x00FFFF00, 32, 8, 23, 0x20080818},
{9, 0x0000000000FFFF00, 64, 40, 55, 0x40092838},
{10, 0xFFFF000000000000, 64, 0, 15, 0x400A0010},
{10, 0xFFFF000000000001, 64, 63, 15, 0x400A3f10},
}
for i, v := range tests {
result := encodePPC64RotateMask(v.rotate, int64(v.mask), v.nbits)
if result != v.encoded {
t.Errorf("encodePPC64RotateMask(%d,0x%x,%d) = 0x%x, expected 0x%x", v.rotate, v.mask, v.nbits, result, v.encoded)
}
rotate, mb, me, mask := DecodePPC64RotateMask(result)
if rotate != v.rotate || mb != v.mb || me != v.me || mask != v.mask {
t.Errorf("DecodePPC64Failure(Test %d) got (%d, %d, %d, %x) expected (%d, %d, %d, %x)", i, rotate, mb, me, mask, v.rotate, v.mb, v.me, v.mask)
}
}
}
func TestMergePPC64ClrlsldiSrw(t *testing.T) {
tests := []struct {
clrlsldi int32
srw int64
valid bool
rotate int64
mask uint64
}{
// ((x>>4)&0xFF)<<4
{newPPC64ShiftAuxInt(4, 56, 63, 64), 4, true, 0, 0xFF0},
// ((x>>4)&0xFFFF)<<4
{newPPC64ShiftAuxInt(4, 48, 63, 64), 4, true, 0, 0xFFFF0},
// ((x>>4)&0xFFFF)<<17
{newPPC64ShiftAuxInt(17, 48, 63, 64), 4, false, 0, 0},
// ((x>>4)&0xFFFF)<<16
{newPPC64ShiftAuxInt(16, 48, 63, 64), 4, true, 12, 0xFFFF0000},
// ((x>>32)&0xFFFF)<<17
{newPPC64ShiftAuxInt(17, 48, 63, 64), 32, false, 0, 0},
}
for i, v := range tests {
result := mergePPC64ClrlsldiSrw(int64(v.clrlsldi), v.srw)
if v.valid && result == 0 {
t.Errorf("mergePPC64ClrlsldiSrw(Test %d) did not merge", i)
} else if !v.valid && result != 0 {
t.Errorf("mergePPC64ClrlsldiSrw(Test %d) should return 0", i)
} else if r, _, _, m := DecodePPC64RotateMask(result); v.rotate != r || v.mask != m {
t.Errorf("mergePPC64ClrlsldiSrw(Test %d) got (%d,0x%x) expected (%d,0x%x)", i, r, m, v.rotate, v.mask)
}
}
}
func TestMergePPC64ClrlsldiRlwinm(t *testing.T) {
tests := []struct {
clrlsldi int32
rlwinm int64
valid bool
rotate int64
mask uint64
}{
// ((x<<4)&0xFF00)<<4
{newPPC64ShiftAuxInt(4, 56, 63, 64), encodePPC64RotateMask(4, 0xFF00, 32), false, 0, 0},
// ((x>>4)&0xFF)<<4
{newPPC64ShiftAuxInt(4, 56, 63, 64), encodePPC64RotateMask(28, 0x0FFFFFFF, 32), true, 0, 0xFF0},
// ((x>>4)&0xFFFF)<<4
{newPPC64ShiftAuxInt(4, 48, 63, 64), encodePPC64RotateMask(28, 0xFFFF, 32), true, 0, 0xFFFF0},
// ((x>>4)&0xFFFF)<<17
{newPPC64ShiftAuxInt(17, 48, 63, 64), encodePPC64RotateMask(28, 0xFFFF, 32), false, 0, 0},
// ((x>>4)&0xFFFF)<<16
{newPPC64ShiftAuxInt(16, 48, 63, 64), encodePPC64RotateMask(28, 0xFFFF, 32), true, 12, 0xFFFF0000},
// ((x>>4)&0xF000FFFF)<<16
{newPPC64ShiftAuxInt(16, 48, 63, 64), encodePPC64RotateMask(28, 0xF000FFFF, 32), true, 12, 0xFFFF0000},
}
for i, v := range tests {
result := mergePPC64ClrlsldiRlwinm(v.clrlsldi, v.rlwinm)
if v.valid && result == 0 {
t.Errorf("mergePPC64ClrlsldiRlwinm(Test %d) did not merge", i)
} else if !v.valid && result != 0 {
t.Errorf("mergePPC64ClrlsldiRlwinm(Test %d) should return 0", i)
} else if r, _, _, m := DecodePPC64RotateMask(result); v.rotate != r || v.mask != m {
t.Errorf("mergePPC64ClrlsldiRlwinm(Test %d) got (%d,0x%x) expected (%d,0x%x)", i, r, m, v.rotate, v.mask)
}
}
}
func TestMergePPC64SldiSrw(t *testing.T) {
tests := []struct {
sld int64
srw int64
valid bool
rotate int64
mask uint64
}{
{4, 4, true, 0, 0xFFFFFFF0},
{4, 8, true, 28, 0x0FFFFFF0},
{0, 0, true, 0, 0xFFFFFFFF},
{8, 4, false, 0, 0},
{0, 32, false, 0, 0},
{0, 31, true, 1, 0x1},
{31, 31, true, 0, 0x80000000},
{32, 32, false, 0, 0},
}
for i, v := range tests {
result := mergePPC64SldiSrw(v.sld, v.srw)
if v.valid && result == 0 {
t.Errorf("mergePPC64SldiSrw(Test %d) did not merge", i)
} else if !v.valid && result != 0 {
t.Errorf("mergePPC64SldiSrw(Test %d) should return 0", i)
} else if r, _, _, m := DecodePPC64RotateMask(result); v.rotate != r || v.mask != m {
t.Errorf("mergePPC64SldiSrw(Test %d) got (%d,0x%x) expected (%d,0x%x)", i, r, m, v.rotate, v.mask)
}
}
}
func TestMergePPC64AndSrwi(t *testing.T) {
tests := []struct {
and int64
srw int64
valid bool
rotate int64
mask uint64
}{
{0x000000FF, 8, true, 24, 0xFF},
{0xF00000FF, 8, true, 24, 0xFF},
{0x0F0000FF, 4, false, 0, 0},
{0x00000000, 4, false, 0, 0},
{0xF0000000, 4, false, 0, 0},
{0xF0000000, 32, false, 0, 0},
{0xFFFFFFFF, 0, true, 0, 0xFFFFFFFF},
}
for i, v := range tests {
result := mergePPC64AndSrwi(v.and, v.srw)
if v.valid && result == 0 {
t.Errorf("mergePPC64AndSrwi(Test %d) did not merge", i)
} else if !v.valid && result != 0 {
t.Errorf("mergePPC64AndSrwi(Test %d) should return 0", i)
} else if r, _, _, m := DecodePPC64RotateMask(result); v.rotate != r || v.mask != m {
t.Errorf("mergePPC64AndSrwi(Test %d) got (%d,0x%x) expected (%d,0x%x)", i, r, m, v.rotate, v.mask)
}
}
}
func TestDisjointTypes(t *testing.T) {
tests := []struct {
v1, v2 any // two pointers to some types
expected bool
}{
{new(int8), new(int8), false},
{new(int8), new(float32), false},
{new(int8), new(*int8), true},
{new(*int8), new(*float32), false},
{new(*int8), new(chan<- int8), false},
{new(**int8), new(*int8), false},
{new(***int8), new(**int8), false},
{new(int8), new(chan<- int8), true},
{new(int), unsafe.Pointer(nil), false},
{new(byte), new(string), false},
{new(int), new(string), false},
{new(*int8), new(struct{ a, b int }), true},
{new(*int8), new(struct {
a *int
b int
}), false},
{new(*int8), new(struct {
a int
b *int
}), false}, // with more precise analysis it should be true
{new(*byte), new(string), false},
{new(int), new(struct {
a int
b *int
}), false},
{new(float64), new(complex128), false},
{new(*byte), new([]byte), false},
{new(int), new([]byte), false},
{new(int), new([2]*byte), false}, // with more recise analysis it should be true
{new([2]int), new(*byte), true},
}
for _, tst := range tests {
t1 := rttype.FromReflect(reflect.TypeOf(tst.v1))
t2 := rttype.FromReflect(reflect.TypeOf(tst.v2))
result := disjointTypes(t1, t2)
if result != tst.expected {
t.Errorf("disjointTypes(%s, %s) got %t expected %t", t1.String(), t2.String(), result, tst.expected)
}
}
}
//go:noinline
func foo(p1 *int64, p2 *float64) int64 {
*p1 = 10
*p2 = 0 // disjointTypes shouldn't consider this and preceding stores as non-aliasing
return *p1
}
func TestDisjointTypesRun(t *testing.T) {
f := float64(0)
i := (*int64)(unsafe.Pointer(&f))
r := foo(i, &f)
if r != 0 {
t.Errorf("disjointTypes gives an incorrect answer that leads to an incorrect optimization.")
}
}