golang comparisons 代码
文件路径：/test/codegen/comparisons.go
/ asmcheck
/ Copyright 2018 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 codegen
import "unsafe"
/ This file contains code generation tests related to the comparison
/ operators.
/ -------------- /
/ Equality /
/ -------------- /
/ Check that compare to constant string use 2/4/8 byte compares
func CompareString1(s string) bool {
/ amd64:`CMPW\t\(.*\), [$]`
/ arm64:`MOVHU\t\(.*\), [R]`,`CMPW\t[$]`
/ ppc64le:`MOVHZ\t\(.*\), [R]`,`CMPW\t.*, [$]`
/ s390x:`MOVHBR\t\(.*\), [R]`,`CMPW\t.*, [$]`
return s == "xx"
}
func CompareString2(s string) bool {
/ amd64:`CMPL\t\(.*\), [$]`
/ arm64:`MOVWU\t\(.*\), [R]`,`CMPW\t.*, [R]`
/ ppc64le:`MOVWZ\t\(.*\), [R]`,`CMPW\t.*, [R]`
/ s390x:`MOVWBR\t\(.*\), [R]`,`CMPW\t.*, [$]`
return s == "xxxx"
}
func CompareString3(s string) bool {
/ amd64:`CMPQ\t\(.*\), [A-Z]`
/ arm64:-`CMPW\t`
/ ppc64:-`CMPW\t`
/ ppc64le:-`CMPW\t`
/ s390x:-`CMPW\t`
return s == "xxxxxxxx"
}
/ Check that arrays compare use 2/4/8 byte compares
func CompareArray1(a, b [2]byte) bool {
/ amd64:`CMPW\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
/ arm64:-`MOVBU\t`
/ ppc64le:-`MOVBZ\t`
/ s390x:-`MOVBZ\t`
return a == b
}
func CompareArray2(a, b [3]uint16) bool {
/ amd64:`CMPL\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
/ amd64:`CMPW\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
return a == b
}
func CompareArray3(a, b [3]int16) bool {
/ amd64:`CMPL\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
/ amd64:`CMPW\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
return a == b
}
func CompareArray4(a, b [12]int8) bool {
/ amd64:`CMPQ\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
/ amd64:`CMPL\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
return a == b
}
func CompareArray5(a, b [15]byte) bool {
/ amd64:`CMPQ\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
return a == b
}
/ This was a TODO in mapaccess1_faststr
func CompareArray6(a, b unsafe.Pointer) bool {
/ amd64:`CMPL\t\(.*\), [A-Z]`
/ arm64:`MOVWU\t\(.*\), [R]`,`CMPW\t.*, [R]`
/ ppc64le:`MOVWZ\t\(.*\), [R]`,`CMPW\t.*, [R]`
/ s390x:`MOVWBR\t\(.*\), [R]`,`CMPW\t.*, [R]`
return *((*[4]byte)(a)) != *((*[4]byte)(b))
}
/ -------------- /
/ Ordering /
/ -------------- /
/ Test that LEAQ/ADDQconst are folded into SETx ops
var r bool
func CmpFold(x uint32) {
/ amd64:`SETHI\t.*\(SB\)`
r = x > 4
}
/ Test that direct comparisons with memory are generated when
/ possible
func CmpMem1(p int, q *int) bool {
/ amd64:`CMPQ\t\(.*\), [A-Z]`
return p < *q
}
func CmpMem2(p *int, q int) bool {
/ amd64:`CMPQ\t\(.*\), [A-Z]`
return *p < q
}
func CmpMem3(p *int) bool {
/ amd64:`CMPQ\t\(.*\), [$]7`
return *p < 7
}
func CmpMem4(p *int) bool {
/ amd64:`CMPQ\t\(.*\), [$]7`
return 7 < *p
}
func CmpMem5(p **int) {
/ amd64:`CMPL\truntime.writeBarrier\(SB\), [$]0`
*p = nil
}
func CmpMem6(a []int) int {
/ 386:`CMPL\s8\([A-Z]+\),`
/ amd64:`CMPQ\s16\([A-Z]+\),`
if a[1] > a[2] {
return 1
} else {
return 2
}
}
/ Check tbz/tbnz are generated when comparing against zero on arm64
func CmpZero1(a int32, ptr *int) {
if a < 0 { / arm64:"TBZ"
*ptr = 0
}
}
func CmpZero2(a int64, ptr *int) {
if a < 0 { / arm64:"TBZ"
*ptr = 0
}
}
func CmpZero3(a int32, ptr *int) {
if a >= 0 { / arm64:"TBNZ"
*ptr = 0
}
}
func CmpZero4(a int64, ptr *int) {
if a >= 0 { / arm64:"TBNZ"
*ptr = 0
}
}
func CmpToZero(a, b, d int32, e, f int64, deOptC0, deOptC1 bool) int32 {
/ arm:`TST`,-`AND`
/ arm64:`TSTW`,-`AND`
/ 386:`TESTL`,-`ANDL`
/ amd64:`TESTL`,-`ANDL`
c0 := a&b < 0
/ arm:`CMN`,-`ADD`
/ arm64:`CMNW`,-`ADD`
c1 := a+b < 0
/ arm:`TEQ`,-`XOR`
c2 := a^b < 0
/ arm64:`TST`,-`AND`
/ amd64:`TESTQ`,-`ANDQ`
c3 := e&f < 0
/ arm64:`CMN`,-`ADD`
c4 := e+f < 0
/ not optimized to single CMNW/CMN due to further use of b+d
/ arm64:`ADD`,-`CMNW`
/ arm:`ADD`,-`CMN`
c5 := b+d == 0
/ not optimized to single TSTW/TST due to further use of a&d
/ arm64:`AND`,-`TSTW`
/ arm:`AND`,-`TST`
/ 386:`ANDL`
c6 := a&d >= 0
/ arm64:`TST\sR[0-9]+<<3,\sR[0-9]+`
c7 := e&(f<<3) < 0
/ arm64:`CMN\sR[0-9]+<<3,\sR[0-9]+`
c8 := e+(f<<3) < 0
if c0 {
return 1
} else if c1 {
return 2
} else if c2 {
return 3
} else if c3 {
return 4
} else if c4 {
return 5
} else if c5 {
return 6
} else if c6 {
return 7
} else if c7 {
return 9
} else if c8 {
return 10
} else if deOptC0 {
return b + d
} else if deOptC1 {
return a & d
} else {
return 0
}
}
func CmpLogicalToZero(a, b, c uint32, d, e uint64) uint64 {
/ ppc64:"ANDCC",-"CMPW"
/ ppc64le:"ANDCC",-"CMPW"
/ wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
if a&63 == 0 {
return 1
}
/ ppc64:"ANDCC",-"CMP"
/ ppc64le:"ANDCC",-"CMP"
/ wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
if d&255 == 0 {
return 1
}
/ ppc64:"ANDCC",-"CMP"
/ ppc64le:"ANDCC",-"CMP"
/ wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
if d&e == 0 {
return 1
}
/ ppc64:"ORCC",-"CMP"
/ ppc64le:"ORCC",-"CMP"
/ wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
if d|e == 0 {
return 1
}
/ ppc64:"XORCC",-"CMP"
/ ppc64le:"XORCC",-"CMP"
/ wasm:"I64Eqz","I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
if e^d == 0 {
return 1
}
return 0
}
/ The following CmpToZero_ex* check that cmp|cmn with bmi|bpl are generated for
/ 'comparing to zero' expressions
/ var + const
/ 'x-const' might be canonicalized to 'x+(-const)', so we check both
/ CMN and CMP for subtraction expressions to make the pattern robust.
func CmpToZero_ex1(a int64, e int32) int {
/ arm64:`CMN`,-`ADD`,`(BMI|BPL)`
if a+3 < 0 {
return 1
}
/ arm64:`CMN`,-`ADD`,`BEQ`,`(BMI|BPL)`
if a+5 <= 0 {
return 1
}
/ arm64:`CMN`,-`ADD`,`(BMI|BPL)`
if a+13 >= 0 {
return 2
}
/ arm64:`CMP|CMN`,-`(ADD|SUB)`,`(BMI|BPL)`
if a-7 < 0 {
return 3
}
/ arm64:`CMP|CMN`,-`(ADD|SUB)`,`(BMI|BPL)`
if a-11 >= 0 {
return 4
}
/ arm64:`CMP|CMN`,-`(ADD|SUB)`,`BEQ`,`(BMI|BPL)`
if a-19 > 0 {
return 4
}
/ arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
/ arm:`CMN`,-`ADD`,`(BMI|BPL)`
if e+3 < 0 {
return 5
}
/ arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
/ arm:`CMN`,-`ADD`,`(BMI|BPL)`
if e+13 >= 0 {
return 6
}
/ arm64:`CMPW|CMNW`,`(BMI|BPL)`
/ arm:`CMP|CMN`, -`(ADD|SUB)`, `(BMI|BPL)`
if e-7 < 0 {
return 7
}
/ arm64:`CMPW|CMNW`,`(BMI|BPL)`
/ arm:`CMP|CMN`, -`(ADD|SUB)`, `(BMI|BPL)`
if e-11 >= 0 {
return 8
}
return 0
}
/ var + var
/ TODO: optimize 'var - var'
func CmpToZero_ex2(a, b, c int64, e, f, g int32) int {
/ arm64:`CMN`,-`ADD`,`(BMI|BPL)`
if a+b < 0 {
return 1
}
/ arm64:`CMN`,-`ADD`,`BEQ`,`(BMI|BPL)`
if a+c <= 0 {
return 1
}
/ arm64:`CMN`,-`ADD`,`(BMI|BPL)`
if b+c >= 0 {
return 2
}
/ arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
/ arm:`CMN`,-`ADD`,`(BMI|BPL)`
if e+f < 0 {
return 5
}
/ arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
/ arm:`CMN`,-`ADD`,`(BMI|BPL)`
if f+g >= 0 {
return 6
}
return 0
}
/ var + var*var
func CmpToZero_ex3(a, b, c, d int64, e, f, g, h int32) int {
/ arm64:`CMN`,-`MADD`,`MUL`,`(BMI|BPL)`
if a+b*c < 0 {
return 1
}
/ arm64:`CMN`,-`MADD`,`MUL`,`(BMI|BPL)`
if b+c*d >= 0 {
return 2
}
/ arm64:`CMNW`,-`MADDW`,`MULW`,`BEQ`,`(BMI|BPL)`
/ arm:`CMN`,-`MULA`,`MUL`,`BEQ`,`(BMI|BPL)`
if e+f*g > 0 {
return 5
}
/ arm64:`CMNW`,-`MADDW`,`MULW`,`BEQ`,`(BMI|BPL)`
/ arm:`CMN`,-`MULA`,`MUL`,`BEQ`,`(BMI|BPL)`
if f+g*h <= 0 {
return 6
}
return 0
}
/ var - var*var
func CmpToZero_ex4(a, b, c, d int64, e, f, g, h int32) int {
/ arm64:`CMP`,-`MSUB`,`MUL`,`BEQ`,`(BMI|BPL)`
if a-b*c > 0 {
return 1
}
/ arm64:`CMP`,-`MSUB`,`MUL`,`(BMI|BPL)`
if b-c*d >= 0 {
return 2
}
/ arm64:`CMPW`,-`MSUBW`,`MULW`,`(BMI|BPL)`
if e-f*g < 0 {
return 5
}
/ arm64:`CMPW`,-`MSUBW`,`MULW`,`(BMI|BPL)`
if f-g*h >= 0 {
return 6
}
return 0
}
func CmpToZero_ex5(e, f int32, u uint32) int {
/ arm:`CMN`,-`ADD`,`BEQ`,`(BMI|BPL)`
if e+f<<1 > 0 {
return 1
}
/ arm:`CMP`,-`SUB`,`(BMI|BPL)`
if f-int32(u>>2) >= 0 {
return 2
}
return 0
}
func UintLtZero(a uint8, b uint16, c uint32, d uint64) int {
/ amd64: -`(TESTB|TESTW|TESTL|TESTQ|JCC|JCS)`
/ arm64: -`(CMPW|CMP|BHS|BLO)`
if a < 0 || b < 0 || c < 0 || d < 0 {
return 1
}
return 0
}
func UintGeqZero(a uint8, b uint16, c uint32, d uint64) int {
/ amd64: -`(TESTB|TESTW|TESTL|TESTQ|JCS|JCC)`
/ arm64: -`(CMPW|CMP|BLO|BHS)`
if a >= 0 || b >= 0 || c >= 0 || d >= 0 {
return 1
}
return 0
}
func UintGtZero(a uint8, b uint16, c uint32, d uint64) int {
/ arm64: `(CBN?ZW)`, `(CBN?Z[^W])`, -`(CMPW|CMP|BLS|BHI)`
if a > 0 || b > 0 || c > 0 || d > 0 {
return 1
}
return 0
}
func UintLeqZero(a uint8, b uint16, c uint32, d uint64) int {
/ arm64: `(CBN?ZW)`, `(CBN?Z[^W])`, -`(CMPW|CMP|BHI|BLS)`
if a <= 0 || b <= 0 || c <= 0 || d <= 0 {
return 1
}
return 0
}
func UintLtOne(a uint8, b uint16, c uint32, d uint64) int {
/ arm64: `(CBN?ZW)`, `(CBN?Z[^W])`, -`(CMPW|CMP|BHS|BLO)`
if a < 1 || b < 1 || c < 1 || d < 1 {
return 1
}
return 0
}
func UintGeqOne(a uint8, b uint16, c uint32, d uint64) int {
/ arm64: `(CBN?ZW)`, `(CBN?Z[^W])`, -`(CMPW|CMP|BLO|BHS)`
if a >= 1 || b >= 1 || c >= 1 || d >= 1 {
return 1
}
return 0
}
func CmpToZeroU_ex1(a uint8, b uint16, c uint32, d uint64) int {
/ wasm:"I64Eqz"-"I64LtU"
if 0 < a {
return 1
}
/ wasm:"I64Eqz"-"I64LtU"
if 0 < b {
return 1
}
/ wasm:"I64Eqz"-"I64LtU"
if 0 < c {
return 1
}
/ wasm:"I64Eqz"-"I64LtU"
if 0 < d {
return 1
}
return 0
}
func CmpToZeroU_ex2(a uint8, b uint16, c uint32, d uint64) int {
/ wasm:"I64Eqz"-"I64LeU"
if a <= 0 {
return 1
}
/ wasm:"I64Eqz"-"I64LeU"
if b <= 0 {
return 1
}
/ wasm:"I64Eqz"-"I64LeU"
if c <= 0 {
return 1
}
/ wasm:"I64Eqz"-"I64LeU"
if d <= 0 {
return 1
}
return 0
}
func CmpToOneU_ex1(a uint8, b uint16, c uint32, d uint64) int {
/ wasm:"I64Eqz"-"I64LtU"
if a < 1 {
return 1
}
/ wasm:"I64Eqz"-"I64LtU"
if b < 1 {
return 1
}
/ wasm:"I64Eqz"-"I64LtU"
if c < 1 {
return 1
}
/ wasm:"I64Eqz"-"I64LtU"
if d < 1 {
return 1
}
return 0
}
func CmpToOneU_ex2(a uint8, b uint16, c uint32, d uint64) int {
/ wasm:"I64Eqz"-"I64LeU"
if 1 <= a {
return 1
}
/ wasm:"I64Eqz"-"I64LeU"
if 1 <= b {
return 1
}
/ wasm:"I64Eqz"-"I64LeU"
if 1 <= c {
return 1
}
/ wasm:"I64Eqz"-"I64LeU"
if 1 <= d {
return 1
}
return 0
}
/ Check that small memequals are replaced with eq instructions
func equalConstString1() bool {
a := string("A")
b := string("Z")
/ amd64:-".*memequal"
/ arm64:-".*memequal"
/ ppc64:-".*memequal"
/ ppc64le:-".*memequal"
return a == b
}
func equalVarString1(a string) bool {
b := string("Z")
/ amd64:-".*memequal"
/ arm64:-".*memequal"
/ ppc64:-".*memequal"
/ ppc64le:-".*memequal"
return a[:1] == b
}
func equalConstString2() bool {
a := string("AA")
b := string("ZZ")
/ amd64:-".*memequal"
/ arm64:-".*memequal"
/ ppc64:-".*memequal"
/ ppc64le:-".*memequal"
return a == b
}
func equalVarString2(a string) bool {
b := string("ZZ")
/ amd64:-".*memequal"
/ arm64:-".*memequal"
/ ppc64:-".*memequal"
/ ppc64le:-".*memequal"
return a[:2] == b
}
func equalConstString4() bool {
a := string("AAAA")
b := string("ZZZZ")
/ amd64:-".*memequal"
/ arm64:-".*memequal"
/ ppc64:-".*memequal"
/ ppc64le:-".*memequal"
return a == b
}
func equalVarString4(a string) bool {
b := string("ZZZZ")
/ amd64:-".*memequal"
/ arm64:-".*memequal"
/ ppc64:-".*memequal"
/ ppc64le:-".*memequal"
return a[:4] == b
}
func equalConstString8() bool {
a := string("AAAAAAAA")
b := string("ZZZZZZZZ")
/ amd64:-".*memequal"
/ arm64:-".*memequal"
/ ppc64:-".*memequal"
/ ppc64le:-".*memequal"
return a == b
}
func equalVarString8(a string) bool {
b := string("ZZZZZZZZ")
/ amd64:-".*memequal"
/ arm64:-".*memequal"
/ ppc64:-".*memequal"
/ ppc64le:-".*memequal"
return a[:8] == b
}