mirror of
https://github.com/golang/go
synced 2024-09-29 03:34:33 -06:00
42f99b203d
Under the right conditions we can optimize cmp comparisons to cmn
comparisons, such as:
func foo(a, b int) int {
var c int
if a + b < 0 {
c = 1
}
return c
}
Previously it's compiled as:
ADD R1, R0, R1
CMP $0, R1
CSET LT, R0
With this CL it's compiled as:
CMN R1, R0
CSET MI, R0
Here we need to pay attention to the overflow situation of a+b, the MI
flag means N==1, which doesn't honor the overflow flag V, its value
depends only on the sign of the result. So it has the same semantic of
the Go code, so it's correct.
Similarly, this CL also optimizes the case of >= comparison
using the PL conditional flag.
Change-Id: I47179faba5b30cca84ea69bafa2ad5241bf6dfba
Reviewed-on: https://go-review.googlesource.com/c/go/+/476116
Run-TryBot: Eric Fang <eric.fang@arm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
750 lines
14 KiB
Go
750 lines
14 KiB
Go
// asmcheck
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// Copyright 2018 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 codegen
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import "unsafe"
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// This file contains code generation tests related to the comparison
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// operators.
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// -------------- //
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// Equality //
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// -------------- //
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// Check that compare to constant string use 2/4/8 byte compares
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func CompareString1(s string) bool {
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// amd64:`CMPW\t\(.*\), [$]`
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// arm64:`MOVHU\t\(.*\), [R]`,`MOVD\t[$]`,`CMPW\tR`
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// ppc64le:`MOVHZ\t\(.*\), [R]`,`CMPW\t.*, [$]`
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// s390x:`MOVHBR\t\(.*\), [R]`,`CMPW\t.*, [$]`
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return s == "xx"
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}
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func CompareString2(s string) bool {
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// amd64:`CMPL\t\(.*\), [$]`
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// arm64:`MOVWU\t\(.*\), [R]`,`CMPW\t.*, [R]`
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// ppc64le:`MOVWZ\t\(.*\), [R]`,`CMPW\t.*, [R]`
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// s390x:`MOVWBR\t\(.*\), [R]`,`CMPW\t.*, [$]`
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return s == "xxxx"
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}
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func CompareString3(s string) bool {
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// amd64:`CMPQ\t\(.*\), [A-Z]`
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// arm64:-`CMPW\t`
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// ppc64x:-`CMPW\t`
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// s390x:-`CMPW\t`
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return s == "xxxxxxxx"
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}
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// Check that arrays compare use 2/4/8 byte compares
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func CompareArray1(a, b [2]byte) bool {
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// amd64:`CMPW\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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// arm64:-`MOVBU\t`
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// ppc64le:-`MOVBZ\t`
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// s390x:-`MOVBZ\t`
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return a == b
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}
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func CompareArray2(a, b [3]uint16) bool {
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// amd64:`CMPL\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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// amd64:`CMPW\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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return a == b
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}
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func CompareArray3(a, b [3]int16) bool {
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// amd64:`CMPL\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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// amd64:`CMPW\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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return a == b
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}
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func CompareArray4(a, b [12]int8) bool {
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// amd64:`CMPQ\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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// amd64:`CMPL\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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return a == b
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}
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func CompareArray5(a, b [15]byte) bool {
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// amd64:`CMPQ\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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return a == b
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}
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// This was a TODO in mapaccess1_faststr
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func CompareArray6(a, b unsafe.Pointer) bool {
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// amd64:`CMPL\t\(.*\), [A-Z]`
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// arm64:`MOVWU\t\(.*\), [R]`,`CMPW\t.*, [R]`
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// ppc64le:`MOVWZ\t\(.*\), [R]`,`CMPW\t.*, [R]`
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// s390x:`MOVWBR\t\(.*\), [R]`,`CMPW\t.*, [R]`
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return *((*[4]byte)(a)) != *((*[4]byte)(b))
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}
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// Check that some structs generate 2/4/8 byte compares.
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type T1 struct {
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a [8]byte
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}
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func CompareStruct1(s1, s2 T1) bool {
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// amd64:`CMPQ\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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// amd64:-`CALL`
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return s1 == s2
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}
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type T2 struct {
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a [16]byte
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}
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func CompareStruct2(s1, s2 T2) bool {
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// amd64:`CMPQ\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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// amd64:-`CALL`
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return s1 == s2
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}
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// Assert that a memequal call is still generated when
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// inlining would increase binary size too much.
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type T3 struct {
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a [24]byte
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}
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func CompareStruct3(s1, s2 T3) bool {
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// amd64:-`CMPQ\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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// amd64:`CALL`
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return s1 == s2
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}
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type T4 struct {
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a [32]byte
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}
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func CompareStruct4(s1, s2 T4) bool {
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// amd64:-`CMPQ\tcommand-line-arguments[.+_a-z0-9]+\(SP\), [A-Z]`
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// amd64:`CALL`
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return s1 == s2
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}
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// -------------- //
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// Ordering //
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// -------------- //
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// Test that LEAQ/ADDQconst are folded into SETx ops
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var r bool
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func CmpFold(x uint32) {
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// amd64:`SETHI\t.*\(SB\)`
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r = x > 4
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}
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// Test that direct comparisons with memory are generated when
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// possible
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func CmpMem1(p int, q *int) bool {
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// amd64:`CMPQ\t\(.*\), [A-Z]`
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return p < *q
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}
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func CmpMem2(p *int, q int) bool {
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// amd64:`CMPQ\t\(.*\), [A-Z]`
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return *p < q
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}
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func CmpMem3(p *int) bool {
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// amd64:`CMPQ\t\(.*\), [$]7`
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return *p < 7
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}
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func CmpMem4(p *int) bool {
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// amd64:`CMPQ\t\(.*\), [$]7`
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return 7 < *p
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}
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func CmpMem5(p **int) {
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// amd64:`CMPL\truntime.writeBarrier\(SB\), [$]0`
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*p = nil
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}
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func CmpMem6(a []int) int {
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// 386:`CMPL\s8\([A-Z]+\),`
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// amd64:`CMPQ\s16\([A-Z]+\),`
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if a[1] > a[2] {
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return 1
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} else {
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return 2
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}
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}
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// Check tbz/tbnz are generated when comparing against zero on arm64
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func CmpZero1(a int32, ptr *int) {
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if a < 0 { // arm64:"TBZ"
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*ptr = 0
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}
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}
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func CmpZero2(a int64, ptr *int) {
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if a < 0 { // arm64:"TBZ"
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*ptr = 0
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}
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}
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func CmpZero3(a int32, ptr *int) {
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if a >= 0 { // arm64:"TBNZ"
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*ptr = 0
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}
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}
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func CmpZero4(a int64, ptr *int) {
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if a >= 0 { // arm64:"TBNZ"
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*ptr = 0
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}
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}
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func CmpToZero(a, b, d int32, e, f int64, deOptC0, deOptC1 bool) int32 {
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// arm:`TST`,-`AND`
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// arm64:`TSTW`,-`AND`
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// 386:`TESTL`,-`ANDL`
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// amd64:`TESTL`,-`ANDL`
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c0 := a&b < 0
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// arm:`CMN`,-`ADD`
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// arm64:`CMNW`,-`ADD`
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c1 := a+b < 0
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// arm:`TEQ`,-`XOR`
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c2 := a^b < 0
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// arm64:`TST`,-`AND`
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// amd64:`TESTQ`,-`ANDQ`
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c3 := e&f < 0
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// arm64:`CMN`,-`ADD`
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c4 := e+f < 0
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// not optimized to single CMNW/CMN due to further use of b+d
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// arm64:`ADD`,-`CMNW`
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// arm:`ADD`,-`CMN`
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c5 := b+d == 0
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// not optimized to single TSTW/TST due to further use of a&d
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// arm64:`AND`,-`TSTW`
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// arm:`AND`,-`TST`
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// 386:`ANDL`
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c6 := a&d >= 0
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// arm64:`TST\sR[0-9]+<<3,\sR[0-9]+`
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c7 := e&(f<<3) < 0
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// arm64:`CMN\sR[0-9]+<<3,\sR[0-9]+`
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c8 := e+(f<<3) < 0
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// arm64:`TST\sR[0-9],\sR[0-9]+`
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c9 := e&17 < 0
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if c0 {
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return 1
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} else if c1 {
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return 2
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} else if c2 {
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return 3
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} else if c3 {
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return 4
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} else if c4 {
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return 5
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} else if c5 {
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return 6
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} else if c6 {
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return 7
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} else if c7 {
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return 9
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} else if c8 {
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return 10
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} else if c9 {
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return 11
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} else if deOptC0 {
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return b + d
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} else if deOptC1 {
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return a & d
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} else {
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return 0
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}
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}
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func CmpLogicalToZero(a, b, c uint32, d, e uint64) uint64 {
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// ppc64x:"ANDCC",-"CMPW"
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// wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
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if a&63 == 0 {
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return 1
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}
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// ppc64x:"ANDCC",-"CMP"
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// wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
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if d&255 == 0 {
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return 1
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}
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// ppc64x:"ANDCC",-"CMP"
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// wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
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if d&e == 0 {
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return 1
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}
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// ppc64x:"ORCC",-"CMP"
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// wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
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if d|e == 0 {
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return 1
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}
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// ppc64x:"XORCC",-"CMP"
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// wasm:"I64Eqz","I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
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if e^d == 0 {
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return 1
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}
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return 0
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}
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// The following CmpToZero_ex* check that cmp|cmn with bmi|bpl are generated for
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// 'comparing to zero' expressions
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// var + const
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// 'x-const' might be canonicalized to 'x+(-const)', so we check both
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// CMN and CMP for subtraction expressions to make the pattern robust.
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func CmpToZero_ex1(a int64, e int32) int {
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// arm64:`CMN`,-`ADD`,`(BMI|BPL)`
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if a+3 < 0 {
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return 1
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}
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// arm64:`CMN`,-`ADD`,`BEQ`,`(BMI|BPL)`
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if a+5 <= 0 {
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return 1
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}
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// arm64:`CMN`,-`ADD`,`(BMI|BPL)`
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if a+13 >= 0 {
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return 2
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}
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// arm64:`CMP|CMN`,-`(ADD|SUB)`,`(BMI|BPL)`
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if a-7 < 0 {
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return 3
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}
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// arm64:`SUB`,`TBZ`
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if a-11 >= 0 {
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return 4
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}
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// arm64:`SUB`,`CMP`,`BGT`
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if a-19 > 0 {
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return 4
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}
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// arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
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// arm:`CMN`,-`ADD`,`(BMI|BPL)`
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if e+3 < 0 {
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return 5
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}
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// arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
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// arm:`CMN`,-`ADD`,`(BMI|BPL)`
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if e+13 >= 0 {
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return 6
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}
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// arm64:`CMPW|CMNW`,`(BMI|BPL)`
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// arm:`CMP|CMN`, -`(ADD|SUB)`, `(BMI|BPL)`
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if e-7 < 0 {
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return 7
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}
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// arm64:`SUB`,`TBNZ`
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// arm:`CMP|CMN`, -`(ADD|SUB)`, `(BMI|BPL)`
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if e-11 >= 0 {
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return 8
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}
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return 0
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}
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// var + var
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// TODO: optimize 'var - var'
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func CmpToZero_ex2(a, b, c int64, e, f, g int32) int {
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// arm64:`CMN`,-`ADD`,`(BMI|BPL)`
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if a+b < 0 {
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return 1
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}
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// arm64:`CMN`,-`ADD`,`BEQ`,`(BMI|BPL)`
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if a+c <= 0 {
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return 1
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}
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// arm64:`CMN`,-`ADD`,`(BMI|BPL)`
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if b+c >= 0 {
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return 2
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}
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// arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
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// arm:`CMN`,-`ADD`,`(BMI|BPL)`
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if e+f < 0 {
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return 5
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}
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// arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
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// arm:`CMN`,-`ADD`,`(BMI|BPL)`
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if f+g >= 0 {
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return 6
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}
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return 0
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}
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// var + var*var
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func CmpToZero_ex3(a, b, c, d int64, e, f, g, h int32) int {
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// arm64:`CMN`,-`MADD`,`MUL`,`(BMI|BPL)`
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if a+b*c < 0 {
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return 1
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}
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// arm64:`CMN`,-`MADD`,`MUL`,`(BMI|BPL)`
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if b+c*d >= 0 {
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return 2
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}
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// arm64:`CMNW`,-`MADDW`,`MULW`,`BEQ`,`(BMI|BPL)`
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// arm:`CMN`,-`MULA`,`MUL`,`BEQ`,`(BMI|BPL)`
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if e+f*g > 0 {
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return 5
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}
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// arm64:`CMNW`,-`MADDW`,`MULW`,`BEQ`,`(BMI|BPL)`
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// arm:`CMN`,-`MULA`,`MUL`,`BEQ`,`(BMI|BPL)`
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if f+g*h <= 0 {
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return 6
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}
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return 0
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}
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// var - var*var
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func CmpToZero_ex4(a, b, c, d int64, e, f, g, h int32) int {
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// arm64:`CMP`,-`MSUB`,`MUL`,`BEQ`,`(BMI|BPL)`
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if a-b*c > 0 {
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return 1
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}
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// arm64:`CMP`,-`MSUB`,`MUL`,`(BMI|BPL)`
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if b-c*d >= 0 {
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return 2
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}
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// arm64:`CMPW`,-`MSUBW`,`MULW`,`(BMI|BPL)`
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if e-f*g < 0 {
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return 5
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}
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// arm64:`CMPW`,-`MSUBW`,`MULW`,`(BMI|BPL)`
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if f-g*h >= 0 {
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return 6
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}
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return 0
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}
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func CmpToZero_ex5(e, f int32, u uint32) int {
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// arm:`CMN`,-`ADD`,`BEQ`,`(BMI|BPL)`
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if e+f<<1 > 0 {
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return 1
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}
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// arm:`CMP`,-`SUB`,`(BMI|BPL)`
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if f-int32(u>>2) >= 0 {
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return 2
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}
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return 0
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}
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func UintLtZero(a uint8, b uint16, c uint32, d uint64) int {
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// amd64: -`(TESTB|TESTW|TESTL|TESTQ|JCC|JCS)`
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// arm64: -`(CMPW|CMP|BHS|BLO)`
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if a < 0 || b < 0 || c < 0 || d < 0 {
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return 1
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}
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return 0
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}
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func UintGeqZero(a uint8, b uint16, c uint32, d uint64) int {
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// amd64: -`(TESTB|TESTW|TESTL|TESTQ|JCS|JCC)`
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// arm64: -`(CMPW|CMP|BLO|BHS)`
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if a >= 0 || b >= 0 || c >= 0 || d >= 0 {
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return 1
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}
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return 0
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}
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func UintGtZero(a uint8, b uint16, c uint32, d uint64) int {
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// arm64: `(CBN?ZW)`, `(CBN?Z[^W])`, -`(CMPW|CMP|BLS|BHI)`
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if a > 0 || b > 0 || c > 0 || d > 0 {
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return 1
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}
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return 0
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|
}
|
|
|
|
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"
|
|
// ppc64x:-".*memequal"
|
|
return a == b
|
|
}
|
|
|
|
func equalVarString1(a string) bool {
|
|
b := string("Z")
|
|
// amd64:-".*memequal"
|
|
// arm64:-".*memequal"
|
|
// ppc64x:-".*memequal"
|
|
return a[:1] == b
|
|
}
|
|
|
|
func equalConstString2() bool {
|
|
a := string("AA")
|
|
b := string("ZZ")
|
|
// amd64:-".*memequal"
|
|
// arm64:-".*memequal"
|
|
// ppc64x:-".*memequal"
|
|
return a == b
|
|
}
|
|
|
|
func equalVarString2(a string) bool {
|
|
b := string("ZZ")
|
|
// amd64:-".*memequal"
|
|
// arm64:-".*memequal"
|
|
// ppc64x:-".*memequal"
|
|
return a[:2] == b
|
|
}
|
|
|
|
func equalConstString4() bool {
|
|
a := string("AAAA")
|
|
b := string("ZZZZ")
|
|
// amd64:-".*memequal"
|
|
// arm64:-".*memequal"
|
|
// ppc64x:-".*memequal"
|
|
return a == b
|
|
}
|
|
|
|
func equalVarString4(a string) bool {
|
|
b := string("ZZZZ")
|
|
// amd64:-".*memequal"
|
|
// arm64:-".*memequal"
|
|
// ppc64x:-".*memequal"
|
|
return a[:4] == b
|
|
}
|
|
|
|
func equalConstString8() bool {
|
|
a := string("AAAAAAAA")
|
|
b := string("ZZZZZZZZ")
|
|
// amd64:-".*memequal"
|
|
// arm64:-".*memequal"
|
|
// ppc64x:-".*memequal"
|
|
return a == b
|
|
}
|
|
|
|
func equalVarString8(a string) bool {
|
|
b := string("ZZZZZZZZ")
|
|
// amd64:-".*memequal"
|
|
// arm64:-".*memequal"
|
|
// ppc64x:-".*memequal"
|
|
return a[:8] == b
|
|
}
|
|
|
|
func cmpToCmn(a, b, c, d int) int {
|
|
var c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11 int
|
|
// arm64:`CMN`,-`CMP`
|
|
if a < -8 {
|
|
c1 = 1
|
|
}
|
|
// arm64:`CMN`,-`CMP`
|
|
if a+1 == 0 {
|
|
c2 = 1
|
|
}
|
|
// arm64:`CMN`,-`CMP`
|
|
if a+3 != 0 {
|
|
c3 = 1
|
|
}
|
|
// arm64:`CMN`,-`CMP`
|
|
if a+b == 0 {
|
|
c4 = 1
|
|
}
|
|
// arm64:`CMN`,-`CMP`
|
|
if b+c != 0 {
|
|
c5 = 1
|
|
}
|
|
// arm64:`CMN`,-`CMP`
|
|
if a == -c {
|
|
c6 = 1
|
|
}
|
|
// arm64:`CMN`,-`CMP`
|
|
if b != -d {
|
|
c7 = 1
|
|
}
|
|
// arm64:`CMN`,-`CMP`
|
|
if a*b+c == 0 {
|
|
c8 = 1
|
|
}
|
|
// arm64:`CMN`,-`CMP`
|
|
if a*c+b != 0 {
|
|
c9 = 1
|
|
}
|
|
// arm64:`CMP`,-`CMN`
|
|
if b*c-a == 0 {
|
|
c10 = 1
|
|
}
|
|
// arm64:`CMP`,-`CMN`
|
|
if a*d-b != 0 {
|
|
c11 = 1
|
|
}
|
|
return c1 + c2 + c3 + c4 + c5 + c6 + c7 + c8 + c9 + c10 + c11
|
|
}
|
|
|
|
func cmpToCmnLessThan(a, b, c, d int) int {
|
|
var c1, c2, c3, c4 int
|
|
// arm64:`CMN`,`CSET\tMI`,-`CMP`
|
|
if a+1 < 0 {
|
|
c1 = 1
|
|
}
|
|
// arm64:`CMN`,`CSET\tMI`,-`CMP`
|
|
if a+b < 0 {
|
|
c2 = 1
|
|
}
|
|
// arm64:`CMN`,`CSET\tMI`,-`CMP`
|
|
if a*b+c < 0 {
|
|
c3 = 1
|
|
}
|
|
// arm64:`CMP`,`CSET\tMI`,-`CMN`
|
|
if a-b*c < 0 {
|
|
c4 = 1
|
|
}
|
|
return c1 + c2 + c3 + c4
|
|
}
|
|
|
|
func cmpToCmnGreaterThanEqual(a, b, c, d int) int {
|
|
var c1, c2, c3, c4 int
|
|
// arm64:`CMN`,`CSET\tPL`,-`CMP`
|
|
if a+1 >= 0 {
|
|
c1 = 1
|
|
}
|
|
// arm64:`CMN`,`CSET\tPL`,-`CMP`
|
|
if a+b >= 0 {
|
|
c2 = 1
|
|
}
|
|
// arm64:`CMN`,`CSET\tPL`,-`CMP`
|
|
if a*b+c >= 0 {
|
|
c3 = 1
|
|
}
|
|
// arm64:`CMP`,`CSET\tPL`,-`CMN`
|
|
if a-b*c >= 0 {
|
|
c4 = 1
|
|
}
|
|
return c1 + c2 + c3 + c4
|
|
}
|