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Change-Id: Ia64535492515f725fe3c4b59ea300363a0c4ce10 Reviewed-on: https://go-review.googlesource.com/107136 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
183 lines
2.7 KiB
Go
183 lines
2.7 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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func cmovint(c int) int {
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x := c + 4
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if x < 0 {
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x = 182
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}
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// amd64:"CMOVQLT"
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// arm64:"CSEL\tLT"
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return x
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}
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func cmovchan(x, y chan int) chan int {
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if x != y {
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x = y
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}
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// amd64:"CMOVQNE"
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// arm64:"CSEL\tNE"
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return x
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}
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func cmovuintptr(x, y uintptr) uintptr {
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if x < y {
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x = -y
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}
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// amd64:"CMOVQCS"
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// arm64:"CSEL\tLO"
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return x
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}
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func cmov32bit(x, y uint32) uint32 {
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if x < y {
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x = -y
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}
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// amd64:"CMOVLCS"
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// arm64:"CSEL\tLO"
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return x
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}
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func cmov16bit(x, y uint16) uint16 {
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if x < y {
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x = -y
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}
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// amd64:"CMOVWCS"
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// arm64:"CSEL\tLO"
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return x
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}
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// Floating point comparison. For EQ/NE, we must
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// generate special code to handle NaNs.
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func cmovfloateq(x, y float64) int {
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a := 128
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if x == y {
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a = 256
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}
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// amd64:"CMOVQNE","CMOVQPC"
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// arm64:"CSEL\tEQ"
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return a
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}
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func cmovfloatne(x, y float64) int {
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a := 128
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if x != y {
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a = 256
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}
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// amd64:"CMOVQNE","CMOVQPS"
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// arm64:"CSEL\tNE"
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return a
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}
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//go:noinline
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func frexp(f float64) (frac float64, exp int) {
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return 1.0, 4
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}
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//go:noinline
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func ldexp(frac float64, exp int) float64 {
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return 1.0
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}
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// Generate a CMOV with a floating comparison and integer move.
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func cmovfloatint2(x, y float64) float64 {
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yfr, yexp := 4.0, 5
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r := x
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for r >= y {
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rfr, rexp := frexp(r)
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if rfr < yfr {
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rexp = rexp - 1
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}
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// amd64:"CMOVQHI"
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// arm64:"CSEL\tGT"
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r = r - ldexp(y, (rexp-yexp))
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}
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return r
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}
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func cmovloaded(x [4]int, y int) int {
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if x[2] != 0 {
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y = x[2]
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} else {
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y = y >> 2
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}
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// amd64:"CMOVQNE"
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// arm64:"CSEL\tNE"
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return y
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}
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func cmovuintptr2(x, y uintptr) uintptr {
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a := x * 2
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if a == 0 {
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a = 256
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}
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// amd64:"CMOVQEQ"
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// arm64:"CSEL\tEQ"
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return a
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}
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// Floating point CMOVs are not supported by amd64/arm64
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func cmovfloatmove(x, y int) float64 {
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a := 1.0
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if x <= y {
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a = 2.0
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}
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// amd64:-"CMOV"
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// arm64:-"CSEL"
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return a
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}
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// On amd64, the following patterns trigger comparison inversion.
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// Test that we correctly invert the CMOV condition
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var gsink int64
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var gusink uint64
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func cmovinvert1(x, y int64) int64 {
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if x < gsink {
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y = -y
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}
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// amd64:"CMOVQGT"
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return y
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}
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func cmovinvert2(x, y int64) int64 {
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if x <= gsink {
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y = -y
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}
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// amd64:"CMOVQGE"
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return y
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}
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func cmovinvert3(x, y int64) int64 {
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if x == gsink {
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y = -y
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}
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// amd64:"CMOVQEQ"
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return y
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}
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func cmovinvert4(x, y int64) int64 {
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if x != gsink {
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y = -y
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}
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// amd64:"CMOVQNE"
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return y
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}
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func cmovinvert5(x, y uint64) uint64 {
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if x > gusink {
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y = -y
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}
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// amd64:"CMOVQCS"
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return y
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}
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func cmovinvert6(x, y uint64) uint64 {
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if x >= gusink {
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y = -y
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}
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// amd64:"CMOVQLS"
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return y
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}
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