go/test/codegen/mathbits.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 "math/bits"

// ----------------------- //
//    bits.LeadingZeros    //
// ----------------------- //

func LeadingZeros(n uint) int {
	// amd64:"BSRQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.LeadingZeros(n)
}

func LeadingZeros64(n uint64) int {
	// amd64:"BSRQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.LeadingZeros64(n)
}

func LeadingZeros32(n uint32) int {
	// amd64:"BSRQ","LEAQ",-"CMOVQEQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.LeadingZeros32(n)
}

func LeadingZeros16(n uint16) int {
	// amd64:"BSRL","LEAL",-"CMOVQEQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.LeadingZeros16(n)
}

func LeadingZeros8(n uint8) int {
	// amd64:"BSRL","LEAL",-"CMOVQEQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.LeadingZeros8(n)
}

// --------------- //
//    bits.Len*    //
// --------------- //

func Len(n uint) int {
	// amd64:"BSRQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.Len(n)
}

func Len64(n uint64) int {
	// amd64:"BSRQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.Len64(n)
}

func Len32(n uint32) int {
	// amd64:"BSRQ","LEAQ",-"CMOVQEQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.Len32(n)
}

func Len16(n uint16) int {
	// amd64:"BSRL","LEAL",-"CMOVQEQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.Len16(n)
}

func Len8(n uint8) int {
	// amd64:"BSRL","LEAL",-"CMOVQEQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	return bits.Len8(n)
}

// -------------------- //
//    bits.OnesCount    //
// -------------------- //

func OnesCount(n uint) int {
	// amd64:"POPCNTQ",".*support_popcnt"
	// arm64:"VCNT","VUADDLV"
	return bits.OnesCount(n)
}

func OnesCount64(n uint64) int {
	// amd64:"POPCNTQ",".*support_popcnt"
	// arm64:"VCNT","VUADDLV"
	return bits.OnesCount64(n)
}

func OnesCount32(n uint32) int {
	// amd64:"POPCNTL",".*support_popcnt"
	// arm64:"VCNT","VUADDLV"
	return bits.OnesCount32(n)
}

func OnesCount16(n uint16) int {
	// amd64:"POPCNTL",".*support_popcnt"
	// arm64:"VCNT","VUADDLV"
	return bits.OnesCount16(n)
}

// ----------------------- //
//    bits.ReverseBytes    //
// ----------------------- //

func ReverseBytes(n uint) uint {
	// amd64:"BSWAPQ"
	// s390x:"MOVDBR"
	// arm64:"REV"
	return bits.ReverseBytes(n)
}

func ReverseBytes64(n uint64) uint64 {
	// amd64:"BSWAPQ"
	// s390x:"MOVDBR"
	// arm64:"REV"
	return bits.ReverseBytes64(n)
}

func ReverseBytes32(n uint32) uint32 {
	// amd64:"BSWAPL"
	// s390x:"MOVWBR"
	// arm64:"REVW"
	return bits.ReverseBytes32(n)
}

func ReverseBytes16(n uint16) uint16 {
	// amd64:"ROLW"
	return bits.ReverseBytes16(n)
}

// --------------------- //
//    bits.RotateLeft    //
// --------------------- //

func RotateLeft64(n uint64) uint64 {
	// amd64:"ROLQ"
	// arm64:"ROR"
	// ppc64:"ROTL"
	return bits.RotateLeft64(n, 37)
}

func RotateLeft32(n uint32) uint32 {
	// amd64:"ROLL" 386:"ROLL"
	// arm64:"RORW"
	// ppc64:"ROTLW"
	return bits.RotateLeft32(n, 9)
}

func RotateLeft16(n uint16) uint16 {
	// amd64:"ROLW" 386:"ROLW"
	return bits.RotateLeft16(n, 5)
}

func RotateLeft8(n uint8) uint8 {
	// amd64:"ROLB" 386:"ROLB"
	return bits.RotateLeft8(n, 5)
}

// ------------------------ //
//    bits.TrailingZeros    //
// ------------------------ //

func TrailingZeros(n uint) int {
	// amd64:"BSFQ","MOVL\t\\$64","CMOVQEQ"
	// s390x:"FLOGR"
	return bits.TrailingZeros(n)
}

func TrailingZeros64(n uint64) int {
	// amd64:"BSFQ","MOVL\t\\$64","CMOVQEQ"
	// s390x:"FLOGR"
	return bits.TrailingZeros64(n)
}

func TrailingZeros32(n uint32) int {
	// amd64:"BTSQ\\t\\$32","BSFQ"
	// s390x:"FLOGR","MOVWZ"
	return bits.TrailingZeros32(n)
}

func TrailingZeros16(n uint16) int {
	// amd64:"BSFL","BTSL\\t\\$16"
	// s390x:"FLOGR","OR\t\\$65536"
	return bits.TrailingZeros16(n)
}

func TrailingZeros8(n uint8) int {
	// amd64:"BSFL","BTSL\\t\\$8"
	// s390x:"FLOGR","OR\t\\$256"
	return bits.TrailingZeros8(n)
}

// IterateBitsNN checks special handling of TrailingZerosNN when the input is known to be non-zero.

func IterateBits(n uint) int {
	i := 0
	for n != 0 {
		// amd64:"BSFQ",-"CMOVEQ"
		i += bits.TrailingZeros(n)
		n &= n - 1
	}
	return i
}

func IterateBits64(n uint64) int {
	i := 0
	for n != 0 {
		// amd64:"BSFQ",-"CMOVEQ"
		i += bits.TrailingZeros64(n)
		n &= n - 1
	}
	return i
}

func IterateBits32(n uint32) int {
	i := 0
	for n != 0 {
		// amd64:"BSFL",-"BTSQ"
		i += bits.TrailingZeros32(n)
		n &= n - 1
	}
	return i
}

func IterateBits16(n uint16) int {
	i := 0
	for n != 0 {
		// amd64:"BSFL",-"BTSL"
		i += bits.TrailingZeros16(n)
		n &= n - 1
	}
	return i
}

func IterateBits8(n uint8) int {
	i := 0
	for n != 0 {
		// amd64:"BSFL",-"BTSL"
		i += bits.TrailingZeros8(n)
		n &= n - 1
	}
	return i
}