/
rotate.go
160 lines (115 loc) · 2.33 KB
/
rotate.go
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// 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
// ------------------- //
// const rotates //
// ------------------- //
func rot64(x uint64) uint64 {
var a uint64
// amd64:"ROLQ\t[$]7"
// arm64:"ROR\t[$]57"
// s390x:"RLLG\t[$]7"
// ppc64le:"ROTL\t[$]7"
a += x<<7 | x>>57
// amd64:"ROLQ\t[$]8"
// arm64:"ROR\t[$]56"
// s390x:"RLLG\t[$]8"
// ppc64le:"ROTL\t[$]8"
a += x<<8 + x>>56
// amd64:"ROLQ\t[$]9"
// arm64:"ROR\t[$]55"
// s390x:"RLLG\t[$]9"
// ppc64le:"ROTL\t[$]9"
a += x<<9 ^ x>>55
return a
}
func rot32(x uint32) uint32 {
var a uint32
// amd64:"ROLL\t[$]7"
// arm:"MOVW\tR\\d+@>25"
// arm64:"RORW\t[$]25"
// s390x:"RLL\t[$]7"
// ppc64le:"ROTLW\t[$]7"
a += x<<7 | x>>25
// amd64:`ROLL\t[$]8`
// arm:"MOVW\tR\\d+@>24"
// arm64:"RORW\t[$]24"
// s390x:"RLL\t[$]8"
// ppc64le:"ROTLW\t[$]8"
a += x<<8 + x>>24
// amd64:"ROLL\t[$]9"
// arm:"MOVW\tR\\d+@>23"
// arm64:"RORW\t[$]23"
// s390x:"RLL\t[$]9"
// ppc64le:"ROTLW\t[$]9"
a += x<<9 ^ x>>23
return a
}
func rot16(x uint16) uint16 {
var a uint16
// amd64:"ROLW\t[$]7"
a += x<<7 | x>>9
// amd64:`ROLW\t[$]8`
a += x<<8 + x>>8
// amd64:"ROLW\t[$]9"
a += x<<9 ^ x>>7
return a
}
func rot8(x uint8) uint8 {
var a uint8
// amd64:"ROLB\t[$]5"
a += x<<5 | x>>3
// amd64:`ROLB\t[$]6`
a += x<<6 + x>>2
// amd64:"ROLB\t[$]7"
a += x<<7 ^ x>>1
return a
}
// ----------------------- //
// non-const rotates //
// ----------------------- //
func rot64nc(x uint64, z uint) uint64 {
var a uint64
z &= 63
// amd64:"ROLQ"
// ppc64le:"ROTL"
a += x<<z | x>>(64-z)
// amd64:"RORQ"
a += x>>z | x<<(64-z)
return a
}
func rot32nc(x uint32, z uint) uint32 {
var a uint32
z &= 31
// amd64:"ROLL"
// ppc64le:"ROTLW"
a += x<<z | x>>(32-z)
// amd64:"RORL"
a += x>>z | x<<(32-z)
return a
}
func rot16nc(x uint16, z uint) uint16 {
var a uint16
z &= 15
// amd64:"ROLW"
a += x<<z | x>>(16-z)
// amd64:"RORW"
a += x>>z | x<<(16-z)
return a
}
func rot8nc(x uint8, z uint) uint8 {
var a uint8
z &= 7
// amd64:"ROLB"
a += x<<z | x>>(8-z)
// amd64:"RORB"
a += x>>z | x<<(8-z)
return a
}
// Issue 18254: rotate after inlining
func f32(x uint32) uint32 {
// amd64:"ROLL\t[$]7"
return rot32nc(x, 7)
}