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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
// ------------------ //
// masked shifts //
// ------------------ //
func lshMask64x64(v int64, s uint64) int64 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// ppc64:"ANDCC",-"ORN",-"ISEL"
return v << (s & 63)
}
func rshMask64Ux64(v uint64, s uint64) uint64 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// ppc64:"ANDCC",-"ORN",-"ISEL"
return v >> (s & 63)
}
func rshMask64x64(v int64, s uint64) int64 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ANDCC",-ORN",-"ISEL"
// ppc64:"ANDCC",-"ORN",-"ISEL"
return v >> (s & 63)
}
func lshMask32x64(v int32, s uint64) int32 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ISEL",-"ORN"
// ppc64:"ISEL",-"ORN"
return v << (s & 63)
}
func rshMask32Ux64(v uint32, s uint64) uint32 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ISEL",-"ORN"
// ppc64:"ISEL",-"ORN"
return v >> (s & 63)
}
func rshMask32x64(v int32, s uint64) int32 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ISEL",-"ORN"
// ppc64:"ISEL",-"ORN"
return v >> (s & 63)
}
func lshMask64x32(v int64, s uint32) int64 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ANDCC",-"ORN"
// ppc64:"ANDCC",-"ORN"
return v << (s & 63)
}
func rshMask64Ux32(v uint64, s uint32) uint64 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ANDCC",-"ORN"
// ppc64:"ANDCC",-"ORN"
return v >> (s & 63)
}
func rshMask64x32(v int64, s uint32) int64 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// ppc64:"ANDCC",-"ORN",-"ISEL"
return v >> (s & 63)
}
func lshMask64x32Ext(v int64, s int32) int64 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// ppc64:"ANDCC",-"ORN",-"ISEL"
return v << uint(s&63)
}
func rshMask64Ux32Ext(v uint64, s int32) uint64 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// ppc64:"ANDCC",-"ORN",-"ISEL"
return v >> uint(s&63)
}
func rshMask64x32Ext(v int64, s int32) int64 {
// s390x:-".*AND",-".*MOVDGE"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// ppc64:"ANDCC",-"ORN",-"ISEL"
return v >> uint(s&63)
}
// --------------- //
// signed shifts //
// --------------- //
// We do want to generate a test + panicshift for these cases.
func lshSigned(v8 int8, v16 int16, v32 int32, v64 int64, x int) {
// amd64:"TESTB"
_ = x << v8
// amd64:"TESTW"
_ = x << v16
// amd64:"TESTL"
_ = x << v32
// amd64:"TESTQ"
_ = x << v64
}
// We want to avoid generating a test + panicshift for these cases.
func lshSignedMasked(v8 int8, v16 int16, v32 int32, v64 int64, x int) {
// amd64:-"TESTB"
_ = x << (v8 & 7)
// amd64:-"TESTW"
_ = x << (v16 & 15)
// amd64:-"TESTL"
_ = x << (v32 & 31)
// amd64:-"TESTQ"
_ = x << (v64 & 63)
}
// ------------------ //
// bounded shifts //
// ------------------ //
func rshGuarded64(v int64, s uint) int64 {
if s < 64 {
// s390x:-".*AND",-".*MOVDGE" wasm:-"Select",-".*LtU"
return v >> s
}
panic("shift too large")
}
func rshGuarded64U(v uint64, s uint) uint64 {
if s < 64 {
// s390x:-".*AND",-".*MOVDGE" wasm:-"Select",-".*LtU"
return v >> s
}
panic("shift too large")
}
func lshGuarded64(v int64, s uint) int64 {
if s < 64 {
// s390x:-".*AND",-".*MOVDGE" wasm:-"Select",-".*LtU"
return v << s
}
panic("shift too large")
}
func checkWidenAfterShift(v int64, u uint64) (int64, uint64) {
// ppc64le:-".*MOVW"
f := int32(v>>32)
// ppc64le:".*MOVW"
f += int32(v>>31)
// ppc64le:-".*MOVH"
g := int16(v>>48)
// ppc64le:".*MOVH"
g += int16(v>>30)
// ppc64le:-".*MOVH"
g += int16(f>>16)
// ppc64le:-".*MOVB"
h := int8(v>>56)
// ppc64le:".*MOVB"
h += int8(v>>28)
// ppc64le:-".*MOVB"
h += int8(f>>24)
// ppc64le:".*MOVB"
h += int8(f>>16)
return int64(h),uint64(g)
}
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