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go/test/codegen/shift.go
Joel Sing d413908320 test/codegen: add shift tests for RISCV64 
Add tests for shift by constant, masked shifts and bounded shifts. While here,
sort tests by architecture and keep order of tests consistent (lsh, rshU, rsh).

Change-Id: I512d64196f34df9cb2884e8c0f6adcf9dd88b0fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/351289
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Michael Munday <mike.munday@lowrisc.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
2021-09-24 07:22:13 +00:00

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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
// ------------------ //
// constant shifts //
// ------------------ //
func lshConst64x64(v int64) int64 {
// riscv64:"SLL","AND","SLTIU"
return v << uint64(33)
}
func rshConst64Ux64(v uint64) uint64 {
// riscv64:"SRL","AND","SLTIU"
return v >> uint64(33)
}
func rshConst64x64(v int64) int64 {
// riscv64:"SRA","OR","SLTIU"
return v >> uint64(33)
}
func lshConst32x64(v int32) int32 {
// riscv64:"SLL","AND","SLTIU"
return v << uint64(29)
}
func rshConst32Ux64(v uint32) uint32 {
// riscv64:"SRL","AND","SLTIU"
return v >> uint64(29)
}
func rshConst32x64(v int32) int32 {
// riscv64:"SRA","OR","SLTIU"
return v >> uint64(29)
}
func lshConst64x32(v int64) int64 {
// riscv64:"SLL","AND","SLTIU"
return v << uint32(33)
}
func rshConst64Ux32(v uint64) uint64 {
// riscv64:"SRL","AND","SLTIU"
return v >> uint32(33)
}
func rshConst64x32(v int64) int64 {
// riscv64:"SRA","OR","SLTIU"
return v >> uint32(33)
}
// ------------------ //
// masked shifts //
// ------------------ //
func lshMask64x64(v int64, s uint64) int64 {
// ppc64:"ANDCC",-"ORN",-"ISEL"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// riscv64:"SLL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v << (s & 63)
}
func rshMask64Ux64(v uint64, s uint64) uint64 {
// ppc64:"ANDCC",-"ORN",-"ISEL"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// riscv64:"SRL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func rshMask64x64(v int64, s uint64) int64 {
// ppc64:"ANDCC",-"ORN",-"ISEL"
// ppc64le:"ANDCC",-ORN",-"ISEL"
// riscv64:"SRA","OR","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func lshMask32x64(v int32, s uint64) int32 {
// ppc64:"ISEL",-"ORN"
// ppc64le:"ISEL",-"ORN"
// riscv64:"SLL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v << (s & 63)
}
func rshMask32Ux64(v uint32, s uint64) uint32 {
// ppc64:"ISEL",-"ORN"
// ppc64le:"ISEL",-"ORN"
// riscv64:"SRL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func rshMask32x64(v int32, s uint64) int32 {
// ppc64:"ISEL",-"ORN"
// ppc64le:"ISEL",-"ORN"
// riscv64:"SRA","OR","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func lshMask64x32(v int64, s uint32) int64 {
// ppc64:"ANDCC",-"ORN"
// ppc64le:"ANDCC",-"ORN"
// riscv64:"SLL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v << (s & 63)
}
func rshMask64Ux32(v uint64, s uint32) uint64 {
// ppc64:"ANDCC",-"ORN"
// ppc64le:"ANDCC",-"ORN"
// riscv64:"SRL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func rshMask64x32(v int64, s uint32) int64 {
// ppc64:"ANDCC",-"ORN",-"ISEL"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// riscv64:"SRA","OR","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func lshMask64x32Ext(v int64, s int32) int64 {
// ppc64:"ANDCC",-"ORN",-"ISEL"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// riscv64:"SLL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v << uint(s&63)
}
func rshMask64Ux32Ext(v uint64, s int32) uint64 {
// ppc64:"ANDCC",-"ORN",-"ISEL"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// riscv64:"SRL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> uint(s&63)
}
func rshMask64x32Ext(v int64, s int32) int64 {
// ppc64:"ANDCC",-"ORN",-"ISEL"
// ppc64le:"ANDCC",-"ORN",-"ISEL"
// riscv64:"SRA","OR","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
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 lshGuarded64(v int64, s uint) int64 {
if s < 64 {
// riscv64:"SLL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
// wasm:-"Select",-".*LtU"
return v << s
}
panic("shift too large")
}
func rshGuarded64U(v uint64, s uint) uint64 {
if s < 64 {
// riscv64:"SRL","AND","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
// wasm:-"Select",-".*LtU"
return v >> s
}
panic("shift too large")
}
func rshGuarded64(v int64, s uint) int64 {
if s < 64 {
// riscv64:"SRA","OR","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
// wasm:-"Select",-".*LtU"
return v >> s
}
panic("shift too large")
}
func checkUnneededTrunc(tab *[100000]uint32, d uint64, v uint32, h uint16, b byte) (uint32, uint64) {
// ppc64le:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
// ppc64:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f := tab[byte(v)^b]
// ppc64le:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
// ppc64:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[byte(v)&b]
// ppc64le:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
// ppc64:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[byte(v)|b]
// ppc64le:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
// ppc64:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[uint16(v)&h]
// ppc64le:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
// ppc64:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[uint16(v)^h]
// ppc64le:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
// ppc64:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[uint16(v)|h]
// ppc64le:-".*AND",-"RLDICR",".*CLRLSLDI"
// ppc64:-".*AND",-"RLDICR",".*CLRLSLDI"
f += tab[v&0xff]
// ppc64le:-".*AND",".*CLRLSLWI"
// ppc64:-".*AND",".*CLRLSLWI"
f += 2 * uint32(uint16(d))
// ppc64le:-".*AND",-"RLDICR",".*CLRLSLDI"
// ppc64:-".*AND",-"RLDICR",".*CLRLSLDI"
g := 2 * uint64(uint32(d))
return f, g
}
func checkCombinedShifts(v8 uint8, v16 uint16, v32 uint32, x32 int32, v64 uint64) (uint8, uint16, uint32, uint64, int64) {
// ppc64le:-"AND","CLRLSLWI"
// ppc64:-"AND","CLRLSLWI"
f := (v8 & 0xF) << 2
// ppc64le:"CLRLSLWI"
// ppc64:"CLRLSLWI"
f += byte(v16) << 3
// ppc64le:-"AND","CLRLSLWI"
// ppc64:-"AND","CLRLSLWI"
g := (v16 & 0xFF) << 3
// ppc64le:-"AND","CLRLSLWI"
// ppc64:-"AND","CLRLSLWI"
h := (v32 & 0xFFFFF) << 2
// ppc64le:"CLRLSLDI"
// ppc64:"CLRLSLDI"
i := (v64 & 0xFFFFFFFF) << 5
// ppc64le:-"CLRLSLDI"
// ppc64:-"CLRLSLDI"
i += (v64 & 0xFFFFFFF) << 38
// ppc64le/power9:-"CLRLSLDI"
// ppc64/power9:-"CLRLSLDI"
i += (v64 & 0xFFFF00) << 10
// ppc64le/power9:-"SLD","EXTSWSLI"
// ppc64/power9:-"SLD","EXTSWSLI"
j := int64(x32+32) * 8
return f, g, h, i, j
}
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)
}
func checkShiftAndMask32(v []uint32) {
i := 0
// ppc64le: "RLWNM\t[$]24, R[0-9]+, [$]12, [$]19, R[0-9]+"
// ppc64: "RLWNM\t[$]24, R[0-9]+, [$]12, [$]19, R[0-9]+"
v[i] = (v[i] & 0xFF00000) >> 8
i++
// ppc64le: "RLWNM\t[$]26, R[0-9]+, [$]22, [$]29, R[0-9]+"
// ppc64: "RLWNM\t[$]26, R[0-9]+, [$]22, [$]29, R[0-9]+"
v[i] = (v[i] & 0xFF00) >> 6
i++
// ppc64le: "MOVW\tR0"
// ppc64: "MOVW\tR0"
v[i] = (v[i] & 0xFF) >> 8
i++
// ppc64le: "MOVW\tR0"
// ppc64: "MOVW\tR0"
v[i] = (v[i] & 0xF000000) >> 28
i++
// ppc64le: "RLWNM\t[$]26, R[0-9]+, [$]24, [$]31, R[0-9]+"
// ppc64: "RLWNM\t[$]26, R[0-9]+, [$]24, [$]31, R[0-9]+"
v[i] = (v[i] >> 6) & 0xFF
i++
// ppc64le: "RLWNM\t[$]26, R[0-9]+, [$]12, [$]19, R[0-9]+"
// ppc64: "RLWNM\t[$]26, R[0-9]+, [$]12, [$]19, R[0-9]+"
v[i] = (v[i] >> 6) & 0xFF000
i++
// ppc64le: "MOVW\tR0"
// ppc64: "MOVW\tR0"
v[i] = (v[i] >> 20) & 0xFF000
i++
// ppc64le: "MOVW\tR0"
// ppc64: "MOVW\tR0"
v[i] = (v[i] >> 24) & 0xFF00
i++
}
func checkMergedShifts32(a [256]uint32, b [256]uint64, u uint32, v uint32) {
//ppc64le: -"CLRLSLDI", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]29, R[0-9]+"
//ppc64: -"CLRLSLDI", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]29, R[0-9]+"
a[0] = a[uint8(v>>24)]
//ppc64le: -"CLRLSLDI", "RLWNM\t[$]11, R[0-9]+, [$]21, [$]28, R[0-9]+"
//ppc64: -"CLRLSLDI", "RLWNM\t[$]11, R[0-9]+, [$]21, [$]28, R[0-9]+"
b[0] = b[uint8(v>>24)]
//ppc64le: -"CLRLSLDI", "RLWNM\t[$]15, R[0-9]+, [$]21, [$]28, R[0-9]+"
//ppc64: -"CLRLSLDI", "RLWNM\t[$]15, R[0-9]+, [$]21, [$]28, R[0-9]+"
b[1] = b[(v>>20)&0xFF]
//ppc64le: -"SLD", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]28, R[0-9]+"
//ppc64: -"SLD", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]28, R[0-9]+"
b[2] = b[v>>25]
}
// 128 bit shifts
func check128bitShifts(x, y uint64, bits uint) (uint64, uint64) {
s := bits & 63
ŝ := (64 - bits) & 63
// check that the shift operation has two commas (three operands)
// amd64:"SHRQ.*,.*,"
shr := x>>s | y<<ŝ
// amd64:"SHLQ.*,.*,"
shl := x<<s | y>>ŝ
return shr, shl
}
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