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go/test/codegen/bitfield.go
fanzha02 2091bd3f26 cmd/compile: simiplify arm64 bitfield optimizations 
In some rewrite rules for arm64 bitfield optimizations, the
bitfield lsb value and the bitfield width value are related
to datasize, some of them use datasize directly to check the
bitfield lsb value is valid, to get the bitfiled width value,
but some of them call isARM64BFMask() and arm64BFWidth()
functions. In order to be consistent, this patch changes them
all to use datasize.

Besides, this patch sorts the codegen test cases.

Run the "toolstash-check -all" command and find one inconsistent code
is as the following.

new:    src/math/fma.go:104      BEQ	247
master: src/math/fma.go:104      BEQ	248

The above inconsistence is due to this patch changing the range of the
field lsb value in "UBFIZ" optimization rules from "lc+(32|16|8)<64" to
"lc<64", so that the following code is generated as "UBFIZ". The logical
of changed code is still correct.

The code of src/math/fma.go:160:
  const uvinf = 0x7FF0000000000000
  func FMA(a, b uint32) float64 {
  	ps := a+b
  	return Float64frombits(uint64(ps)<<63 | uvinf)
  }

The new assembly code:
  TEXT    "".FMA(SB), LEAF|NOFRAME|ABIInternal, $0-16
  MOVWU   "".a(FP), R0
  MOVWU   "".b+4(FP), R1
  ADD     R1, R0, R0
  UBFIZ   $63, R0, $1, R0
  ORR     $9218868437227405312, R0, R0
  MOVD    R0, "".~r2+8(FP)
  RET     (R30)

The master assembly code:
  TEXT    "".FMA(SB), LEAF|NOFRAME|ABIInternal, $0-16
  MOVWU   "".a(FP), R0
  MOVWU   "".b+4(FP), R1
  ADD     R1, R0, R0
  MOVWU   R0, R0
  LSL     $63, R0, R0
  ORR     $9218868437227405312, R0, R0
  MOVD    R0, "".~r2+8(FP)
  RET     (R30)

Change-Id: I9061104adfdfd3384d0525327ae1e5c8b0df5c35
Reviewed-on: https://go-review.googlesource.com/c/go/+/265038
Trust: fannie zhang <Fannie.Zhang@arm.com>
Run-TryBot: fannie zhang <Fannie.Zhang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2021-09-10 02:44:36 +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
// This file contains codegen tests related to bit field
// insertion/extraction simplifications/optimizations.
func extr1(x, x2 uint64) uint64 {
return x<<7 + x2>>57 // arm64:"EXTR\t[$]57,"
}
func extr2(x, x2 uint64) uint64 {
return x<<7 | x2>>57 // arm64:"EXTR\t[$]57,"
}
func extr3(x, x2 uint64) uint64 {
return x<<7 ^ x2>>57 // arm64:"EXTR\t[$]57,"
}
func extr4(x, x2 uint32) uint32 {
return x<<7 + x2>>25 // arm64:"EXTRW\t[$]25,"
}
func extr5(x, x2 uint32) uint32 {
return x<<7 | x2>>25 // arm64:"EXTRW\t[$]25,"
}
func extr6(x, x2 uint32) uint32 {
return x<<7 ^ x2>>25 // arm64:"EXTRW\t[$]25,"
}
// check 32-bit shift masking
func mask32(x uint32) uint32 {
return (x << 29) >> 29 // arm64:"AND\t[$]7, R[0-9]+",-"LSR",-"LSL"
}
// check 16-bit shift masking
func mask16(x uint16) uint16 {
return (x << 14) >> 14 // arm64:"AND\t[$]3, R[0-9]+",-"LSR",-"LSL"
}
// check 8-bit shift masking
func mask8(x uint8) uint8 {
return (x << 7) >> 7 // arm64:"AND\t[$]1, R[0-9]+",-"LSR",-"LSL"
}
func maskshift(x uint64) uint64 {
// arm64:"AND\t[$]4095, R[0-9]+",-"LSL",-"LSR",-"UBFIZ",-"UBFX"
return ((x << 5) & (0xfff << 5)) >> 5
}
// bitfield ops
// bfi
func bfi1(x, y uint64) uint64 {
// arm64:"BFI\t[$]4, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
return ((x & 0xfff) << 4) | (y & 0xffffffffffff000f)
}
func bfi2(x, y uint64) uint64 {
// arm64:"BFI\t[$]12, R[0-9]+, [$]40",-"LSL",-"LSR",-"AND"
return (x << 24 >> 12) | (y & 0xfff0000000000fff)
}
// bfxil
func bfxil1(x, y uint64) uint64 {
// arm64:"BFXIL\t[$]5, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
return ((x >> 5) & 0xfff) | (y & 0xfffffffffffff000)
}
func bfxil2(x, y uint64) uint64 {
// arm64:"BFXIL\t[$]12, R[0-9]+, [$]40",-"LSL",-"LSR",-"AND"
return (x << 12 >> 24) | (y & 0xffffff0000000000)
}
// sbfiz
// merge shifts into sbfiz: (x << lc) >> rc && lc > rc.
func sbfiz1(x int64) int64 {
// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR"
return (x << 4) >> 3
}
// merge shift and sign-extension into sbfiz.
func sbfiz2(x int32) int64 {
return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]29",-"LSL"
}
func sbfiz3(x int16) int64 {
return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]13",-"LSL"
}
func sbfiz4(x int8) int64 {
return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]5",-"LSL"
}
// sbfiz combinations.
// merge shift with sbfiz into sbfiz.
func sbfiz5(x int32) int32 {
// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
return (x << 4) >> 3
}
func sbfiz6(x int16) int64 {
return int64(x+1) << 3 // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]16",-"LSL"
}
func sbfiz7(x int8) int64 {
return int64(x+1) << 62 // arm64:"SBFIZ\t[$]62, R[0-9]+, [$]2",-"LSL"
}
func sbfiz8(x int32) int64 {
return int64(x+1) << 40 // arm64:"SBFIZ\t[$]40, R[0-9]+, [$]24",-"LSL"
}
// sbfx
// merge shifts into sbfx: (x << lc) >> rc && lc <= rc.
func sbfx1(x int64) int64 {
return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR"
}
func sbfx2(x int64) int64 {
return (x << 60) >> 60 // arm64:"SBFX\tZR, R[0-9]+, [$]4",-"LSL",-"ASR"
}
// merge shift and sign-extension into sbfx.
func sbfx3(x int32) int64 {
return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]29",-"ASR"
}
func sbfx4(x int16) int64 {
return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]13",-"ASR"
}
func sbfx5(x int8) int64 {
return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]5",-"ASR"
}
func sbfx6(x int32) int64 {
return int64(x >> 30) // arm64:"SBFX\t[$]30, R[0-9]+, [$]2"
}
func sbfx7(x int16) int64 {
return int64(x >> 10) // arm64:"SBFX\t[$]10, R[0-9]+, [$]6"
}
func sbfx8(x int8) int64 {
return int64(x >> 5) // arm64:"SBFX\t[$]5, R[0-9]+, [$]3"
}
// sbfx combinations.
// merge shifts with sbfiz into sbfx.
func sbfx9(x int32) int32 {
return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
}
// merge sbfx and sign-extension into sbfx.
func sbfx10(x int32) int64 {
c := x + 5
return int64(c >> 20) // arm64"SBFX\t[$]20, R[0-9]+, [$]12",-"MOVW\tR[0-9]+, R[0-9]+"
}
// ubfiz
// merge shifts into ubfiz: (x<<lc)>>rc && lc>rc
func ubfiz1(x uint64) uint64 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]3, [$]62, [$]1, ",-"SLD",-"SRD"
return (x << 4) >> 3
}
// merge shift and zero-extension into ubfiz.
func ubfiz2(x uint32) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]32",-"LSL"
}
func ubfiz3(x uint16) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]16",-"LSL"
}
func ubfiz4(x uint8) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]8",-"LSL"
}
func ubfiz5(x uint8) uint64 {
return uint64(x) << 60 // arm64:"UBFIZ\t[$]60, R[0-9]+, [$]4",-"LSL"
}
func ubfiz6(x uint32) uint64 {
return uint64(x << 30) // arm64:"UBFIZ\t[$]30, R[0-9]+, [$]2",
}
func ubfiz7(x uint16) uint64 {
return uint64(x << 10) // arm64:"UBFIZ\t[$]10, R[0-9]+, [$]6",
}
func ubfiz8(x uint8) uint64 {
return uint64(x << 7) // arm64:"UBFIZ\t[$]7, R[0-9]+, [$]1",
}
// merge ANDconst into ubfiz.
func ubfiz9(x uint64) uint64 {
// arm64:"UBFIZ\t[$]3, R[0-9]+, [$]12",-"LSL",-"AND"
// s390x:"RISBGZ\t[$]49, [$]60, [$]3,",-"SLD",-"AND"
return (x & 0xfff) << 3
}
func ubfiz10(x uint64) uint64 {
// arm64:"UBFIZ\t[$]4, R[0-9]+, [$]12",-"LSL",-"AND"
// s390x:"RISBGZ\t[$]48, [$]59, [$]4,",-"SLD",-"AND"
return (x << 4) & 0xfff0
}
// ubfiz combinations
func ubfiz11(x uint32) uint32 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"LSR"
return (x << 4) >> 3
}
func ubfiz12(x uint64) uint64 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]20",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]43, [$]62, [$]1, ",-"SLD",-"SRD",-"AND"
return ((x & 0xfffff) << 4) >> 3
}
func ubfiz13(x uint64) uint64 {
// arm64:"UBFIZ\t[$]5, R[0-9]+, [$]13",-"LSL",-"LSR",-"AND"
return ((x << 3) & 0xffff) << 2
}
func ubfiz14(x uint64) uint64 {
// arm64:"UBFIZ\t[$]7, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]45, [$]56, [$]7, ",-"SLD",-"SRD",-"AND"
return ((x << 5) & (0xfff << 5)) << 2
}
// ubfx
// merge shifts into ubfx: (x<<lc)>>rc && lc<rc
func ubfx1(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]62",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]2, [$]63, [$]63,",-"SLD",-"SRD"
return (x << 1) >> 2
}
// merge shift and zero-extension into ubfx.
func ubfx2(x uint32) uint64 {
return uint64(x >> 15) // arm64:"UBFX\t[$]15, R[0-9]+, [$]17",-"LSR"
}
func ubfx3(x uint16) uint64 {
return uint64(x >> 9) // arm64:"UBFX\t[$]9, R[0-9]+, [$]7",-"LSR"
}
func ubfx4(x uint8) uint64 {
return uint64(x >> 3) // arm64:"UBFX\t[$]3, R[0-9]+, [$]5",-"LSR"
}
func ubfx5(x uint32) uint64 {
return uint64(x) >> 30 // arm64:"UBFX\t[$]30, R[0-9]+, [$]2"
}
func ubfx6(x uint16) uint64 {
return uint64(x) >> 10 // arm64:"UBFX\t[$]10, R[0-9]+, [$]6"
}
func ubfx7(x uint8) uint64 {
return uint64(x) >> 3 // arm64:"UBFX\t[$]3, R[0-9]+, [$]5"
}
// merge ANDconst into ubfx.
func ubfx8(x uint64) uint64 {
// arm64:"UBFX\t[$]25, R[0-9]+, [$]10",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]54, [$]63, [$]39, ",-"SRD",-"AND"
return (x >> 25) & 1023
}
func ubfx9(x uint64) uint64 {
// arm64:"UBFX\t[$]4, R[0-9]+, [$]8",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]56, [$]63, [$]60, ",-"SRD",-"AND"
return (x & 0x0ff0) >> 4
}
// ubfx combinations.
func ubfx10(x uint32) uint32 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]30",-"LSL",-"LSR"
return (x << 1) >> 2
}
func ubfx11(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]52, [$]63, [$]63,",-"SLD",-"SRD",-"AND"
return ((x << 1) >> 2) & 0xfff
}
func ubfx12(x uint64) uint64 {
// arm64:"UBFX\t[$]4, R[0-9]+, [$]11",-"LSL",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]53, [$]63, [$]60, ",-"SLD",-"SRD",-"AND"
return ((x >> 3) & 0xfff) >> 1
}
func ubfx13(x uint64) uint64 {
// arm64:"UBFX\t[$]5, R[0-9]+, [$]56",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]8, [$]63, [$]59, ",-"SLD",-"SRD"
return ((x >> 2) << 5) >> 8
}
func ubfx14(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]19",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]45, [$]63, [$]63, ",-"SLD",-"SRD",-"AND"
return ((x & 0xfffff) << 3) >> 4
}
// merge ubfx and zero-extension into ubfx.
func ubfx15(x uint64) bool {
midr := x + 10
part_num := uint16((midr >> 4) & 0xfff)
if part_num == 0xd0c { // arm64:"UBFX\t[$]4, R[0-9]+, [$]12",-"MOVHU\tR[0-9]+, R[0-9]+"
return true
}
return false
}
// Check that we don't emit comparisons for constant shifts.
//go:nosplit
func shift_no_cmp(x int) int {
// arm64:`LSL\t[$]17`,-`CMP`
// mips64:`SLLV\t[$]17`,-`SGT`
return x << 17
}
func rev16(c uint64) (uint64, uint64, uint64) {
// arm64:`REV16`,-`AND`,-`LSR`,-`AND`,-`ORR\tR[0-9]+<<8`
b1 := ((c & 0xff00ff00ff00ff00) >> 8) | ((c & 0x00ff00ff00ff00ff) << 8)
// arm64:-`ADD\tR[0-9]+<<8`
b2 := ((c & 0xff00ff00ff00ff00) >> 8) + ((c & 0x00ff00ff00ff00ff) << 8)
// arm64:-`EOR\tR[0-9]+<<8`
b3 := ((c & 0xff00ff00ff00ff00) >> 8) ^ ((c & 0x00ff00ff00ff00ff) << 8)
return b1, b2, b3
}
func rev16w(c uint32) (uint32, uint32, uint32) {
// arm64:`REV16W`,-`AND`,-`UBFX`,-`AND`,-`ORR\tR[0-9]+<<8`
b1 := ((c & 0xff00ff00) >> 8) | ((c & 0x00ff00ff) << 8)
// arm64:-`ADD\tR[0-9]+<<8`
b2 := ((c & 0xff00ff00) >> 8) + ((c & 0x00ff00ff) << 8)
// arm64:-`EOR\tR[0-9]+<<8`
b3 := ((c & 0xff00ff00) >> 8) ^ ((c & 0x00ff00ff) << 8)
return b1, b2, b3
}
func shift(x uint32, y uint16, z uint8) uint64 {
// arm64:-`MOVWU`,-`LSR\t[$]32`
a := uint64(x) >> 32
// arm64:-`MOVHU
b := uint64(y) >> 16
// arm64:-`MOVBU`
c := uint64(z) >> 8
// arm64:`MOVD\tZR`,-`ADD\tR[0-9]+>>16`,-`ADD\tR[0-9]+>>8`,
return a + b + c
}
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