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02820d61a9
go/test/codegen/bitfield.go
Michael Munday 854e892ce1 cmd/compile: optimize shift pairs and masks on s390x 
Optimize combinations of left and right shifts by a constant value
into a 'rotate then insert selected bits [into zero]' instruction.
Use the same instruction for contiguous masks since it has some
benefits over 'and immediate' (not restricted to 32-bits, does not
overwrite source register).

To keep the complexity of this change under control I've only
implemented 64 bit operations for now.

There are a lot more optimizations that can be done with this
instruction family. However, since their function overlaps with other
instructions we need to be somewhat careful not to break existing
optimization rules by creating optimization dead ends. This is
particularly true of the load/store merging rules which contain lots
of zero extensions and shifts.

This CL does interfere with the store merging rules when an operand
is shifted left before it is stored:

  binary.BigEndian.PutUint64(b, x << 1)

This is unfortunate but it's not critical and somewhat complex so
I plan to fix that in a follow up CL.

file      before    after     Δ       %
addr2line 4117446   4117282   -164    -0.004%
api       4945184   4942752   -2432   -0.049%
asm       4998079   4991891   -6188   -0.124%
buildid   2685158   2684074   -1084   -0.040%
cgo       4553732   4553394   -338    -0.007%
compile   19294446  19245070  -49376  -0.256%
cover     4897105   4891319   -5786   -0.118%
dist      3544389   3542785   -1604   -0.045%
doc       3926795   3927617   +822    +0.021%
fix       3302958   3293868   -9090   -0.275%
link      6546274   6543456   -2818   -0.043%
nm        4102021   4100825   -1196   -0.029%
objdump   4542431   4548483   +6052   +0.133%
pack      2482465   2416389   -66076  -2.662%
pprof     13366541  13363915  -2626   -0.020%
test2json 2829007   2761515   -67492  -2.386%
trace     10216164  10219684  +3520   +0.034%
vet       6773956   6773572   -384    -0.006%
total     107124151 106917891 -206260 -0.193%

Change-Id: I7591cce41e06867ba10a745daae9333513062746
Reviewed-on: https://go-review.googlesource.com/c/go/+/233317
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Michael Munday <mike.munday@ibm.com>
2020-11-06 10:45:31 +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
func sbfiz1(x int64) int64 {
// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR"
return (x << 4) >> 3
}
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"
}
func sbfiz5(x int32) int32 {
// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
return (x << 4) >> 3
}
// sbfx
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]+, [$]4",-"LSL",-"ASR"
}
func sbfx3(x int32) int64 {
return int64(x) >> 3 // arm64:"SBFX\t[$]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]+, [$]5",-"ASR"
}
func sbfx6(x int32) int32 {
return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
}
// ubfiz
func ubfiz1(x uint64) uint64 {
// arm64:"UBFIZ\t[$]3, R[0-9]+, [$]12",-"LSL",-"AND"
// s390x:"RISBGZ\t[$]49, [$]60, [$]3,",-"SLD",-"AND"
return (x & 0xfff) << 3
}
func ubfiz2(x uint64) uint64 {
// arm64:"UBFIZ\t[$]4, R[0-9]+, [$]12",-"LSL",-"AND"
// s390x:"RISBGZ\t[$]48, [$]59, [$]4,",-"SLD",-"AND"
return (x << 4) & 0xfff0
}
func ubfiz3(x uint32) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]32",-"LSL"
}
func ubfiz4(x uint16) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]16",-"LSL"
}
func ubfiz5(x uint8) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]8",-"LSL"
}
func ubfiz6(x uint64) uint64 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]3, [$]62, [$]1, ",-"SLD",-"SRD"
return (x << 4) >> 3
}
func ubfiz7(x uint32) uint32 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"LSR"
return (x << 4) >> 3
}
func ubfiz8(x uint64) uint64 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]20",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]43, [$]62, [$]1, ",-"SLD",-"SRD",-"AND"
return ((x & 0xfffff) << 4) >> 3
}
func ubfiz9(x uint64) uint64 {
// arm64:"UBFIZ\t[$]5, R[0-9]+, [$]13",-"LSL",-"LSR",-"AND"
return ((x << 3) & 0xffff) << 2
}
func ubfiz10(x uint64) uint64 {
// arm64:"UBFIZ\t[$]7, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]45, [$]56, [$]7, ",-"SLD",-"SRD",-"AND"
return ((x << 5) & (0xfff << 5)) << 2
}
// ubfx
func ubfx1(x uint64) uint64 {
// arm64:"UBFX\t[$]25, R[0-9]+, [$]10",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]54, [$]63, [$]39, ",-"SRD",-"AND"
return (x >> 25) & 1023
}
func ubfx2(x uint64) uint64 {
// arm64:"UBFX\t[$]4, R[0-9]+, [$]8",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]56, [$]63, [$]60, ",-"SRD",-"AND"
return (x & 0x0ff0) >> 4
}
func ubfx3(x uint32) uint64 {
return uint64(x >> 15) // arm64:"UBFX\t[$]15, R[0-9]+, [$]17",-"LSR"
}
func ubfx4(x uint16) uint64 {
return uint64(x >> 9) // arm64:"UBFX\t[$]9, R[0-9]+, [$]7",-"LSR"
}
func ubfx5(x uint8) uint64 {
return uint64(x >> 3) // arm64:"UBFX\t[$]3, R[0-9]+, [$]5",-"LSR"
}
func ubfx6(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]62",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]2, [$]63, [$]63,",-"SLD",-"SRD"
return (x << 1) >> 2
}
func ubfx7(x uint32) uint32 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]30",-"LSL",-"LSR"
return (x << 1) >> 2
}
func ubfx8(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]52, [$]63, [$]63,",-"SLD",-"SRD",-"AND"
return ((x << 1) >> 2) & 0xfff
}
func ubfx9(x uint64) uint64 {
// arm64:"UBFX\t[$]4, R[0-9]+, [$]11",-"LSL",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]53, [$]63, [$]60, ",-"SLD",-"SRD",-"AND"
return ((x >> 3) & 0xfff) >> 1
}
func ubfx10(x uint64) uint64 {
// arm64:"UBFX\t[$]5, R[0-9]+, [$]56",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]8, [$]63, [$]59, ",-"SLD",-"SRD"
return ((x >> 2) << 5) >> 8
}
func ubfx11(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]19",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]45, [$]63, [$]63, ",-"SLD",-"SRD",-"AND"
return ((x & 0xfffff) << 3) >> 4
}
// Check that we don't emit comparisons for constant shifts.
//go:nosplit
func shift_no_cmp(x int) int {
// arm64:`LSL\t[$]17`,-`CMP`
// mips64:`SLLV\t[$]17`,-`SGT`
return x << 17
}
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