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go/test/codegen/bitfield.go
Geoff Berry e244a7a7d3 cmd/compile/internal/ssa: add patterns for arm64 bitfield opcodes 
Add patterns to match common idioms for EXTR, BFI, BFXIL, SBFIZ, SBFX,
UBFIZ and UBFX opcodes.

go1 benchmarks results on Amberwing:
name                   old time/op    new time/op    delta
FmtManyArgs               786ns ± 2%     714ns ± 1%  -9.20%  (p=0.000 n=10+10)
Gzip                      437ms ± 0%     402ms ± 0%  -7.99%  (p=0.000 n=10+10)
FmtFprintfIntInt          196ns ± 0%     182ns ± 0%  -7.28%  (p=0.000 n=10+9)
FmtFprintfPrefixedInt     207ns ± 0%     199ns ± 0%  -3.86%  (p=0.000 n=10+10)
FmtFprintfFloat           324ns ± 0%     316ns ± 0%  -2.47%  (p=0.000 n=10+8)
FmtFprintfInt             119ns ± 0%     117ns ± 0%  -1.68%  (p=0.000 n=10+9)
GobDecode                12.8ms ± 2%    12.6ms ± 1%  -1.62%  (p=0.002 n=10+10)
JSONDecode               94.4ms ± 1%    93.4ms ± 0%  -1.10%  (p=0.000 n=10+10)
RegexpMatchEasy0_32       247ns ± 0%     245ns ± 0%  -0.65%  (p=0.000 n=10+10)
RegexpMatchMedium_32      314ns ± 0%     312ns ± 0%  -0.64%  (p=0.000 n=10+10)
RegexpMatchEasy0_1K       541ns ± 0%     538ns ± 0%  -0.55%  (p=0.000 n=10+9)
TimeParse                 450ns ± 1%     448ns ± 1%  -0.42%  (p=0.035 n=9+9)
RegexpMatchEasy1_32       244ns ± 0%     243ns ± 0%  -0.41%  (p=0.000 n=10+10)
GoParse                  6.03ms ± 0%    6.00ms ± 0%  -0.40%  (p=0.002 n=10+10)
RegexpMatchEasy1_1K       779ns ± 0%     777ns ± 0%  -0.26%  (p=0.000 n=10+10)
RegexpMatchHard_32       2.75µs ± 0%    2.74µs ± 1%  -0.06%  (p=0.026 n=9+9)
BinaryTree17              11.7s ± 0%     11.6s ± 0%    ~     (p=0.089 n=10+10)
HTTPClientServer         89.1µs ± 1%    89.5µs ± 2%    ~     (p=0.436 n=10+10)
RegexpMatchHard_1K       78.9µs ± 0%    79.5µs ± 2%    ~     (p=0.469 n=10+10)
FmtFprintfEmpty          58.5ns ± 0%    58.5ns ± 0%    ~     (all equal)
GobEncode                12.0ms ± 1%    12.1ms ± 0%    ~     (p=0.075 n=10+10)
Revcomp                   669ms ± 0%     668ms ± 0%    ~     (p=0.091 n=7+9)
Mandelbrot200            5.35ms ± 0%    5.36ms ± 0%  +0.07%  (p=0.000 n=9+9)
RegexpMatchMedium_1K     52.1µs ± 0%    52.1µs ± 0%  +0.10%  (p=0.000 n=9+9)
Fannkuch11                3.25s ± 0%     3.26s ± 0%  +0.36%  (p=0.000 n=9+10)
FmtFprintfString          114ns ± 1%     115ns ± 0%  +0.52%  (p=0.011 n=10+10)
JSONEncode               20.2ms ± 0%    20.3ms ± 0%  +0.65%  (p=0.000 n=10+10)
Template                 91.3ms ± 0%    92.3ms ± 0%  +1.08%  (p=0.000 n=10+10)
TimeFormat                484ns ± 0%     495ns ± 1%  +2.30%  (p=0.000 n=9+10)

There are some opportunities to improve this change further by adding
patterns to match the "extended register" versions of ADD/SUB/CMP, but I
think that should be evaluated on its own.  The regressions in Template
and TimeFormat would likely be recovered by this, as they seem to be due
to generating:

    ubfiz x0, x0, #3, #8
    add x1, x2, x0

instead of

    add x1, x2, x0, lsl #3

Change-Id: I5644a8d70ac7a98e784a377a2b76ab47a3415a4b
Reviewed-on: https://go-review.googlesource.com/88355
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-03-15 14:10:41 +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]+, [$]12",-"LSL",-"AND"
return (x & 0xfff) << 3
}
func ubfiz2(x uint64) uint64 {
// arm64:"UBFIZ\t[$]4, R[0-9]+, [$]12",-"LSL",-"AND"
return (x << 4) & 0xfff0
}
func ubfiz3(x uint32) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]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]+, [$]60",-"LSL",-"LSR"
return (x << 4) >> 3
}
func ubfiz7(x uint32) uint32 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"LSR"
return (x << 4) >> 3
}
func ubfiz8(x uint64) uint64 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]20",-"LSL",-"LSR"
return ((x & 0xfffff) << 4) >> 3
}
func ubfiz9(x uint64) uint64 {
// arm64:"UBFIZ\t[$]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]+, [$]12",-"LSL",-"LSR",-"AND"
return ((x << 5) & (0xfff << 5)) << 2
}
// ubfx
func ubfx1(x uint64) uint64 {
// arm64:"UBFX\t[$]25, R[0-9]+, [$]10",-"LSR",-"AND"
return (x >> 25) & 1023
}
func ubfx2(x uint64) uint64 {
// arm64:"UBFX\t[$]4, R[0-9]+, [$]8",-"LSR",-"AND"
return (x & 0x0ff0) >> 4
}
func ubfx3(x uint32) uint64 {
return uint64(x >> 15) // arm64:"UBFX\t[$]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]+, [$]5",-"LSR"
}
func ubfx6(x uint64) uint64 {
return (x << 1) >> 2 // arm64:"UBFX\t[$]1, R[0-9]+, [$]62",-"LSL",-"LSR"
}
func ubfx7(x uint32) uint32 {
return (x << 1) >> 2 // arm64:"UBFX\t[$]1, R[0-9]+, [$]30",-"LSL",-"LSR"
}
func ubfx8(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
return ((x << 1) >> 2) & 0xfff
}
func ubfx9(x uint64) uint64 {
// arm64:"UBFX\t[$]4, R[0-9]+, [$]11",-"LSL",-"LSR",-"AND"
return ((x >> 3) & 0xfff) >> 1
}
func ubfx10(x uint64) uint64 {
// arm64:"UBFX\t[$]5, R[0-9]+, [$]56",-"LSL",-"LSR"
return ((x >> 2) << 5) >> 8
}
func ubfx11(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]19",-"LSL",-"LSR"
return ((x & 0xfffff) << 3) >> 4
}
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