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cmd/compile: wire up Bswap/ReverseBytes intrinsics for loong64

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Micro-benchmark results on Loongson 3A5000 and 3A6000:

goos: linux
goarch: loong64
pkg: math/bits
cpu: Loongson-3A6000 @ 2500.00MHz
               |  bench.old   |              bench.new               |
               |    sec/op    |    sec/op     vs base                |
ReverseBytes     2.0020n ± 0%   0.4040n ± 0%  -79.82% (p=0.000 n=20)
ReverseBytes16   0.8866n ± 1%   0.8007n ± 0%   -9.69% (p=0.000 n=20)
ReverseBytes32   1.2195n ± 0%   0.8007n ± 0%  -34.34% (p=0.000 n=20)
ReverseBytes64   2.0705n ± 0%   0.8008n ± 0%  -61.32% (p=0.000 n=20)
geomean           1.455n        0.6749n       -53.62%

goos: linux
goarch: loong64
pkg: math/bits
cpu: Loongson-3A5000 @ 2500.00MHz
               |  bench.old   |              bench.new               |
               |    sec/op    |    sec/op     vs base                |
ReverseBytes     2.8040n ± 0%   0.5205n ± 0%  -81.44% (p=0.000 n=20)
ReverseBytes16   0.7066n ± 0%   0.8011n ± 0%  +13.37% (p=0.000 n=20)
ReverseBytes32   1.5500n ± 0%   0.8010n ± 0%  -48.32% (p=0.000 n=20)
ReverseBytes64   2.7665n ± 0%   0.8010n ± 0%  -71.05% (p=0.000 n=20)
geomean           1.707n        0.7192n       -57.87%

Updates #59120

This patch is a copy of CL 483357.
Co-authored-by: WANG Xuerui <git@xen0n.name>

Change-Id: If355354cd031533df91991fcc3392e5a6c314295
Reviewed-on: https://go-review.googlesource.com/c/go/+/624576
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
This commit is contained in:
Xiaolin Zhao 2024-11-02 14:30:31 +08:00 committed by abner chenc
parent d98c51809d
commit d6fb0ab2c7
8 changed files with 74 additions and 1 deletions
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3
src/cmd/compile/internal/loong64/ssa.go
View File

@ -487,6 +487,9 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
ssa.OpLOONG64CLZV,
ssa.OpLOONG64SQRTD,
ssa.OpLOONG64SQRTF,
ssa.OpLOONG64REVB2H,
ssa.OpLOONG64REVB2W,
ssa.OpLOONG64REVBV,
ssa.OpLOONG64ABSD:
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG

1
src/cmd/compile/internal/ssa/_gen/LOONG64.rules
View File

@ -147,6 +147,7 @@
(BitLen64 <t> x) => (NEGV <t> (SUBVconst <t> [64] (CLZV <t> x)))
(BitLen32 <t> x) => (NEGV <t> (SUBVconst <t> [32] (CLZW <t> x)))
(Bswap(16|32|64) ...) => (REVB(2H|2W|V) ...)
// math package intrinsics
(Sqrt ...) => (SQRTD ...)

4
src/cmd/compile/internal/ssa/_gen/LOONG64Ops.go
View File

@ -202,6 +202,10 @@ func init() {
{name: "CLZW", argLength: 1, reg: gp11, asm: "CLZW"}, // Count leading (high order) zeroes (returns 0-32)
{name: "CLZV", argLength: 1, reg: gp11, asm: "CLZV"}, // Count leading (high order) zeroes (returns 0-64)
{name: "REVB2H", argLength: 1, reg: gp11, asm: "REVB2H"}, // Swap bytes: 0x11223344 -> 0x22114433 (sign extends to 64 bits)
{name: "REVB2W", argLength: 1, reg: gp11, asm: "REVB2W"}, // Swap bytes: 0x1122334455667788 -> 0x4433221188776655
{name: "REVBV", argLength: 1, reg: gp11, asm: "REVBV"}, // Swap bytes: 0x1122334455667788 -> 0x8877665544332211
{name: "FMINF", argLength: 2, reg: fp21, resultNotInArgs: true, asm: "FMINF", commutative: true, typ: "Float32"}, // min(arg0, arg1), float32
{name: "FMIND", argLength: 2, reg: fp21, resultNotInArgs: true, asm: "FMIND", commutative: true, typ: "Float64"}, // min(arg0, arg1), float64
{name: "FMAXF", argLength: 2, reg: fp21, resultNotInArgs: true, asm: "FMAXF", commutative: true, typ: "Float32"}, // max(arg0, arg1), float32

42
src/cmd/compile/internal/ssa/opGen.go
View File

@ -1790,6 +1790,9 @@ const (
OpLOONG64SQRTF
OpLOONG64CLZW
OpLOONG64CLZV
OpLOONG64REVB2H
OpLOONG64REVB2W
OpLOONG64REVBV
OpLOONG64FMINF
OpLOONG64FMIND
OpLOONG64FMAXF
@ -24012,6 +24015,45 @@ var opcodeTable = [...]opInfo{
},
},
},
{
name: "REVB2H",
argLen: 1,
asm: loong64.AREVB2H,
reg: regInfo{
inputs: []inputInfo{
{0, 1073741816}, // R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 g R23 R24 R25 R26 R27 R28 R29 R31
},
outputs: []outputInfo{
{0, 1071644664}, // R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R23 R24 R25 R26 R27 R28 R29 R31
},
},
},
{
name: "REVB2W",
argLen: 1,
asm: loong64.AREVB2W,
reg: regInfo{
inputs: []inputInfo{
{0, 1073741816}, // R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 g R23 R24 R25 R26 R27 R28 R29 R31
},
outputs: []outputInfo{
{0, 1071644664}, // R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R23 R24 R25 R26 R27 R28 R29 R31
},
},
},
{
name: "REVBV",
argLen: 1,
asm: loong64.AREVBV,
reg: regInfo{
inputs: []inputInfo{
{0, 1073741816}, // R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 g R23 R24 R25 R26 R27 R28 R29 R31
},
outputs: []outputInfo{
{0, 1071644664}, // R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R23 R24 R25 R26 R27 R28 R29 R31
},
},
},
{
name: "FMINF",
argLen: 2,

9
src/cmd/compile/internal/ssa/rewriteLOONG64.go
View File

@ -94,6 +94,15 @@ func rewriteValueLOONG64(v *Value) bool {
return rewriteValueLOONG64_OpBitLen32(v)
case OpBitLen64:
return rewriteValueLOONG64_OpBitLen64(v)
case OpBswap16:
v.Op = OpLOONG64REVB2H
return true
case OpBswap32:
v.Op = OpLOONG64REVB2W
return true
case OpBswap64:
v.Op = OpLOONG64REVBV
return true
case OpClosureCall:
v.Op = OpLOONG64CALLclosure
return true

7
src/cmd/compile/internal/ssagen/intrinsics.go
View File

@ -183,7 +183,7 @@ func initIntrinsics(cfg *intrinsicBuildConfig) {
},
all...)
brev_arch := []sys.ArchFamily{sys.AMD64, sys.I386, sys.ARM64, sys.ARM, sys.S390X}
brev_arch := []sys.ArchFamily{sys.AMD64, sys.I386, sys.ARM64, sys.ARM, sys.Loong64, sys.S390X}
if cfg.goppc64 >= 10 {
// Use only on Power10 as the new byte reverse instructions that Power10 provide
// make it worthwhile as an intrinsic
@ -804,6 +804,11 @@ func initIntrinsics(cfg *intrinsicBuildConfig) {
sys.S390X)
alias("math/bits", "ReverseBytes64", "internal/runtime/sys", "Bswap64", all...)
alias("math/bits", "ReverseBytes32", "internal/runtime/sys", "Bswap32", all...)
addF("math/bits", "ReverseBytes16",
func(s *state, n *ir.CallExpr, args []*ssa.Value) *ssa.Value {
return s.newValue1(ssa.OpBswap16, types.Types[types.TUINT16], args[0])
},
sys.Loong64)
// ReverseBytes inlines correctly, no need to intrinsify it.
// Nothing special is needed for targets where ReverseBytes16 lowers to a rotate
// On Power10, 16-bit rotate is not available so use BRH instruction

5
src/cmd/compile/internal/ssagen/intrinsics_test.go
View File

@ -390,6 +390,8 @@ var wantIntrinsics = map[testIntrinsicKey]struct{}{
{"loong64", "internal/runtime/math", "Add64"}: struct{}{},
{"loong64", "internal/runtime/math", "Mul64"}: struct{}{},
{"loong64", "internal/runtime/math", "MulUintptr"}: struct{}{},
{"loong64", "internal/runtime/sys", "Bswap32"}: struct{}{},
{"loong64", "internal/runtime/sys", "Bswap64"}: struct{}{},
{"loong64", "internal/runtime/sys", "GetCallerPC"}: struct{}{},
{"loong64", "internal/runtime/sys", "GetCallerSP"}: struct{}{},
{"loong64", "internal/runtime/sys", "GetClosurePtr"}: struct{}{},
@ -411,6 +413,9 @@ var wantIntrinsics = map[testIntrinsicKey]struct{}{
{"loong64", "math/bits", "RotateLeft"}: struct{}{},
{"loong64", "math/bits", "RotateLeft32"}: struct{}{},
{"loong64", "math/bits", "RotateLeft64"}: struct{}{},
{"loong64", "math/bits", "ReverseBytes16"}: struct{}{},
{"loong64", "math/bits", "ReverseBytes32"}: struct{}{},
{"loong64", "math/bits", "ReverseBytes64"}: struct{}{},
{"loong64", "math/bits", "Sub"}: struct{}{},
{"loong64", "math/bits", "Sub64"}: struct{}{},
{"loong64", "runtime", "KeepAlive"}: struct{}{},

4
test/codegen/mathbits.go
View File

@ -208,6 +208,7 @@ func ReverseBytes(n uint) uint {
// 386:"BSWAPL"
// s390x:"MOVDBR"
// arm64:"REV"
// loong64:"REVBV"
return bits.ReverseBytes(n)
}
@ -217,6 +218,7 @@ func ReverseBytes64(n uint64) uint64 {
// s390x:"MOVDBR"
// arm64:"REV"
// ppc64x/power10: "BRD"
// loong64:"REVBV"
return bits.ReverseBytes64(n)
}
@ -225,6 +227,7 @@ func ReverseBytes32(n uint32) uint32 {
// 386:"BSWAPL"
// s390x:"MOVWBR"
// arm64:"REVW"
// loong64:"REVB2W"
// ppc64x/power10: "BRW"
return bits.ReverseBytes32(n)
}
@ -235,6 +238,7 @@ func ReverseBytes16(n uint16) uint16 {
// arm/5:"SLL","SRL","ORR"
// arm/6:"REV16"
// arm/7:"REV16"
// loong64:"REVB2H"
// ppc64x/power10: "BRH"
return bits.ReverseBytes16(n)
}