vector: generate acc_amd64.s from a template.
There are currently 2 instantiations: fixed and floating math. There will eventually be 6: 2 math types times 3 operators (OpOver, OpSrc and Mask). Change-Id: I16db8f3693abe30027ea2f822909980403a6142f Reviewed-on: https://go-review.googlesource.com/30735 Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Nigel Tao
parent
746988e7a2
commit
ae7296db94
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@ -1,6 +1,4 @@
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// generated by go run gen.go; DO NOT EDIT
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// +build !appengine
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// +build gc
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@ -12,8 +10,8 @@
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DATA flAlmost256<>+0x00(SB)/8, $0x437fffff437fffff
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DATA flAlmost256<>+0x08(SB)/8, $0x437fffff437fffff
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DATA flOnes<>+0x00(SB)/8, $0x3f8000003f800000
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DATA flOnes<>+0x08(SB)/8, $0x3f8000003f800000
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DATA flOne<>+0x00(SB)/8, $0x3f8000003f800000
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DATA flOne<>+0x08(SB)/8, $0x3f8000003f800000
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DATA flSignMask<>+0x00(SB)/8, $0x7fffffff7fffffff
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DATA flSignMask<>+0x08(SB)/8, $0x7fffffff7fffffff
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DATA shuffleMask<>+0x00(SB)/8, $0x0c0804000c080400
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@ -22,7 +20,7 @@ DATA fxAlmost256<>+0x00(SB)/8, $0x000000ff000000ff
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DATA fxAlmost256<>+0x08(SB)/8, $0x000000ff000000ff
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GLOBL flAlmost256<>(SB), (NOPTR+RODATA), $16
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GLOBL flOnes<>(SB), (NOPTR+RODATA), $16
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GLOBL flOne<>(SB), (NOPTR+RODATA), $16
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GLOBL flSignMask<>(SB), (NOPTR+RODATA), $16
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GLOBL shuffleMask<>(SB), (NOPTR+RODATA), $16
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GLOBL fxAlmost256<>(SB), (NOPTR+RODATA), $16
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@ -67,9 +65,10 @@ TEXT ·fixedAccumulateOpSrcSIMD(SB), NOSPLIT, $0-48
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ANDQ $-4, CX
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// fxAlmost256 := XMM(0x000000ff repeated four times) // Maximum of an uint8.
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MOVOU fxAlmost256<>(SB), X5
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// shuffleMask := XMM(0x0c080400 repeated four times) // PSHUFB shuffle mask.
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// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
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MOVOU fxAlmost256<>(SB), X5
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MOVOU shuffleMask<>(SB), X6
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XORPS X7, X7
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@ -117,7 +116,10 @@ fxAccOpSrcLoop4:
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BYTE $0x66; BYTE $0x0f; BYTE $0x72; BYTE $0xd2; BYTE $0x0c
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BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x3b; BYTE $0xd5
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// z = shuffleTheLowBytesOfEach4ByteElement(y)
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// z = convertToInt32(y)
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// No-op.
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// z = shuffleTheLowBytesOfEach4ByteElement(z)
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// copy(dst[:4], low4BytesOf(z))
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PSHUFB X6, X2
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MOVL X2, (DI)
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@ -137,7 +139,7 @@ fxAccOpSrcLoop4:
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fxAccOpSrcLoop1:
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// for i < len(src)
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CMPQ AX, DX
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JAE fxAccOpSrcEnd
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JAE fxAccOpSrcCleanup
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// x = src[i] + offset
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MOVL (SI), X1
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@ -158,7 +160,10 @@ fxAccOpSrcLoop1:
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BYTE $0x66; BYTE $0x0f; BYTE $0x72; BYTE $0xd2; BYTE $0x0c
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BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x3b; BYTE $0xd5
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// dst[0] = uint8(y)
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// z = convertToInt32(y)
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// No-op.
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// dst[0] = uint8(z)
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MOVL X2, BX
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MOVB BX, (DI)
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@ -173,6 +178,9 @@ fxAccOpSrcLoop1:
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ADDQ $4, SI
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JMP fxAccOpSrcLoop1
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fxAccOpSrcCleanup:
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// No-op.
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fxAccOpSrcEnd:
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RET
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@ -187,7 +195,7 @@ fxAccOpSrcEnd:
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// xmm1 x
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// xmm2 y, z
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// xmm3 flAlmost256
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// xmm4 flOnes
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// xmm4 flOne
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// xmm5 flSignMask
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// xmm6 shuffleMask
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// xmm7 offset
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@ -214,13 +222,14 @@ TEXT ·floatingAccumulateOpSrcSIMD(SB), NOSPLIT, $8-48
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LDMXCSR mxcsrNew-4(SP)
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// flAlmost256 := XMM(0x437fffff repeated four times) // 255.99998 as a float32.
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// flOnes := XMM(0x3f800000 repeated four times) // 1 as a float32.
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// flOne := XMM(0x3f800000 repeated four times) // 1 as a float32.
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// flSignMask := XMM(0x7fffffff repeated four times) // All but the sign bit of a float32.
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MOVOU flAlmost256<>(SB), X3
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MOVOU flOne<>(SB), X4
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MOVOU flSignMask<>(SB), X5
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// shuffleMask := XMM(0x0c080400 repeated four times) // PSHUFB shuffle mask.
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// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
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MOVOU flAlmost256<>(SB), X3
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MOVOU flOnes<>(SB), X4
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MOVOU flSignMask<>(SB), X5
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MOVOU shuffleMask<>(SB), X6
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XORPS X7, X7
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@ -254,19 +263,20 @@ flAccOpSrcLoop4:
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ADDPS X7, X1
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// y = x & flSignMask
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// y = min(y, flOnes)
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// y = min(y, flOne)
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// y = mul(y, flAlmost256)
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MOVOU X5, X2
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ANDPS X1, X2
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MINPS X4, X2
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MULPS X3, X2
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// z = float32ToInt32(y)
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// z = convertToInt32(y)
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CVTPS2PL X2, X2
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// z = shuffleTheLowBytesOfEach4ByteElement(z)
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// copy(dst[:4], low4BytesOf(z))
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CVTPS2PL X2, X2
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PSHUFB X6, X2
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MOVL X2, (DI)
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PSHUFB X6, X2
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MOVL X2, (DI)
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// offset = XMM(x@3, x@3, x@3, x@3)
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MOVOU X1, X7
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@ -283,25 +293,26 @@ flAccOpSrcLoop4:
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flAccOpSrcLoop1:
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// for i < len(src)
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CMPQ AX, DX
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JAE flAccOpSrcRestoreMXCSR
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JAE flAccOpSrcCleanup
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// x = src[i] + offset
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MOVL (SI), X1
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ADDPS X7, X1
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// y = x & flSignMask
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// y = min(y, flOnes)
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// y = min(y, flOne)
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// y = mul(y, flAlmost256)
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MOVOU X5, X2
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ANDPS X1, X2
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MINPS X4, X2
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MULPS X3, X2
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// z = float32ToInt32(y)
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// dst[0] = uint8(z)
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// z = convertToInt32(y)
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CVTPS2PL X2, X2
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MOVL X2, BX
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MOVB BX, (DI)
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// dst[0] = uint8(z)
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MOVL X2, BX
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MOVB BX, (DI)
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// offset = x
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MOVOU X1, X7
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@ -314,7 +325,7 @@ flAccOpSrcLoop1:
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ADDQ $4, SI
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JMP flAccOpSrcLoop1
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flAccOpSrcRestoreMXCSR:
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flAccOpSrcCleanup:
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LDMXCSR mxcsrOrig-8(SP)
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flAccOpSrcEnd:
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178
vector/gen.go
Normal file
178
vector/gen.go
Normal file
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@ -0,0 +1,178 @@
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package main
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import (
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"bytes"
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"io/ioutil"
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"log"
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"text/template"
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)
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const (
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copyright = "" +
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"// Copyright 2016 The Go Authors. All rights reserved.\n" +
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"// Use of this source code is governed by a BSD-style\n" +
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"// license that can be found in the LICENSE file.\n"
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doNotEdit = "// generated by go run gen.go; DO NOT EDIT\n"
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dashDashDash = "// --------"
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)
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func main() {
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tmpl, err := ioutil.ReadFile("gen_acc_amd64.s.tmpl")
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if err != nil {
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log.Fatalf("ReadFile: %v", err)
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}
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if !bytes.HasPrefix(tmpl, []byte(copyright)) {
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log.Fatal("source template did not start with the copyright header")
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}
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tmpl = tmpl[len(copyright):]
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preamble := []byte(nil)
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if i := bytes.Index(tmpl, []byte(dashDashDash)); i < 0 {
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log.Fatalf("source template did not contain %q", dashDashDash)
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} else {
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preamble, tmpl = tmpl[:i], tmpl[i:]
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}
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t, err := template.New("").Parse(string(tmpl))
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if err != nil {
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log.Fatalf("Parse: %v", err)
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}
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out := bytes.NewBuffer(nil)
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out.WriteString(doNotEdit)
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out.Write(preamble)
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for i, v := range instances {
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if i != 0 {
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out.WriteString("\n")
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}
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if err := t.Execute(out, v); err != nil {
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log.Fatalf("Execute(%q): %v", v.ShortName, err)
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}
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}
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if err := ioutil.WriteFile("acc_amd64.s", out.Bytes(), 0666); err != nil {
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log.Fatalf("WriteFile: %v", err)
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}
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}
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var instances = []struct {
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LongName string
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ShortName string
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FrameSize string
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SrcType string
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XMM3 string
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XMM4 string
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XMM5 string
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Setup string
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Cleanup string
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Add string
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ClampAndScale string
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ConvertToInt32 string
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}{{
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LongName: "fixedAccumulateOpSrc",
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ShortName: "fxAccOpSrc",
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FrameSize: fxFrameSize,
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SrcType: fxSrcType,
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XMM3: fxXMM3,
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XMM4: fxXMM4,
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XMM5: fxXMM5,
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Setup: fxSetup,
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Cleanup: fxCleanup,
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Add: fxAdd,
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ClampAndScale: fxClampAndScale,
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ConvertToInt32: fxConvertToInt32,
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}, {
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LongName: "floatingAccumulateOpSrc",
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ShortName: "flAccOpSrc",
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FrameSize: flFrameSize,
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SrcType: flSrcType,
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XMM3: flXMM3,
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XMM4: flXMM4,
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XMM5: flXMM5,
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Setup: flSetup,
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Cleanup: flCleanup,
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Add: flAdd,
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ClampAndScale: flClampAndScale,
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ConvertToInt32: flConvertToInt32,
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}}
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const (
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fxFrameSize = `0`
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flFrameSize = `8`
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fxSrcType = `[]uint32`
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flSrcType = `[]float32`
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fxXMM3 = `-`
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flXMM3 = `flAlmost256`
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fxXMM4 = `-`
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flXMM4 = `flOne`
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fxXMM5 = `fxAlmost256`
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flXMM5 = `flSignMask`
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fxSetup = `
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// fxAlmost256 := XMM(0x000000ff repeated four times) // Maximum of an uint8.
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MOVOU fxAlmost256<>(SB), X5
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`
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flSetup = `
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// Set MXCSR bits 13 and 14, so that the CVTPS2PL below is "Round To Zero".
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STMXCSR mxcsrOrig-8(SP)
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MOVL mxcsrOrig-8(SP), AX
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ORL $0x6000, AX
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MOVL AX, mxcsrNew-4(SP)
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LDMXCSR mxcsrNew-4(SP)
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// flAlmost256 := XMM(0x437fffff repeated four times) // 255.99998 as a float32.
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// flOne := XMM(0x3f800000 repeated four times) // 1 as a float32.
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// flSignMask := XMM(0x7fffffff repeated four times) // All but the sign bit of a float32.
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MOVOU flAlmost256<>(SB), X3
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MOVOU flOne<>(SB), X4
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MOVOU flSignMask<>(SB), X5
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`
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fxCleanup = `// No-op.`
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flCleanup = `LDMXCSR mxcsrOrig-8(SP)`
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fxAdd = `PADDD`
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flAdd = `ADDPS`
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fxClampAndScale = `
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// y = abs(x)
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// y >>= 12 // Shift by 2*ϕ - 8.
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// y = min(y, fxAlmost256)
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//
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// pabsd %xmm1,%xmm2
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// psrld $0xc,%xmm2
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// pminud %xmm5,%xmm2
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//
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// Hopefully we'll get these opcode mnemonics into the assembler for Go
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// 1.8. https://golang.org/issue/16007 isn't exactly the same thing, but
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// it's similar.
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BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x1e; BYTE $0xd1
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BYTE $0x66; BYTE $0x0f; BYTE $0x72; BYTE $0xd2; BYTE $0x0c
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BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x3b; BYTE $0xd5
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`
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flClampAndScale = `
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// y = x & flSignMask
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// y = min(y, flOne)
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// y = mul(y, flAlmost256)
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MOVOU X5, X2
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ANDPS X1, X2
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MINPS X4, X2
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MULPS X3, X2
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`
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fxConvertToInt32 = `// No-op.`
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flConvertToInt32 = `CVTPS2PL X2, X2`
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)
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160
vector/gen_acc_amd64.s.tmpl
Normal file
160
vector/gen_acc_amd64.s.tmpl
Normal file
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@ -0,0 +1,160 @@
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build !appengine
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// +build gc
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// +build !noasm
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#include "textflag.h"
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// fl is short for floating point math. fx is short for fixed point math.
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DATA flAlmost256<>+0x00(SB)/8, $0x437fffff437fffff
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DATA flAlmost256<>+0x08(SB)/8, $0x437fffff437fffff
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DATA flOne<>+0x00(SB)/8, $0x3f8000003f800000
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DATA flOne<>+0x08(SB)/8, $0x3f8000003f800000
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DATA flSignMask<>+0x00(SB)/8, $0x7fffffff7fffffff
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DATA flSignMask<>+0x08(SB)/8, $0x7fffffff7fffffff
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DATA shuffleMask<>+0x00(SB)/8, $0x0c0804000c080400
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DATA shuffleMask<>+0x08(SB)/8, $0x0c0804000c080400
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DATA fxAlmost256<>+0x00(SB)/8, $0x000000ff000000ff
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DATA fxAlmost256<>+0x08(SB)/8, $0x000000ff000000ff
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GLOBL flAlmost256<>(SB), (NOPTR+RODATA), $16
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GLOBL flOne<>(SB), (NOPTR+RODATA), $16
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GLOBL flSignMask<>(SB), (NOPTR+RODATA), $16
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GLOBL shuffleMask<>(SB), (NOPTR+RODATA), $16
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GLOBL fxAlmost256<>(SB), (NOPTR+RODATA), $16
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// func haveSSE4_1() bool
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TEXT ·haveSSE4_1(SB), NOSPLIT, $0
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MOVQ $1, AX
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CPUID
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SHRQ $19, CX
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ANDQ $1, CX
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MOVB CX, ret+0(FP)
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RET
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// ----------------------------------------------------------------------------
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// func {{.LongName}}SIMD(dst []uint8, src {{.SrcType}})
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//
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// XMM registers. Variable names are per
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// https://github.com/google/font-rs/blob/master/src/accumulate.c
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//
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// xmm0 scratch
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// xmm1 x
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// xmm2 y, z
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// xmm3 {{.XMM3}}
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// xmm4 {{.XMM4}}
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// xmm5 {{.XMM5}}
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// xmm6 shuffleMask
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// xmm7 offset
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TEXT ·{{.LongName}}SIMD(SB), NOSPLIT, ${{.FrameSize}}-48
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MOVQ dst_base+0(FP), DI
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MOVQ dst_len+8(FP), BX
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MOVQ src_base+24(FP), SI
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MOVQ src_len+32(FP), CX
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// Sanity check that len(dst) >= len(src).
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CMPQ BX, CX
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JLT {{.ShortName}}End
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// CX = len(src) &^ 3
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// DX = len(src)
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MOVQ CX, DX
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ANDQ $-4, CX
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{{.Setup}}
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// shuffleMask := XMM(0x0c080400 repeated four times) // PSHUFB shuffle mask.
|
||||
// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
|
||||
MOVOU shuffleMask<>(SB), X6
|
||||
XORPS X7, X7
|
||||
|
||||
// i := 0
|
||||
MOVQ $0, AX
|
||||
|
||||
{{.ShortName}}Loop4:
|
||||
// for i < (len(src) &^ 3)
|
||||
CMPQ AX, CX
|
||||
JAE {{.ShortName}}Loop1
|
||||
|
||||
// x = XMM(s0, s1, s2, s3)
|
||||
//
|
||||
// Where s0 is src[i+0], s1 is src[i+1], etc.
|
||||
MOVOU (SI), X1
|
||||
|
||||
// scratch = XMM(0, s0, s1, s2)
|
||||
// x += scratch // yields x == XMM(s0, s0+s1, s1+s2, s2+s3)
|
||||
MOVOU X1, X0
|
||||
PSLLO $4, X0
|
||||
{{.Add}} X0, X1
|
||||
|
||||
// scratch = XMM(0, 0, 0, 0)
|
||||
// scratch = XMM(scratch@0, scratch@0, x@0, x@1) // yields scratch == XMM(0, 0, s0, s0+s1)
|
||||
// x += scratch // yields x == XMM(s0, s0+s1, s0+s1+s2, s0+s1+s2+s3)
|
||||
XORPS X0, X0
|
||||
SHUFPS $0x40, X1, X0
|
||||
{{.Add}} X0, X1
|
||||
|
||||
// x += offset
|
||||
{{.Add}} X7, X1
|
||||
|
||||
{{.ClampAndScale}}
|
||||
|
||||
// z = convertToInt32(y)
|
||||
{{.ConvertToInt32}}
|
||||
|
||||
// z = shuffleTheLowBytesOfEach4ByteElement(z)
|
||||
// copy(dst[:4], low4BytesOf(z))
|
||||
PSHUFB X6, X2
|
||||
MOVL X2, (DI)
|
||||
|
||||
// offset = XMM(x@3, x@3, x@3, x@3)
|
||||
MOVOU X1, X7
|
||||
SHUFPS $0xff, X1, X7
|
||||
|
||||
// i += 4
|
||||
// dst = dst[4:]
|
||||
// src = src[4:]
|
||||
ADDQ $4, AX
|
||||
ADDQ $4, DI
|
||||
ADDQ $16, SI
|
||||
JMP {{.ShortName}}Loop4
|
||||
|
||||
{{.ShortName}}Loop1:
|
||||
// for i < len(src)
|
||||
CMPQ AX, DX
|
||||
JAE {{.ShortName}}Cleanup
|
||||
|
||||
// x = src[i] + offset
|
||||
MOVL (SI), X1
|
||||
{{.Add}} X7, X1
|
||||
|
||||
{{.ClampAndScale}}
|
||||
|
||||
// z = convertToInt32(y)
|
||||
{{.ConvertToInt32}}
|
||||
|
||||
// dst[0] = uint8(z)
|
||||
MOVL X2, BX
|
||||
MOVB BX, (DI)
|
||||
|
||||
// offset = x
|
||||
MOVOU X1, X7
|
||||
|
||||
// i += 1
|
||||
// dst = dst[1:]
|
||||
// src = src[1:]
|
||||
ADDQ $1, AX
|
||||
ADDQ $1, DI
|
||||
ADDQ $4, SI
|
||||
JMP {{.ShortName}}Loop1
|
||||
|
||||
{{.ShortName}}Cleanup:
|
||||
{{.Cleanup}}
|
||||
|
||||
{{.ShortName}}End:
|
||||
RET
|
||||
|
|
@ -2,6 +2,11 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
//go:generate go run gen.go
|
||||
//go:generate asmfmt -w acc_amd64.s
|
||||
|
||||
// asmfmt is https://github.com/klauspost/asmfmt
|
||||
|
||||
// Package vector provides a rasterizer for 2-D vector graphics.
|
||||
package vector // import "golang.org/x/image/vector"
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user