ae7296db94
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>
161 lines
3.5 KiB
Cheetah
161 lines
3.5 KiB
Cheetah
// 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.
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// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
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MOVOU shuffleMask<>(SB), X6
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XORPS X7, X7
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// i := 0
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MOVQ $0, AX
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{{.ShortName}}Loop4:
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// for i < (len(src) &^ 3)
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CMPQ AX, CX
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JAE {{.ShortName}}Loop1
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// x = XMM(s0, s1, s2, s3)
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//
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// Where s0 is src[i+0], s1 is src[i+1], etc.
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MOVOU (SI), X1
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// scratch = XMM(0, s0, s1, s2)
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// x += scratch // yields x == XMM(s0, s0+s1, s1+s2, s2+s3)
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MOVOU X1, X0
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PSLLO $4, X0
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{{.Add}} X0, X1
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// scratch = XMM(0, 0, 0, 0)
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// scratch = XMM(scratch@0, scratch@0, x@0, x@1) // yields scratch == XMM(0, 0, s0, s0+s1)
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// x += scratch // yields x == XMM(s0, s0+s1, s0+s1+s2, s0+s1+s2+s3)
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XORPS X0, X0
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SHUFPS $0x40, X1, X0
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{{.Add}} X0, X1
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// x += offset
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{{.Add}} X7, X1
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{{.ClampAndScale}}
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// z = convertToInt32(y)
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{{.ConvertToInt32}}
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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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// offset = XMM(x@3, x@3, x@3, x@3)
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MOVOU X1, X7
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SHUFPS $0xff, X1, X7
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// i += 4
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// dst = dst[4:]
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// src = src[4:]
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ADDQ $4, AX
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ADDQ $4, DI
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ADDQ $16, SI
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JMP {{.ShortName}}Loop4
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{{.ShortName}}Loop1:
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// for i < len(src)
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CMPQ AX, DX
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JAE {{.ShortName}}Cleanup
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// x = src[i] + offset
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MOVL (SI), X1
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{{.Add}} X7, X1
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{{.ClampAndScale}}
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// z = convertToInt32(y)
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{{.ConvertToInt32}}
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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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// i += 1
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// dst = dst[1:]
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// src = src[1:]
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ADDQ $1, AX
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ADDQ $1, DI
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ADDQ $4, SI
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JMP {{.ShortName}}Loop1
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{{.ShortName}}Cleanup:
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{{.Cleanup}}
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{{.ShortName}}End:
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RET
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