зеркало из https://github.com/golang/image.git
172 строки
4.0 KiB
Cheetah
172 строки
4.0 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 go1.6
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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 flAlmost65536<>+0x00(SB)/8, $0x477fffff477fffff
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DATA flAlmost65536<>+0x08(SB)/8, $0x477fffff477fffff
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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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// scatterAndMulBy0x101 is a PSHUFB mask that brings the low four bytes of an
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// XMM register to the low byte of that register's four uint32 values. It
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// duplicates those bytes, effectively multiplying each uint32 by 0x101.
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//
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// It transforms a little-endian 16-byte XMM value from
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// ijkl????????????
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// to
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// ii00jj00kk00ll00
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DATA scatterAndMulBy0x101<>+0x00(SB)/8, $0x8080010180800000
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DATA scatterAndMulBy0x101<>+0x08(SB)/8, $0x8080030380800202
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// gather is a PSHUFB mask that brings the second-lowest byte of the XMM
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// register's four uint32 values to the low four bytes of that register.
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//
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// It transforms a little-endian 16-byte XMM value from
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// ?i???j???k???l??
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// to
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// ijkl000000000000
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DATA gather<>+0x00(SB)/8, $0x808080800d090501
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DATA gather<>+0x08(SB)/8, $0x8080808080808080
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DATA fxAlmost65536<>+0x00(SB)/8, $0x0000ffff0000ffff
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DATA fxAlmost65536<>+0x08(SB)/8, $0x0000ffff0000ffff
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DATA inverseFFFF<>+0x00(SB)/8, $0x8000800180008001
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DATA inverseFFFF<>+0x08(SB)/8, $0x8000800180008001
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GLOBL flAlmost65536<>(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 scatterAndMulBy0x101<>(SB), (NOPTR+RODATA), $16
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GLOBL gather<>(SB), (NOPTR+RODATA), $16
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GLOBL fxAlmost65536<>(SB), (NOPTR+RODATA), $16
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GLOBL inverseFFFF<>(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({{.Args}})
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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 {{.XMM6}}
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// xmm7 offset
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// xmm8 {{.XMM8}}
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// xmm9 {{.XMM9}}
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// xmm10 {{.XMM10}}
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TEXT ·{{.LongName}}SIMD(SB), NOSPLIT, ${{.FrameSize}}-{{.ArgsSize}}
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{{.LoadArgs}}
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// R10 = len(src) &^ 3
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// R11 = len(src)
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MOVQ R10, R11
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ANDQ $-4, R10
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{{.Setup}}
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{{.LoadXMMRegs}}
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// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
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XORPS X7, X7
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// i := 0
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MOVQ $0, R9
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{{.ShortName}}Loop4:
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// for i < (len(src) &^ 3)
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CMPQ R9, R10
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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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{{.ConvertToInt32}}
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{{.Store4}}
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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, R9
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ADDQ ${{.DstElemSize4}}, 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 R9, R11
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JAE {{.ShortName}}End
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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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{{.ConvertToInt32}}
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{{.Store1}}
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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, R9
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ADDQ ${{.DstElemSize1}}, DI
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ADDQ $4, SI
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JMP {{.ShortName}}Loop1
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{{.ShortName}}End:
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RET
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