93fad3647f
PSHUFB already lets us pick certain bytes out of an XMM register. There's no need to shift by 8 bits (1 byte) beforehand. The code generator is simpler. There's also a small win on the benchmarks, especially for FixedAccumulateOpOverSIMD. name old time/op new time/op delta FixedAccumulateOpOverSIMD16-8 183ns ± 0% 174ns ± 0% -4.92% (p=0.000 n=8+8) FixedAccumulateOpSrcSIMD16-8 87.0ns ± 1% 86.3ns ± 0% -0.77% (p=0.000 n=10+9) FixedAccumulateMaskSIMD16-8 80.4ns ± 1% 81.2ns ± 1% +1.01% (p=0.000 n=10+10) FloatingAccumulateOpOverSIMD16-8 250ns ± 1% 244ns ± 0% -2.39% (p=0.000 n=10+8) FloatingAccumulateOpSrcSIMD16-8 176ns ± 1% 176ns ± 0% ~ (p=0.142 n=10+8) FloatingAccumulateMaskSIMD16-8 167ns ± 0% 167ns ± 0% ~ (p=0.137 n=8+10) FixedAccumulateOpOverSIMD64-8 2.73µs ± 1% 2.58µs ± 0% -5.36% (p=0.000 n=10+7) FixedAccumulateOpSrcSIMD64-8 1.18µs ± 1% 1.17µs ± 0% -0.33% (p=0.003 n=10+9) FixedAccumulateMaskSIMD64-8 1.09µs ± 0% 1.09µs ± 0% -0.17% (p=0.047 n=9+9) FloatingAccumulateOpOverSIMD64-8 3.67µs ± 0% 3.61µs ± 1% -1.47% (p=0.000 n=7+10) FloatingAccumulateOpSrcSIMD64-8 2.60µs ± 0% 2.61µs ± 0% +0.19% (p=0.003 n=8+8) FloatingAccumulateMaskSIMD64-8 2.47µs ± 0% 2.46µs ± 0% ~ (p=0.162 n=10+9) GlyphAlpha16Over-8 2.99µs ± 0% 2.98µs ± 1% -0.50% (p=0.021 n=9+10) GlyphAlpha16Src-8 2.89µs ± 1% 2.89µs ± 0% ~ (p=0.381 n=10+10) GlyphAlpha32Over-8 4.53µs ± 0% 4.50µs ± 0% -0.83% (p=0.000 n=10+10) GlyphAlpha32Src-8 4.14µs ± 0% 4.13µs ± 0% -0.21% (p=0.026 n=9+10) GlyphAlpha64Over-8 8.97µs ± 1% 8.80µs ± 0% -1.85% (p=0.000 n=10+9) GlyphAlpha64Src-8 7.42µs ± 1% 7.39µs ± 0% -0.45% (p=0.011 n=10+10) GlyphAlpha128Over-8 21.8µs ± 0% 21.2µs ± 0% -2.91% (p=0.000 n=9+9) GlyphAlpha128Src-8 15.6µs ± 0% 15.6µs ± 0% ~ (p=0.982 n=10+7) GlyphAlpha256Over-8 66.3µs ± 1% 63.7µs ± 0% -3.84% (p=0.000 n=10+9) GlyphAlpha256Src-8 41.2µs ± 1% 41.2µs ± 1% ~ (p=1.000 n=10+10) GlyphRGBA16Over-8 4.75µs ± 0% 4.75µs ± 1% ~ (p=0.735 n=9+10) GlyphRGBA16Src-8 4.20µs ± 0% 4.20µs ± 0% ~ (p=0.503 n=8+8) GlyphRGBA32Over-8 11.4µs ± 0% 11.4µs ± 0% ~ (p=0.119 n=9+9) GlyphRGBA32Src-8 9.34µs ± 1% 9.32µs ± 0% ~ (p=0.062 n=9+8) GlyphRGBA64Over-8 36.0µs ± 0% 36.1µs ± 0% ~ (p=0.209 n=8+9) GlyphRGBA64Src-8 27.9µs ± 1% 27.8µs ± 0% ~ (p=0.796 n=10+10) GlyphRGBA128Over-8 131µs ± 0% 131µs ± 0% ~ (p=0.931 n=9+9) GlyphRGBA128Src-8 97.9µs ± 0% 97.7µs ± 1% ~ (p=0.053 n=9+10) GlyphRGBA256Over-8 503µs ± 0% 503µs ± 1% ~ (p=0.274 n=8+10) GlyphRGBA256Src-8 370µs ± 0% 369µs ± 0% ~ (p=0.497 n=9+10) Change-Id: I56651e70b258792b83ea2a74904756243c88bef4 Reviewed-on: https://go-review.googlesource.com/31537 Reviewed-by: David Crawshaw <crawshaw@golang.org>
1083 lines
25 KiB
ArmAsm
1083 lines
25 KiB
ArmAsm
// generated by go run gen.go; DO NOT EDIT
|
|
|
|
// +build !appengine
|
|
// +build gc
|
|
// +build !noasm
|
|
|
|
#include "textflag.h"
|
|
|
|
// fl is short for floating point math. fx is short for fixed point math.
|
|
|
|
DATA flAlmost65536<>+0x00(SB)/8, $0x477fffff477fffff
|
|
DATA flAlmost65536<>+0x08(SB)/8, $0x477fffff477fffff
|
|
DATA flOne<>+0x00(SB)/8, $0x3f8000003f800000
|
|
DATA flOne<>+0x08(SB)/8, $0x3f8000003f800000
|
|
DATA flSignMask<>+0x00(SB)/8, $0x7fffffff7fffffff
|
|
DATA flSignMask<>+0x08(SB)/8, $0x7fffffff7fffffff
|
|
|
|
// scatterAndMulBy0x101 is a PSHUFB mask that brings the low four bytes of an
|
|
// XMM register to the low byte of that register's four uint32 values. It
|
|
// duplicates those bytes, effectively multiplying each uint32 by 0x101.
|
|
//
|
|
// It transforms a little-endian 16-byte XMM value from
|
|
// ijkl????????????
|
|
// to
|
|
// ii00jj00kk00ll00
|
|
DATA scatterAndMulBy0x101<>+0x00(SB)/8, $0x8080010180800000
|
|
DATA scatterAndMulBy0x101<>+0x08(SB)/8, $0x8080030380800202
|
|
|
|
// gather is a PSHUFB mask that brings the second-lowest byte of the XMM
|
|
// register's four uint32 values to the low four bytes of that register.
|
|
//
|
|
// It transforms a little-endian 16-byte XMM value from
|
|
// ?i???j???k???l??
|
|
// to
|
|
// ijkl000000000000
|
|
DATA gather<>+0x00(SB)/8, $0x808080800d090501
|
|
DATA gather<>+0x08(SB)/8, $0x8080808080808080
|
|
|
|
DATA fxAlmost65536<>+0x00(SB)/8, $0x0000ffff0000ffff
|
|
DATA fxAlmost65536<>+0x08(SB)/8, $0x0000ffff0000ffff
|
|
DATA inverseFFFF<>+0x00(SB)/8, $0x8000800180008001
|
|
DATA inverseFFFF<>+0x08(SB)/8, $0x8000800180008001
|
|
|
|
GLOBL flAlmost65536<>(SB), (NOPTR+RODATA), $16
|
|
GLOBL flOne<>(SB), (NOPTR+RODATA), $16
|
|
GLOBL flSignMask<>(SB), (NOPTR+RODATA), $16
|
|
GLOBL scatterAndMulBy0x101<>(SB), (NOPTR+RODATA), $16
|
|
GLOBL gather<>(SB), (NOPTR+RODATA), $16
|
|
GLOBL fxAlmost65536<>(SB), (NOPTR+RODATA), $16
|
|
GLOBL inverseFFFF<>(SB), (NOPTR+RODATA), $16
|
|
|
|
// func haveSSE4_1() bool
|
|
TEXT ·haveSSE4_1(SB), NOSPLIT, $0
|
|
MOVQ $1, AX
|
|
CPUID
|
|
SHRQ $19, CX
|
|
ANDQ $1, CX
|
|
MOVB CX, ret+0(FP)
|
|
RET
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// func fixedAccumulateOpOverSIMD(dst []uint8, src []uint32)
|
|
//
|
|
// XMM registers. Variable names are per
|
|
// https://github.com/google/font-rs/blob/master/src/accumulate.c
|
|
//
|
|
// xmm0 scratch
|
|
// xmm1 x
|
|
// xmm2 y, z
|
|
// xmm3 -
|
|
// xmm4 -
|
|
// xmm5 fxAlmost65536
|
|
// xmm6 gather
|
|
// xmm7 offset
|
|
// xmm8 scatterAndMulBy0x101
|
|
// xmm9 fxAlmost65536
|
|
// xmm10 inverseFFFF
|
|
TEXT ·fixedAccumulateOpOverSIMD(SB), NOSPLIT, $0-48
|
|
|
|
MOVQ dst_base+0(FP), DI
|
|
MOVQ dst_len+8(FP), BX
|
|
MOVQ src_base+24(FP), SI
|
|
MOVQ src_len+32(FP), R10
|
|
|
|
// Sanity check that len(dst) >= len(src).
|
|
CMPQ BX, R10
|
|
JLT fxAccOpOverEnd
|
|
|
|
// R10 = len(src) &^ 3
|
|
// R11 = len(src)
|
|
MOVQ R10, R11
|
|
ANDQ $-4, R10
|
|
|
|
// fxAlmost65536 := XMM(0x0000ffff repeated four times) // Maximum of an uint16.
|
|
MOVOU fxAlmost65536<>(SB), X5
|
|
|
|
// gather := XMM(see above) // PSHUFB shuffle mask.
|
|
// scatterAndMulBy0x101 := XMM(see above) // PSHUFB shuffle mask.
|
|
// fxAlmost65536 := XMM(0x0000ffff repeated four times) // 0xffff.
|
|
// inverseFFFF := XMM(0x80008001 repeated four times) // Magic constant for dividing by 0xffff.
|
|
MOVOU gather<>(SB), X6
|
|
MOVOU scatterAndMulBy0x101<>(SB), X8
|
|
MOVOU fxAlmost65536<>(SB), X9
|
|
MOVOU inverseFFFF<>(SB), X10
|
|
|
|
// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
|
|
XORPS X7, X7
|
|
|
|
// i := 0
|
|
MOVQ $0, R9
|
|
|
|
fxAccOpOverLoop4:
|
|
// for i < (len(src) &^ 3)
|
|
CMPQ R9, R10
|
|
JAE fxAccOpOverLoop1
|
|
|
|
// 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
|
|
PADDD 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
|
|
PADDD X0, X1
|
|
|
|
// x += offset
|
|
PADDD X7, X1
|
|
|
|
// y = abs(x)
|
|
// y >>= 2 // Shift by 2*ϕ - 16.
|
|
// y = min(y, fxAlmost65536)
|
|
//
|
|
// pabsd %xmm1,%xmm2
|
|
// psrld $0x2,%xmm2
|
|
// pminud %xmm5,%xmm2
|
|
//
|
|
// Hopefully we'll get these opcode mnemonics into the assembler for Go
|
|
// 1.8. https://golang.org/issue/16007 isn't exactly the same thing, but
|
|
// it's similar.
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x1e; BYTE $0xd1
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x72; BYTE $0xd2; BYTE $0x02
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x3b; BYTE $0xd5
|
|
|
|
// z = convertToInt32(y)
|
|
// No-op.
|
|
|
|
// Blend over the dst's prior value. SIMD for i in 0..3:
|
|
//
|
|
// dstA := uint32(dst[i]) * 0x101
|
|
// maskA := z@i
|
|
// outA := dstA*(0xffff-maskA)/0xffff + maskA
|
|
// dst[i] = uint8(outA >> 8)
|
|
//
|
|
// First, set X0 to dstA*(0xfff-maskA).
|
|
MOVL (DI), X0
|
|
PSHUFB X8, X0
|
|
MOVOU X9, X11
|
|
PSUBL X2, X11
|
|
PMULLD X11, X0
|
|
|
|
// We implement uint32 division by 0xffff as multiplication by a magic
|
|
// constant (0x800080001) and then a shift by a magic constant (47).
|
|
// See TestDivideByFFFF for a justification.
|
|
//
|
|
// That multiplication widens from uint32 to uint64, so we have to
|
|
// duplicate and shift our four uint32s from one XMM register (X0) to
|
|
// two XMM registers (X0 and X11).
|
|
//
|
|
// Move the second and fourth uint32s in X0 to be the first and third
|
|
// uint32s in X11.
|
|
MOVOU X0, X11
|
|
PSRLQ $32, X11
|
|
|
|
// Multiply by magic, shift by magic.
|
|
//
|
|
// pmuludq %xmm10,%xmm0
|
|
// pmuludq %xmm10,%xmm11
|
|
BYTE $0x66; BYTE $0x41; BYTE $0x0f; BYTE $0xf4; BYTE $0xc2
|
|
BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0xf4; BYTE $0xda
|
|
PSRLQ $47, X0
|
|
PSRLQ $47, X11
|
|
|
|
// Merge the two registers back to one, X11, and add maskA.
|
|
PSLLQ $32, X11
|
|
XORPS X0, X11
|
|
PADDD X11, X2
|
|
|
|
// As per opSrcStore4, shuffle and copy the 4 second-lowest bytes.
|
|
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, R9
|
|
ADDQ $4, DI
|
|
ADDQ $16, SI
|
|
JMP fxAccOpOverLoop4
|
|
|
|
fxAccOpOverLoop1:
|
|
// for i < len(src)
|
|
CMPQ R9, R11
|
|
JAE fxAccOpOverEnd
|
|
|
|
// x = src[i] + offset
|
|
MOVL (SI), X1
|
|
PADDD X7, X1
|
|
|
|
// y = abs(x)
|
|
// y >>= 2 // Shift by 2*ϕ - 16.
|
|
// y = min(y, fxAlmost65536)
|
|
//
|
|
// pabsd %xmm1,%xmm2
|
|
// psrld $0x2,%xmm2
|
|
// pminud %xmm5,%xmm2
|
|
//
|
|
// Hopefully we'll get these opcode mnemonics into the assembler for Go
|
|
// 1.8. https://golang.org/issue/16007 isn't exactly the same thing, but
|
|
// it's similar.
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x1e; BYTE $0xd1
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x72; BYTE $0xd2; BYTE $0x02
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x3b; BYTE $0xd5
|
|
|
|
// z = convertToInt32(y)
|
|
// No-op.
|
|
|
|
// Blend over the dst's prior value.
|
|
//
|
|
// dstA := uint32(dst[0]) * 0x101
|
|
// maskA := z
|
|
// outA := dstA*(0xffff-maskA)/0xffff + maskA
|
|
// dst[0] = uint8(outA >> 8)
|
|
MOVBLZX (DI), R12
|
|
IMULL $0x101, R12
|
|
MOVL X2, R13
|
|
MOVL $0xffff, AX
|
|
SUBL R13, AX
|
|
MULL R12 // MULL's implicit arg is AX, and the result is stored in DX:AX.
|
|
MOVL $0x80008001, BX // Divide by 0xffff is to first multiply by a magic constant...
|
|
MULL BX // MULL's implicit arg is AX, and the result is stored in DX:AX.
|
|
SHRL $15, DX // ...and then shift by another magic constant (47 - 32 = 15).
|
|
ADDL DX, R13
|
|
SHRL $8, R13
|
|
MOVB R13, (DI)
|
|
|
|
// offset = x
|
|
MOVOU X1, X7
|
|
|
|
// i += 1
|
|
// dst = dst[1:]
|
|
// src = src[1:]
|
|
ADDQ $1, R9
|
|
ADDQ $1, DI
|
|
ADDQ $4, SI
|
|
JMP fxAccOpOverLoop1
|
|
|
|
fxAccOpOverEnd:
|
|
RET
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// func fixedAccumulateOpSrcSIMD(dst []uint8, src []uint32)
|
|
//
|
|
// XMM registers. Variable names are per
|
|
// https://github.com/google/font-rs/blob/master/src/accumulate.c
|
|
//
|
|
// xmm0 scratch
|
|
// xmm1 x
|
|
// xmm2 y, z
|
|
// xmm3 -
|
|
// xmm4 -
|
|
// xmm5 fxAlmost65536
|
|
// xmm6 gather
|
|
// xmm7 offset
|
|
// xmm8 -
|
|
// xmm9 -
|
|
// xmm10 -
|
|
TEXT ·fixedAccumulateOpSrcSIMD(SB), NOSPLIT, $0-48
|
|
|
|
MOVQ dst_base+0(FP), DI
|
|
MOVQ dst_len+8(FP), BX
|
|
MOVQ src_base+24(FP), SI
|
|
MOVQ src_len+32(FP), R10
|
|
|
|
// Sanity check that len(dst) >= len(src).
|
|
CMPQ BX, R10
|
|
JLT fxAccOpSrcEnd
|
|
|
|
// R10 = len(src) &^ 3
|
|
// R11 = len(src)
|
|
MOVQ R10, R11
|
|
ANDQ $-4, R10
|
|
|
|
// fxAlmost65536 := XMM(0x0000ffff repeated four times) // Maximum of an uint16.
|
|
MOVOU fxAlmost65536<>(SB), X5
|
|
|
|
// gather := XMM(see above) // PSHUFB shuffle mask.
|
|
MOVOU gather<>(SB), X6
|
|
|
|
// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
|
|
XORPS X7, X7
|
|
|
|
// i := 0
|
|
MOVQ $0, R9
|
|
|
|
fxAccOpSrcLoop4:
|
|
// for i < (len(src) &^ 3)
|
|
CMPQ R9, R10
|
|
JAE fxAccOpSrcLoop1
|
|
|
|
// 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
|
|
PADDD 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
|
|
PADDD X0, X1
|
|
|
|
// x += offset
|
|
PADDD X7, X1
|
|
|
|
// y = abs(x)
|
|
// y >>= 2 // Shift by 2*ϕ - 16.
|
|
// y = min(y, fxAlmost65536)
|
|
//
|
|
// pabsd %xmm1,%xmm2
|
|
// psrld $0x2,%xmm2
|
|
// pminud %xmm5,%xmm2
|
|
//
|
|
// Hopefully we'll get these opcode mnemonics into the assembler for Go
|
|
// 1.8. https://golang.org/issue/16007 isn't exactly the same thing, but
|
|
// it's similar.
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x1e; BYTE $0xd1
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x72; BYTE $0xd2; BYTE $0x02
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x3b; BYTE $0xd5
|
|
|
|
// z = convertToInt32(y)
|
|
// No-op.
|
|
|
|
// z = shuffleTheSecondLowestBytesOfEach4ByteElement(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, R9
|
|
ADDQ $4, DI
|
|
ADDQ $16, SI
|
|
JMP fxAccOpSrcLoop4
|
|
|
|
fxAccOpSrcLoop1:
|
|
// for i < len(src)
|
|
CMPQ R9, R11
|
|
JAE fxAccOpSrcEnd
|
|
|
|
// x = src[i] + offset
|
|
MOVL (SI), X1
|
|
PADDD X7, X1
|
|
|
|
// y = abs(x)
|
|
// y >>= 2 // Shift by 2*ϕ - 16.
|
|
// y = min(y, fxAlmost65536)
|
|
//
|
|
// pabsd %xmm1,%xmm2
|
|
// psrld $0x2,%xmm2
|
|
// pminud %xmm5,%xmm2
|
|
//
|
|
// Hopefully we'll get these opcode mnemonics into the assembler for Go
|
|
// 1.8. https://golang.org/issue/16007 isn't exactly the same thing, but
|
|
// it's similar.
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x1e; BYTE $0xd1
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x72; BYTE $0xd2; BYTE $0x02
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x3b; BYTE $0xd5
|
|
|
|
// z = convertToInt32(y)
|
|
// No-op.
|
|
|
|
// dst[0] = uint8(z>>8)
|
|
MOVL X2, BX
|
|
SHRL $8, BX
|
|
MOVB BX, (DI)
|
|
|
|
// offset = x
|
|
MOVOU X1, X7
|
|
|
|
// i += 1
|
|
// dst = dst[1:]
|
|
// src = src[1:]
|
|
ADDQ $1, R9
|
|
ADDQ $1, DI
|
|
ADDQ $4, SI
|
|
JMP fxAccOpSrcLoop1
|
|
|
|
fxAccOpSrcEnd:
|
|
RET
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// func fixedAccumulateMaskSIMD(buf []uint32)
|
|
//
|
|
// XMM registers. Variable names are per
|
|
// https://github.com/google/font-rs/blob/master/src/accumulate.c
|
|
//
|
|
// xmm0 scratch
|
|
// xmm1 x
|
|
// xmm2 y, z
|
|
// xmm3 -
|
|
// xmm4 -
|
|
// xmm5 fxAlmost65536
|
|
// xmm6 -
|
|
// xmm7 offset
|
|
// xmm8 -
|
|
// xmm9 -
|
|
// xmm10 -
|
|
TEXT ·fixedAccumulateMaskSIMD(SB), NOSPLIT, $0-24
|
|
|
|
MOVQ buf_base+0(FP), DI
|
|
MOVQ buf_len+8(FP), BX
|
|
MOVQ buf_base+0(FP), SI
|
|
MOVQ buf_len+8(FP), R10
|
|
|
|
// R10 = len(src) &^ 3
|
|
// R11 = len(src)
|
|
MOVQ R10, R11
|
|
ANDQ $-4, R10
|
|
|
|
// fxAlmost65536 := XMM(0x0000ffff repeated four times) // Maximum of an uint16.
|
|
MOVOU fxAlmost65536<>(SB), X5
|
|
|
|
// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
|
|
XORPS X7, X7
|
|
|
|
// i := 0
|
|
MOVQ $0, R9
|
|
|
|
fxAccMaskLoop4:
|
|
// for i < (len(src) &^ 3)
|
|
CMPQ R9, R10
|
|
JAE fxAccMaskLoop1
|
|
|
|
// 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
|
|
PADDD 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
|
|
PADDD X0, X1
|
|
|
|
// x += offset
|
|
PADDD X7, X1
|
|
|
|
// y = abs(x)
|
|
// y >>= 2 // Shift by 2*ϕ - 16.
|
|
// y = min(y, fxAlmost65536)
|
|
//
|
|
// pabsd %xmm1,%xmm2
|
|
// psrld $0x2,%xmm2
|
|
// pminud %xmm5,%xmm2
|
|
//
|
|
// Hopefully we'll get these opcode mnemonics into the assembler for Go
|
|
// 1.8. https://golang.org/issue/16007 isn't exactly the same thing, but
|
|
// it's similar.
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x1e; BYTE $0xd1
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x72; BYTE $0xd2; BYTE $0x02
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x3b; BYTE $0xd5
|
|
|
|
// z = convertToInt32(y)
|
|
// No-op.
|
|
|
|
// copy(dst[:4], z)
|
|
MOVOU 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, R9
|
|
ADDQ $16, DI
|
|
ADDQ $16, SI
|
|
JMP fxAccMaskLoop4
|
|
|
|
fxAccMaskLoop1:
|
|
// for i < len(src)
|
|
CMPQ R9, R11
|
|
JAE fxAccMaskEnd
|
|
|
|
// x = src[i] + offset
|
|
MOVL (SI), X1
|
|
PADDD X7, X1
|
|
|
|
// y = abs(x)
|
|
// y >>= 2 // Shift by 2*ϕ - 16.
|
|
// y = min(y, fxAlmost65536)
|
|
//
|
|
// pabsd %xmm1,%xmm2
|
|
// psrld $0x2,%xmm2
|
|
// pminud %xmm5,%xmm2
|
|
//
|
|
// Hopefully we'll get these opcode mnemonics into the assembler for Go
|
|
// 1.8. https://golang.org/issue/16007 isn't exactly the same thing, but
|
|
// it's similar.
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x1e; BYTE $0xd1
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x72; BYTE $0xd2; BYTE $0x02
|
|
BYTE $0x66; BYTE $0x0f; BYTE $0x38; BYTE $0x3b; BYTE $0xd5
|
|
|
|
// z = convertToInt32(y)
|
|
// No-op.
|
|
|
|
// dst[0] = uint32(z)
|
|
MOVL X2, (DI)
|
|
|
|
// offset = x
|
|
MOVOU X1, X7
|
|
|
|
// i += 1
|
|
// dst = dst[1:]
|
|
// src = src[1:]
|
|
ADDQ $1, R9
|
|
ADDQ $4, DI
|
|
ADDQ $4, SI
|
|
JMP fxAccMaskLoop1
|
|
|
|
fxAccMaskEnd:
|
|
RET
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// func floatingAccumulateOpOverSIMD(dst []uint8, src []float32)
|
|
//
|
|
// XMM registers. Variable names are per
|
|
// https://github.com/google/font-rs/blob/master/src/accumulate.c
|
|
//
|
|
// xmm0 scratch
|
|
// xmm1 x
|
|
// xmm2 y, z
|
|
// xmm3 flAlmost65536
|
|
// xmm4 flOne
|
|
// xmm5 flSignMask
|
|
// xmm6 gather
|
|
// xmm7 offset
|
|
// xmm8 scatterAndMulBy0x101
|
|
// xmm9 fxAlmost65536
|
|
// xmm10 inverseFFFF
|
|
TEXT ·floatingAccumulateOpOverSIMD(SB), NOSPLIT, $8-48
|
|
|
|
MOVQ dst_base+0(FP), DI
|
|
MOVQ dst_len+8(FP), BX
|
|
MOVQ src_base+24(FP), SI
|
|
MOVQ src_len+32(FP), R10
|
|
|
|
// Sanity check that len(dst) >= len(src).
|
|
CMPQ BX, R10
|
|
JLT flAccOpOverEnd
|
|
|
|
// R10 = len(src) &^ 3
|
|
// R11 = len(src)
|
|
MOVQ R10, R11
|
|
ANDQ $-4, R10
|
|
|
|
// Prepare to set MXCSR bits 13 and 14, so that the CVTPS2PL below is
|
|
// "Round To Zero".
|
|
STMXCSR mxcsrOrig-8(SP)
|
|
MOVL mxcsrOrig-8(SP), AX
|
|
ORL $0x6000, AX
|
|
MOVL AX, mxcsrNew-4(SP)
|
|
|
|
// flAlmost65536 := XMM(0x477fffff repeated four times) // 255.99998 * 256 as a float32.
|
|
// flOne := XMM(0x3f800000 repeated four times) // 1 as a float32.
|
|
// flSignMask := XMM(0x7fffffff repeated four times) // All but the sign bit of a float32.
|
|
MOVOU flAlmost65536<>(SB), X3
|
|
MOVOU flOne<>(SB), X4
|
|
MOVOU flSignMask<>(SB), X5
|
|
|
|
// gather := XMM(see above) // PSHUFB shuffle mask.
|
|
// scatterAndMulBy0x101 := XMM(see above) // PSHUFB shuffle mask.
|
|
// fxAlmost65536 := XMM(0x0000ffff repeated four times) // 0xffff.
|
|
// inverseFFFF := XMM(0x80008001 repeated four times) // Magic constant for dividing by 0xffff.
|
|
MOVOU gather<>(SB), X6
|
|
MOVOU scatterAndMulBy0x101<>(SB), X8
|
|
MOVOU fxAlmost65536<>(SB), X9
|
|
MOVOU inverseFFFF<>(SB), X10
|
|
|
|
// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
|
|
XORPS X7, X7
|
|
|
|
// i := 0
|
|
MOVQ $0, R9
|
|
|
|
flAccOpOverLoop4:
|
|
// for i < (len(src) &^ 3)
|
|
CMPQ R9, R10
|
|
JAE flAccOpOverLoop1
|
|
|
|
// 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
|
|
ADDPS 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
|
|
ADDPS X0, X1
|
|
|
|
// x += offset
|
|
ADDPS X7, X1
|
|
|
|
// y = x & flSignMask
|
|
// y = min(y, flOne)
|
|
// y = mul(y, flAlmost65536)
|
|
MOVOU X5, X2
|
|
ANDPS X1, X2
|
|
MINPS X4, X2
|
|
MULPS X3, X2
|
|
|
|
// z = convertToInt32(y)
|
|
LDMXCSR mxcsrNew-4(SP)
|
|
CVTPS2PL X2, X2
|
|
LDMXCSR mxcsrOrig-8(SP)
|
|
|
|
// Blend over the dst's prior value. SIMD for i in 0..3:
|
|
//
|
|
// dstA := uint32(dst[i]) * 0x101
|
|
// maskA := z@i
|
|
// outA := dstA*(0xffff-maskA)/0xffff + maskA
|
|
// dst[i] = uint8(outA >> 8)
|
|
//
|
|
// First, set X0 to dstA*(0xfff-maskA).
|
|
MOVL (DI), X0
|
|
PSHUFB X8, X0
|
|
MOVOU X9, X11
|
|
PSUBL X2, X11
|
|
PMULLD X11, X0
|
|
|
|
// We implement uint32 division by 0xffff as multiplication by a magic
|
|
// constant (0x800080001) and then a shift by a magic constant (47).
|
|
// See TestDivideByFFFF for a justification.
|
|
//
|
|
// That multiplication widens from uint32 to uint64, so we have to
|
|
// duplicate and shift our four uint32s from one XMM register (X0) to
|
|
// two XMM registers (X0 and X11).
|
|
//
|
|
// Move the second and fourth uint32s in X0 to be the first and third
|
|
// uint32s in X11.
|
|
MOVOU X0, X11
|
|
PSRLQ $32, X11
|
|
|
|
// Multiply by magic, shift by magic.
|
|
//
|
|
// pmuludq %xmm10,%xmm0
|
|
// pmuludq %xmm10,%xmm11
|
|
BYTE $0x66; BYTE $0x41; BYTE $0x0f; BYTE $0xf4; BYTE $0xc2
|
|
BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0xf4; BYTE $0xda
|
|
PSRLQ $47, X0
|
|
PSRLQ $47, X11
|
|
|
|
// Merge the two registers back to one, X11, and add maskA.
|
|
PSLLQ $32, X11
|
|
XORPS X0, X11
|
|
PADDD X11, X2
|
|
|
|
// As per opSrcStore4, shuffle and copy the 4 second-lowest bytes.
|
|
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, R9
|
|
ADDQ $4, DI
|
|
ADDQ $16, SI
|
|
JMP flAccOpOverLoop4
|
|
|
|
flAccOpOverLoop1:
|
|
// for i < len(src)
|
|
CMPQ R9, R11
|
|
JAE flAccOpOverEnd
|
|
|
|
// x = src[i] + offset
|
|
MOVL (SI), X1
|
|
ADDPS X7, X1
|
|
|
|
// y = x & flSignMask
|
|
// y = min(y, flOne)
|
|
// y = mul(y, flAlmost65536)
|
|
MOVOU X5, X2
|
|
ANDPS X1, X2
|
|
MINPS X4, X2
|
|
MULPS X3, X2
|
|
|
|
// z = convertToInt32(y)
|
|
LDMXCSR mxcsrNew-4(SP)
|
|
CVTPS2PL X2, X2
|
|
LDMXCSR mxcsrOrig-8(SP)
|
|
|
|
// Blend over the dst's prior value.
|
|
//
|
|
// dstA := uint32(dst[0]) * 0x101
|
|
// maskA := z
|
|
// outA := dstA*(0xffff-maskA)/0xffff + maskA
|
|
// dst[0] = uint8(outA >> 8)
|
|
MOVBLZX (DI), R12
|
|
IMULL $0x101, R12
|
|
MOVL X2, R13
|
|
MOVL $0xffff, AX
|
|
SUBL R13, AX
|
|
MULL R12 // MULL's implicit arg is AX, and the result is stored in DX:AX.
|
|
MOVL $0x80008001, BX // Divide by 0xffff is to first multiply by a magic constant...
|
|
MULL BX // MULL's implicit arg is AX, and the result is stored in DX:AX.
|
|
SHRL $15, DX // ...and then shift by another magic constant (47 - 32 = 15).
|
|
ADDL DX, R13
|
|
SHRL $8, R13
|
|
MOVB R13, (DI)
|
|
|
|
// offset = x
|
|
MOVOU X1, X7
|
|
|
|
// i += 1
|
|
// dst = dst[1:]
|
|
// src = src[1:]
|
|
ADDQ $1, R9
|
|
ADDQ $1, DI
|
|
ADDQ $4, SI
|
|
JMP flAccOpOverLoop1
|
|
|
|
flAccOpOverEnd:
|
|
RET
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// func floatingAccumulateOpSrcSIMD(dst []uint8, src []float32)
|
|
//
|
|
// XMM registers. Variable names are per
|
|
// https://github.com/google/font-rs/blob/master/src/accumulate.c
|
|
//
|
|
// xmm0 scratch
|
|
// xmm1 x
|
|
// xmm2 y, z
|
|
// xmm3 flAlmost65536
|
|
// xmm4 flOne
|
|
// xmm5 flSignMask
|
|
// xmm6 gather
|
|
// xmm7 offset
|
|
// xmm8 -
|
|
// xmm9 -
|
|
// xmm10 -
|
|
TEXT ·floatingAccumulateOpSrcSIMD(SB), NOSPLIT, $8-48
|
|
|
|
MOVQ dst_base+0(FP), DI
|
|
MOVQ dst_len+8(FP), BX
|
|
MOVQ src_base+24(FP), SI
|
|
MOVQ src_len+32(FP), R10
|
|
|
|
// Sanity check that len(dst) >= len(src).
|
|
CMPQ BX, R10
|
|
JLT flAccOpSrcEnd
|
|
|
|
// R10 = len(src) &^ 3
|
|
// R11 = len(src)
|
|
MOVQ R10, R11
|
|
ANDQ $-4, R10
|
|
|
|
// Prepare to set MXCSR bits 13 and 14, so that the CVTPS2PL below is
|
|
// "Round To Zero".
|
|
STMXCSR mxcsrOrig-8(SP)
|
|
MOVL mxcsrOrig-8(SP), AX
|
|
ORL $0x6000, AX
|
|
MOVL AX, mxcsrNew-4(SP)
|
|
|
|
// flAlmost65536 := XMM(0x477fffff repeated four times) // 255.99998 * 256 as a float32.
|
|
// flOne := XMM(0x3f800000 repeated four times) // 1 as a float32.
|
|
// flSignMask := XMM(0x7fffffff repeated four times) // All but the sign bit of a float32.
|
|
MOVOU flAlmost65536<>(SB), X3
|
|
MOVOU flOne<>(SB), X4
|
|
MOVOU flSignMask<>(SB), X5
|
|
|
|
// gather := XMM(see above) // PSHUFB shuffle mask.
|
|
MOVOU gather<>(SB), X6
|
|
|
|
// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
|
|
XORPS X7, X7
|
|
|
|
// i := 0
|
|
MOVQ $0, R9
|
|
|
|
flAccOpSrcLoop4:
|
|
// for i < (len(src) &^ 3)
|
|
CMPQ R9, R10
|
|
JAE flAccOpSrcLoop1
|
|
|
|
// 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
|
|
ADDPS 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
|
|
ADDPS X0, X1
|
|
|
|
// x += offset
|
|
ADDPS X7, X1
|
|
|
|
// y = x & flSignMask
|
|
// y = min(y, flOne)
|
|
// y = mul(y, flAlmost65536)
|
|
MOVOU X5, X2
|
|
ANDPS X1, X2
|
|
MINPS X4, X2
|
|
MULPS X3, X2
|
|
|
|
// z = convertToInt32(y)
|
|
LDMXCSR mxcsrNew-4(SP)
|
|
CVTPS2PL X2, X2
|
|
LDMXCSR mxcsrOrig-8(SP)
|
|
|
|
// z = shuffleTheSecondLowestBytesOfEach4ByteElement(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, R9
|
|
ADDQ $4, DI
|
|
ADDQ $16, SI
|
|
JMP flAccOpSrcLoop4
|
|
|
|
flAccOpSrcLoop1:
|
|
// for i < len(src)
|
|
CMPQ R9, R11
|
|
JAE flAccOpSrcEnd
|
|
|
|
// x = src[i] + offset
|
|
MOVL (SI), X1
|
|
ADDPS X7, X1
|
|
|
|
// y = x & flSignMask
|
|
// y = min(y, flOne)
|
|
// y = mul(y, flAlmost65536)
|
|
MOVOU X5, X2
|
|
ANDPS X1, X2
|
|
MINPS X4, X2
|
|
MULPS X3, X2
|
|
|
|
// z = convertToInt32(y)
|
|
LDMXCSR mxcsrNew-4(SP)
|
|
CVTPS2PL X2, X2
|
|
LDMXCSR mxcsrOrig-8(SP)
|
|
|
|
// dst[0] = uint8(z>>8)
|
|
MOVL X2, BX
|
|
SHRL $8, BX
|
|
MOVB BX, (DI)
|
|
|
|
// offset = x
|
|
MOVOU X1, X7
|
|
|
|
// i += 1
|
|
// dst = dst[1:]
|
|
// src = src[1:]
|
|
ADDQ $1, R9
|
|
ADDQ $1, DI
|
|
ADDQ $4, SI
|
|
JMP flAccOpSrcLoop1
|
|
|
|
flAccOpSrcEnd:
|
|
RET
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// func floatingAccumulateMaskSIMD(dst []uint32, src []float32)
|
|
//
|
|
// XMM registers. Variable names are per
|
|
// https://github.com/google/font-rs/blob/master/src/accumulate.c
|
|
//
|
|
// xmm0 scratch
|
|
// xmm1 x
|
|
// xmm2 y, z
|
|
// xmm3 flAlmost65536
|
|
// xmm4 flOne
|
|
// xmm5 flSignMask
|
|
// xmm6 -
|
|
// xmm7 offset
|
|
// xmm8 -
|
|
// xmm9 -
|
|
// xmm10 -
|
|
TEXT ·floatingAccumulateMaskSIMD(SB), NOSPLIT, $8-48
|
|
|
|
MOVQ dst_base+0(FP), DI
|
|
MOVQ dst_len+8(FP), BX
|
|
MOVQ src_base+24(FP), SI
|
|
MOVQ src_len+32(FP), R10
|
|
|
|
// Sanity check that len(dst) >= len(src).
|
|
CMPQ BX, R10
|
|
JLT flAccMaskEnd
|
|
|
|
// R10 = len(src) &^ 3
|
|
// R11 = len(src)
|
|
MOVQ R10, R11
|
|
ANDQ $-4, R10
|
|
|
|
// Prepare to set MXCSR bits 13 and 14, so that the CVTPS2PL below is
|
|
// "Round To Zero".
|
|
STMXCSR mxcsrOrig-8(SP)
|
|
MOVL mxcsrOrig-8(SP), AX
|
|
ORL $0x6000, AX
|
|
MOVL AX, mxcsrNew-4(SP)
|
|
|
|
// flAlmost65536 := XMM(0x477fffff repeated four times) // 255.99998 * 256 as a float32.
|
|
// flOne := XMM(0x3f800000 repeated four times) // 1 as a float32.
|
|
// flSignMask := XMM(0x7fffffff repeated four times) // All but the sign bit of a float32.
|
|
MOVOU flAlmost65536<>(SB), X3
|
|
MOVOU flOne<>(SB), X4
|
|
MOVOU flSignMask<>(SB), X5
|
|
|
|
// offset := XMM(0x00000000 repeated four times) // Cumulative sum.
|
|
XORPS X7, X7
|
|
|
|
// i := 0
|
|
MOVQ $0, R9
|
|
|
|
flAccMaskLoop4:
|
|
// for i < (len(src) &^ 3)
|
|
CMPQ R9, R10
|
|
JAE flAccMaskLoop1
|
|
|
|
// 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
|
|
ADDPS 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
|
|
ADDPS X0, X1
|
|
|
|
// x += offset
|
|
ADDPS X7, X1
|
|
|
|
// y = x & flSignMask
|
|
// y = min(y, flOne)
|
|
// y = mul(y, flAlmost65536)
|
|
MOVOU X5, X2
|
|
ANDPS X1, X2
|
|
MINPS X4, X2
|
|
MULPS X3, X2
|
|
|
|
// z = convertToInt32(y)
|
|
LDMXCSR mxcsrNew-4(SP)
|
|
CVTPS2PL X2, X2
|
|
LDMXCSR mxcsrOrig-8(SP)
|
|
|
|
// copy(dst[:4], z)
|
|
MOVOU 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, R9
|
|
ADDQ $16, DI
|
|
ADDQ $16, SI
|
|
JMP flAccMaskLoop4
|
|
|
|
flAccMaskLoop1:
|
|
// for i < len(src)
|
|
CMPQ R9, R11
|
|
JAE flAccMaskEnd
|
|
|
|
// x = src[i] + offset
|
|
MOVL (SI), X1
|
|
ADDPS X7, X1
|
|
|
|
// y = x & flSignMask
|
|
// y = min(y, flOne)
|
|
// y = mul(y, flAlmost65536)
|
|
MOVOU X5, X2
|
|
ANDPS X1, X2
|
|
MINPS X4, X2
|
|
MULPS X3, X2
|
|
|
|
// z = convertToInt32(y)
|
|
LDMXCSR mxcsrNew-4(SP)
|
|
CVTPS2PL X2, X2
|
|
LDMXCSR mxcsrOrig-8(SP)
|
|
|
|
// dst[0] = uint32(z)
|
|
MOVL X2, (DI)
|
|
|
|
// offset = x
|
|
MOVOU X1, X7
|
|
|
|
// i += 1
|
|
// dst = dst[1:]
|
|
// src = src[1:]
|
|
ADDQ $1, R9
|
|
ADDQ $4, DI
|
|
ADDQ $4, SI
|
|
JMP flAccMaskLoop1
|
|
|
|
flAccMaskEnd:
|
|
RET
|