ref: fd70206fa450eb5cb8e2fdd481aeaf0f8e906b9c
dir: /third_party/libyuv/source/scale_win.cc/
/*
* Copyright 2013 The LibYuv Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "libyuv/row.h"
#include "libyuv/scale_row.h"
#ifdef __cplusplus
namespace libyuv {
extern "C" {
#endif
// This module is for 32 bit Visual C x86 and clangcl
#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && defined(_MSC_VER)
// Offsets for source bytes 0 to 9
static const uvec8 kShuf0 = {0, 1, 3, 4, 5, 7, 8, 9,
128, 128, 128, 128, 128, 128, 128, 128};
// Offsets for source bytes 11 to 20 with 8 subtracted = 3 to 12.
static const uvec8 kShuf1 = {3, 4, 5, 7, 8, 9, 11, 12,
128, 128, 128, 128, 128, 128, 128, 128};
// Offsets for source bytes 21 to 31 with 16 subtracted = 5 to 31.
static const uvec8 kShuf2 = {5, 7, 8, 9, 11, 12, 13, 15,
128, 128, 128, 128, 128, 128, 128, 128};
// Offsets for source bytes 0 to 10
static const uvec8 kShuf01 = {0, 1, 1, 2, 2, 3, 4, 5, 5, 6, 6, 7, 8, 9, 9, 10};
// Offsets for source bytes 10 to 21 with 8 subtracted = 3 to 13.
static const uvec8 kShuf11 = {2, 3, 4, 5, 5, 6, 6, 7,
8, 9, 9, 10, 10, 11, 12, 13};
// Offsets for source bytes 21 to 31 with 16 subtracted = 5 to 31.
static const uvec8 kShuf21 = {5, 6, 6, 7, 8, 9, 9, 10,
10, 11, 12, 13, 13, 14, 14, 15};
// Coefficients for source bytes 0 to 10
static const uvec8 kMadd01 = {3, 1, 2, 2, 1, 3, 3, 1, 2, 2, 1, 3, 3, 1, 2, 2};
// Coefficients for source bytes 10 to 21
static const uvec8 kMadd11 = {1, 3, 3, 1, 2, 2, 1, 3, 3, 1, 2, 2, 1, 3, 3, 1};
// Coefficients for source bytes 21 to 31
static const uvec8 kMadd21 = {2, 2, 1, 3, 3, 1, 2, 2, 1, 3, 3, 1, 2, 2, 1, 3};
// Coefficients for source bytes 21 to 31
static const vec16 kRound34 = {2, 2, 2, 2, 2, 2, 2, 2};
static const uvec8 kShuf38a = {0, 3, 6, 8, 11, 14, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128};
static const uvec8 kShuf38b = {128, 128, 128, 128, 128, 128, 0, 3,
6, 8, 11, 14, 128, 128, 128, 128};
// Arrange words 0,3,6 into 0,1,2
static const uvec8 kShufAc = {0, 1, 6, 7, 12, 13, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128};
// Arrange words 0,3,6 into 3,4,5
static const uvec8 kShufAc3 = {128, 128, 128, 128, 128, 128, 0, 1,
6, 7, 12, 13, 128, 128, 128, 128};
// Scaling values for boxes of 3x3 and 2x3
static const uvec16 kScaleAc33 = {65536 / 9, 65536 / 9, 65536 / 6, 65536 / 9,
65536 / 9, 65536 / 6, 0, 0};
// Arrange first value for pixels 0,1,2,3,4,5
static const uvec8 kShufAb0 = {0, 128, 3, 128, 6, 128, 8, 128,
11, 128, 14, 128, 128, 128, 128, 128};
// Arrange second value for pixels 0,1,2,3,4,5
static const uvec8 kShufAb1 = {1, 128, 4, 128, 7, 128, 9, 128,
12, 128, 15, 128, 128, 128, 128, 128};
// Arrange third value for pixels 0,1,2,3,4,5
static const uvec8 kShufAb2 = {2, 128, 5, 128, 128, 128, 10, 128,
13, 128, 128, 128, 128, 128, 128, 128};
// Scaling values for boxes of 3x2 and 2x2
static const uvec16 kScaleAb2 = {65536 / 3, 65536 / 3, 65536 / 2, 65536 / 3,
65536 / 3, 65536 / 2, 0, 0};
// Reads 32 pixels, throws half away and writes 16 pixels.
__declspec(naked) void ScaleRowDown2_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_ptr
// src_stride ignored
mov edx, [esp + 12] // dst_ptr
mov ecx, [esp + 16] // dst_width
wloop:
movdqu xmm0, [eax]
movdqu xmm1, [eax + 16]
lea eax, [eax + 32]
psrlw xmm0, 8 // isolate odd pixels.
psrlw xmm1, 8
packuswb xmm0, xmm1
movdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 16
jg wloop
ret
}
}
// Blends 32x1 rectangle to 16x1.
__declspec(naked) void ScaleRowDown2Linear_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_ptr
// src_stride
mov edx, [esp + 12] // dst_ptr
mov ecx, [esp + 16] // dst_width
pcmpeqb xmm4, xmm4 // constant 0x0101
psrlw xmm4, 15
packuswb xmm4, xmm4
pxor xmm5, xmm5 // constant 0
wloop:
movdqu xmm0, [eax]
movdqu xmm1, [eax + 16]
lea eax, [eax + 32]
pmaddubsw xmm0, xmm4 // horizontal add
pmaddubsw xmm1, xmm4
pavgw xmm0, xmm5 // (x + 1) / 2
pavgw xmm1, xmm5
packuswb xmm0, xmm1
movdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 16
jg wloop
ret
}
}
// Blends 32x2 rectangle to 16x1.
__declspec(naked) void ScaleRowDown2Box_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
push esi
mov eax, [esp + 4 + 4] // src_ptr
mov esi, [esp + 4 + 8] // src_stride
mov edx, [esp + 4 + 12] // dst_ptr
mov ecx, [esp + 4 + 16] // dst_width
pcmpeqb xmm4, xmm4 // constant 0x0101
psrlw xmm4, 15
packuswb xmm4, xmm4
pxor xmm5, xmm5 // constant 0
wloop:
movdqu xmm0, [eax]
movdqu xmm1, [eax + 16]
movdqu xmm2, [eax + esi]
movdqu xmm3, [eax + esi + 16]
lea eax, [eax + 32]
pmaddubsw xmm0, xmm4 // horizontal add
pmaddubsw xmm1, xmm4
pmaddubsw xmm2, xmm4
pmaddubsw xmm3, xmm4
paddw xmm0, xmm2 // vertical add
paddw xmm1, xmm3
psrlw xmm0, 1
psrlw xmm1, 1
pavgw xmm0, xmm5 // (x + 1) / 2
pavgw xmm1, xmm5
packuswb xmm0, xmm1
movdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 16
jg wloop
pop esi
ret
}
}
#ifdef HAS_SCALEROWDOWN2_AVX2
// Reads 64 pixels, throws half away and writes 32 pixels.
__declspec(naked) void ScaleRowDown2_AVX2(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_ptr
// src_stride ignored
mov edx, [esp + 12] // dst_ptr
mov ecx, [esp + 16] // dst_width
wloop:
vmovdqu ymm0, [eax]
vmovdqu ymm1, [eax + 32]
lea eax, [eax + 64]
vpsrlw ymm0, ymm0, 8 // isolate odd pixels.
vpsrlw ymm1, ymm1, 8
vpackuswb ymm0, ymm0, ymm1
vpermq ymm0, ymm0, 0xd8 // unmutate vpackuswb
vmovdqu [edx], ymm0
lea edx, [edx + 32]
sub ecx, 32
jg wloop
vzeroupper
ret
}
}
// Blends 64x1 rectangle to 32x1.
__declspec(naked) void ScaleRowDown2Linear_AVX2(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_ptr
// src_stride
mov edx, [esp + 12] // dst_ptr
mov ecx, [esp + 16] // dst_width
vpcmpeqb ymm4, ymm4, ymm4 // '1' constant, 8b
vpsrlw ymm4, ymm4, 15
vpackuswb ymm4, ymm4, ymm4
vpxor ymm5, ymm5, ymm5 // constant 0
wloop:
vmovdqu ymm0, [eax]
vmovdqu ymm1, [eax + 32]
lea eax, [eax + 64]
vpmaddubsw ymm0, ymm0, ymm4 // horizontal add
vpmaddubsw ymm1, ymm1, ymm4
vpavgw ymm0, ymm0, ymm5 // (x + 1) / 2
vpavgw ymm1, ymm1, ymm5
vpackuswb ymm0, ymm0, ymm1
vpermq ymm0, ymm0, 0xd8 // unmutate vpackuswb
vmovdqu [edx], ymm0
lea edx, [edx + 32]
sub ecx, 32
jg wloop
vzeroupper
ret
}
}
// For rounding, average = (sum + 2) / 4
// becomes average((sum >> 1), 0)
// Blends 64x2 rectangle to 32x1.
__declspec(naked) void ScaleRowDown2Box_AVX2(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
push esi
mov eax, [esp + 4 + 4] // src_ptr
mov esi, [esp + 4 + 8] // src_stride
mov edx, [esp + 4 + 12] // dst_ptr
mov ecx, [esp + 4 + 16] // dst_width
vpcmpeqb ymm4, ymm4, ymm4 // '1' constant, 8b
vpsrlw ymm4, ymm4, 15
vpackuswb ymm4, ymm4, ymm4
vpxor ymm5, ymm5, ymm5 // constant 0
wloop:
vmovdqu ymm0, [eax]
vmovdqu ymm1, [eax + 32]
vmovdqu ymm2, [eax + esi]
vmovdqu ymm3, [eax + esi + 32]
lea eax, [eax + 64]
vpmaddubsw ymm0, ymm0, ymm4 // horizontal add
vpmaddubsw ymm1, ymm1, ymm4
vpmaddubsw ymm2, ymm2, ymm4
vpmaddubsw ymm3, ymm3, ymm4
vpaddw ymm0, ymm0, ymm2 // vertical add
vpaddw ymm1, ymm1, ymm3
vpsrlw ymm0, ymm0, 1 // (x + 2) / 4 = (x / 2 + 1) / 2
vpsrlw ymm1, ymm1, 1
vpavgw ymm0, ymm0, ymm5 // (x + 1) / 2
vpavgw ymm1, ymm1, ymm5
vpackuswb ymm0, ymm0, ymm1
vpermq ymm0, ymm0, 0xd8 // unmutate vpackuswb
vmovdqu [edx], ymm0
lea edx, [edx + 32]
sub ecx, 32
jg wloop
pop esi
vzeroupper
ret
}
}
#endif // HAS_SCALEROWDOWN2_AVX2
// Point samples 32 pixels to 8 pixels.
__declspec(naked) void ScaleRowDown4_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_ptr
// src_stride ignored
mov edx, [esp + 12] // dst_ptr
mov ecx, [esp + 16] // dst_width
pcmpeqb xmm5, xmm5 // generate mask 0x00ff0000
psrld xmm5, 24
pslld xmm5, 16
wloop:
movdqu xmm0, [eax]
movdqu xmm1, [eax + 16]
lea eax, [eax + 32]
pand xmm0, xmm5
pand xmm1, xmm5
packuswb xmm0, xmm1
psrlw xmm0, 8
packuswb xmm0, xmm0
movq qword ptr [edx], xmm0
lea edx, [edx + 8]
sub ecx, 8
jg wloop
ret
}
}
// Blends 32x4 rectangle to 8x1.
__declspec(naked) void ScaleRowDown4Box_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
push esi
push edi
mov eax, [esp + 8 + 4] // src_ptr
mov esi, [esp + 8 + 8] // src_stride
mov edx, [esp + 8 + 12] // dst_ptr
mov ecx, [esp + 8 + 16] // dst_width
lea edi, [esi + esi * 2] // src_stride * 3
pcmpeqb xmm4, xmm4 // constant 0x0101
psrlw xmm4, 15
movdqa xmm5, xmm4
packuswb xmm4, xmm4
psllw xmm5, 3 // constant 0x0008
wloop:
movdqu xmm0, [eax] // average rows
movdqu xmm1, [eax + 16]
movdqu xmm2, [eax + esi]
movdqu xmm3, [eax + esi + 16]
pmaddubsw xmm0, xmm4 // horizontal add
pmaddubsw xmm1, xmm4
pmaddubsw xmm2, xmm4
pmaddubsw xmm3, xmm4
paddw xmm0, xmm2 // vertical add rows 0, 1
paddw xmm1, xmm3
movdqu xmm2, [eax + esi * 2]
movdqu xmm3, [eax + esi * 2 + 16]
pmaddubsw xmm2, xmm4
pmaddubsw xmm3, xmm4
paddw xmm0, xmm2 // add row 2
paddw xmm1, xmm3
movdqu xmm2, [eax + edi]
movdqu xmm3, [eax + edi + 16]
lea eax, [eax + 32]
pmaddubsw xmm2, xmm4
pmaddubsw xmm3, xmm4
paddw xmm0, xmm2 // add row 3
paddw xmm1, xmm3
phaddw xmm0, xmm1
paddw xmm0, xmm5 // + 8 for round
psrlw xmm0, 4 // /16 for average of 4 * 4
packuswb xmm0, xmm0
movq qword ptr [edx], xmm0
lea edx, [edx + 8]
sub ecx, 8
jg wloop
pop edi
pop esi
ret
}
}
#ifdef HAS_SCALEROWDOWN4_AVX2
// Point samples 64 pixels to 16 pixels.
__declspec(naked) void ScaleRowDown4_AVX2(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_ptr
// src_stride ignored
mov edx, [esp + 12] // dst_ptr
mov ecx, [esp + 16] // dst_width
vpcmpeqb ymm5, ymm5, ymm5 // generate mask 0x00ff0000
vpsrld ymm5, ymm5, 24
vpslld ymm5, ymm5, 16
wloop:
vmovdqu ymm0, [eax]
vmovdqu ymm1, [eax + 32]
lea eax, [eax + 64]
vpand ymm0, ymm0, ymm5
vpand ymm1, ymm1, ymm5
vpackuswb ymm0, ymm0, ymm1
vpermq ymm0, ymm0, 0xd8 // unmutate vpackuswb
vpsrlw ymm0, ymm0, 8
vpackuswb ymm0, ymm0, ymm0
vpermq ymm0, ymm0, 0xd8 // unmutate vpackuswb
vmovdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 16
jg wloop
vzeroupper
ret
}
}
// Blends 64x4 rectangle to 16x1.
__declspec(naked) void ScaleRowDown4Box_AVX2(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
push esi
push edi
mov eax, [esp + 8 + 4] // src_ptr
mov esi, [esp + 8 + 8] // src_stride
mov edx, [esp + 8 + 12] // dst_ptr
mov ecx, [esp + 8 + 16] // dst_width
lea edi, [esi + esi * 2] // src_stride * 3
vpcmpeqb ymm4, ymm4, ymm4 // constant 0x0101
vpsrlw ymm4, ymm4, 15
vpsllw ymm5, ymm4, 3 // constant 0x0008
vpackuswb ymm4, ymm4, ymm4
wloop:
vmovdqu ymm0, [eax] // average rows
vmovdqu ymm1, [eax + 32]
vmovdqu ymm2, [eax + esi]
vmovdqu ymm3, [eax + esi + 32]
vpmaddubsw ymm0, ymm0, ymm4 // horizontal add
vpmaddubsw ymm1, ymm1, ymm4
vpmaddubsw ymm2, ymm2, ymm4
vpmaddubsw ymm3, ymm3, ymm4
vpaddw ymm0, ymm0, ymm2 // vertical add rows 0, 1
vpaddw ymm1, ymm1, ymm3
vmovdqu ymm2, [eax + esi * 2]
vmovdqu ymm3, [eax + esi * 2 + 32]
vpmaddubsw ymm2, ymm2, ymm4
vpmaddubsw ymm3, ymm3, ymm4
vpaddw ymm0, ymm0, ymm2 // add row 2
vpaddw ymm1, ymm1, ymm3
vmovdqu ymm2, [eax + edi]
vmovdqu ymm3, [eax + edi + 32]
lea eax, [eax + 64]
vpmaddubsw ymm2, ymm2, ymm4
vpmaddubsw ymm3, ymm3, ymm4
vpaddw ymm0, ymm0, ymm2 // add row 3
vpaddw ymm1, ymm1, ymm3
vphaddw ymm0, ymm0, ymm1 // mutates
vpermq ymm0, ymm0, 0xd8 // unmutate vphaddw
vpaddw ymm0, ymm0, ymm5 // + 8 for round
vpsrlw ymm0, ymm0, 4 // /32 for average of 4 * 4
vpackuswb ymm0, ymm0, ymm0
vpermq ymm0, ymm0, 0xd8 // unmutate vpackuswb
vmovdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 16
jg wloop
pop edi
pop esi
vzeroupper
ret
}
}
#endif // HAS_SCALEROWDOWN4_AVX2
// Point samples 32 pixels to 24 pixels.
// Produces three 8 byte values. For each 8 bytes, 16 bytes are read.
// Then shuffled to do the scaling.
__declspec(naked) void ScaleRowDown34_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_ptr
// src_stride ignored
mov edx, [esp + 12] // dst_ptr
mov ecx, [esp + 16] // dst_width
movdqa xmm3, xmmword ptr kShuf0
movdqa xmm4, xmmword ptr kShuf1
movdqa xmm5, xmmword ptr kShuf2
wloop:
movdqu xmm0, [eax]
movdqu xmm1, [eax + 16]
lea eax, [eax + 32]
movdqa xmm2, xmm1
palignr xmm1, xmm0, 8
pshufb xmm0, xmm3
pshufb xmm1, xmm4
pshufb xmm2, xmm5
movq qword ptr [edx], xmm0
movq qword ptr [edx + 8], xmm1
movq qword ptr [edx + 16], xmm2
lea edx, [edx + 24]
sub ecx, 24
jg wloop
ret
}
}
// Blends 32x2 rectangle to 24x1
// Produces three 8 byte values. For each 8 bytes, 16 bytes are read.
// Then shuffled to do the scaling.
// Register usage:
// xmm0 src_row 0
// xmm1 src_row 1
// xmm2 shuf 0
// xmm3 shuf 1
// xmm4 shuf 2
// xmm5 madd 0
// xmm6 madd 1
// xmm7 kRound34
// Note that movdqa+palign may be better than movdqu.
__declspec(naked) void ScaleRowDown34_1_Box_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
push esi
mov eax, [esp + 4 + 4] // src_ptr
mov esi, [esp + 4 + 8] // src_stride
mov edx, [esp + 4 + 12] // dst_ptr
mov ecx, [esp + 4 + 16] // dst_width
movdqa xmm2, xmmword ptr kShuf01
movdqa xmm3, xmmword ptr kShuf11
movdqa xmm4, xmmword ptr kShuf21
movdqa xmm5, xmmword ptr kMadd01
movdqa xmm6, xmmword ptr kMadd11
movdqa xmm7, xmmword ptr kRound34
wloop:
movdqu xmm0, [eax] // pixels 0..7
movdqu xmm1, [eax + esi]
pavgb xmm0, xmm1
pshufb xmm0, xmm2
pmaddubsw xmm0, xmm5
paddsw xmm0, xmm7
psrlw xmm0, 2
packuswb xmm0, xmm0
movq qword ptr [edx], xmm0
movdqu xmm0, [eax + 8] // pixels 8..15
movdqu xmm1, [eax + esi + 8]
pavgb xmm0, xmm1
pshufb xmm0, xmm3
pmaddubsw xmm0, xmm6
paddsw xmm0, xmm7
psrlw xmm0, 2
packuswb xmm0, xmm0
movq qword ptr [edx + 8], xmm0
movdqu xmm0, [eax + 16] // pixels 16..23
movdqu xmm1, [eax + esi + 16]
lea eax, [eax + 32]
pavgb xmm0, xmm1
pshufb xmm0, xmm4
movdqa xmm1, xmmword ptr kMadd21
pmaddubsw xmm0, xmm1
paddsw xmm0, xmm7
psrlw xmm0, 2
packuswb xmm0, xmm0
movq qword ptr [edx + 16], xmm0
lea edx, [edx + 24]
sub ecx, 24
jg wloop
pop esi
ret
}
}
// Note that movdqa+palign may be better than movdqu.
__declspec(naked) void ScaleRowDown34_0_Box_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
push esi
mov eax, [esp + 4 + 4] // src_ptr
mov esi, [esp + 4 + 8] // src_stride
mov edx, [esp + 4 + 12] // dst_ptr
mov ecx, [esp + 4 + 16] // dst_width
movdqa xmm2, xmmword ptr kShuf01
movdqa xmm3, xmmword ptr kShuf11
movdqa xmm4, xmmword ptr kShuf21
movdqa xmm5, xmmword ptr kMadd01
movdqa xmm6, xmmword ptr kMadd11
movdqa xmm7, xmmword ptr kRound34
wloop:
movdqu xmm0, [eax] // pixels 0..7
movdqu xmm1, [eax + esi]
pavgb xmm1, xmm0
pavgb xmm0, xmm1
pshufb xmm0, xmm2
pmaddubsw xmm0, xmm5
paddsw xmm0, xmm7
psrlw xmm0, 2
packuswb xmm0, xmm0
movq qword ptr [edx], xmm0
movdqu xmm0, [eax + 8] // pixels 8..15
movdqu xmm1, [eax + esi + 8]
pavgb xmm1, xmm0
pavgb xmm0, xmm1
pshufb xmm0, xmm3
pmaddubsw xmm0, xmm6
paddsw xmm0, xmm7
psrlw xmm0, 2
packuswb xmm0, xmm0
movq qword ptr [edx + 8], xmm0
movdqu xmm0, [eax + 16] // pixels 16..23
movdqu xmm1, [eax + esi + 16]
lea eax, [eax + 32]
pavgb xmm1, xmm0
pavgb xmm0, xmm1
pshufb xmm0, xmm4
movdqa xmm1, xmmword ptr kMadd21
pmaddubsw xmm0, xmm1
paddsw xmm0, xmm7
psrlw xmm0, 2
packuswb xmm0, xmm0
movq qword ptr [edx + 16], xmm0
lea edx, [edx+24]
sub ecx, 24
jg wloop
pop esi
ret
}
}
// 3/8 point sampler
// Scale 32 pixels to 12
__declspec(naked) void ScaleRowDown38_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_ptr
// src_stride ignored
mov edx, [esp + 12] // dst_ptr
mov ecx, [esp + 16] // dst_width
movdqa xmm4, xmmword ptr kShuf38a
movdqa xmm5, xmmword ptr kShuf38b
xloop:
movdqu xmm0, [eax] // 16 pixels -> 0,1,2,3,4,5
movdqu xmm1, [eax + 16] // 16 pixels -> 6,7,8,9,10,11
lea eax, [eax + 32]
pshufb xmm0, xmm4
pshufb xmm1, xmm5
paddusb xmm0, xmm1
movq qword ptr [edx], xmm0 // write 12 pixels
movhlps xmm1, xmm0
movd [edx + 8], xmm1
lea edx, [edx + 12]
sub ecx, 12
jg xloop
ret
}
}
// Scale 16x3 pixels to 6x1 with interpolation
__declspec(naked) void ScaleRowDown38_3_Box_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
push esi
mov eax, [esp + 4 + 4] // src_ptr
mov esi, [esp + 4 + 8] // src_stride
mov edx, [esp + 4 + 12] // dst_ptr
mov ecx, [esp + 4 + 16] // dst_width
movdqa xmm2, xmmword ptr kShufAc
movdqa xmm3, xmmword ptr kShufAc3
movdqa xmm4, xmmword ptr kScaleAc33
pxor xmm5, xmm5
xloop:
movdqu xmm0, [eax] // sum up 3 rows into xmm0/1
movdqu xmm6, [eax + esi]
movhlps xmm1, xmm0
movhlps xmm7, xmm6
punpcklbw xmm0, xmm5
punpcklbw xmm1, xmm5
punpcklbw xmm6, xmm5
punpcklbw xmm7, xmm5
paddusw xmm0, xmm6
paddusw xmm1, xmm7
movdqu xmm6, [eax + esi * 2]
lea eax, [eax + 16]
movhlps xmm7, xmm6
punpcklbw xmm6, xmm5
punpcklbw xmm7, xmm5
paddusw xmm0, xmm6
paddusw xmm1, xmm7
movdqa xmm6, xmm0 // 8 pixels -> 0,1,2 of xmm6
psrldq xmm0, 2
paddusw xmm6, xmm0
psrldq xmm0, 2
paddusw xmm6, xmm0
pshufb xmm6, xmm2
movdqa xmm7, xmm1 // 8 pixels -> 3,4,5 of xmm6
psrldq xmm1, 2
paddusw xmm7, xmm1
psrldq xmm1, 2
paddusw xmm7, xmm1
pshufb xmm7, xmm3
paddusw xmm6, xmm7
pmulhuw xmm6, xmm4 // divide by 9,9,6, 9,9,6
packuswb xmm6, xmm6
movd [edx], xmm6 // write 6 pixels
psrlq xmm6, 16
movd [edx + 2], xmm6
lea edx, [edx + 6]
sub ecx, 6
jg xloop
pop esi
ret
}
}
// Scale 16x2 pixels to 6x1 with interpolation
__declspec(naked) void ScaleRowDown38_2_Box_SSSE3(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst_ptr,
int dst_width) {
__asm {
push esi
mov eax, [esp + 4 + 4] // src_ptr
mov esi, [esp + 4 + 8] // src_stride
mov edx, [esp + 4 + 12] // dst_ptr
mov ecx, [esp + 4 + 16] // dst_width
movdqa xmm2, xmmword ptr kShufAb0
movdqa xmm3, xmmword ptr kShufAb1
movdqa xmm4, xmmword ptr kShufAb2
movdqa xmm5, xmmword ptr kScaleAb2
xloop:
movdqu xmm0, [eax] // average 2 rows into xmm0
movdqu xmm1, [eax + esi]
lea eax, [eax + 16]
pavgb xmm0, xmm1
movdqa xmm1, xmm0 // 16 pixels -> 0,1,2,3,4,5 of xmm1
pshufb xmm1, xmm2
movdqa xmm6, xmm0
pshufb xmm6, xmm3
paddusw xmm1, xmm6
pshufb xmm0, xmm4
paddusw xmm1, xmm0
pmulhuw xmm1, xmm5 // divide by 3,3,2, 3,3,2
packuswb xmm1, xmm1
movd [edx], xmm1 // write 6 pixels
psrlq xmm1, 16
movd [edx + 2], xmm1
lea edx, [edx + 6]
sub ecx, 6
jg xloop
pop esi
ret
}
}
// Reads 16 bytes and accumulates to 16 shorts at a time.
__declspec(naked) void ScaleAddRow_SSE2(const uint8_t* src_ptr,
uint16_t* dst_ptr,
int src_width) {
__asm {
mov eax, [esp + 4] // src_ptr
mov edx, [esp + 8] // dst_ptr
mov ecx, [esp + 12] // src_width
pxor xmm5, xmm5
// sum rows
xloop:
movdqu xmm3, [eax] // read 16 bytes
lea eax, [eax + 16]
movdqu xmm0, [edx] // read 16 words from destination
movdqu xmm1, [edx + 16]
movdqa xmm2, xmm3
punpcklbw xmm2, xmm5
punpckhbw xmm3, xmm5
paddusw xmm0, xmm2 // sum 16 words
paddusw xmm1, xmm3
movdqu [edx], xmm0 // write 16 words to destination
movdqu [edx + 16], xmm1
lea edx, [edx + 32]
sub ecx, 16
jg xloop
ret
}
}
#ifdef HAS_SCALEADDROW_AVX2
// Reads 32 bytes and accumulates to 32 shorts at a time.
__declspec(naked) void ScaleAddRow_AVX2(const uint8_t* src_ptr,
uint16_t* dst_ptr,
int src_width) {
__asm {
mov eax, [esp + 4] // src_ptr
mov edx, [esp + 8] // dst_ptr
mov ecx, [esp + 12] // src_width
vpxor ymm5, ymm5, ymm5
// sum rows
xloop:
vmovdqu ymm3, [eax] // read 32 bytes
lea eax, [eax + 32]
vpermq ymm3, ymm3, 0xd8 // unmutate for vpunpck
vpunpcklbw ymm2, ymm3, ymm5
vpunpckhbw ymm3, ymm3, ymm5
vpaddusw ymm0, ymm2, [edx] // sum 16 words
vpaddusw ymm1, ymm3, [edx + 32]
vmovdqu [edx], ymm0 // write 32 words to destination
vmovdqu [edx + 32], ymm1
lea edx, [edx + 64]
sub ecx, 32
jg xloop
vzeroupper
ret
}
}
#endif // HAS_SCALEADDROW_AVX2
// Constant for making pixels signed to avoid pmaddubsw
// saturation.
static const uvec8 kFsub80 = {0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80};
// Constant for making pixels unsigned and adding .5 for rounding.
static const uvec16 kFadd40 = {0x4040, 0x4040, 0x4040, 0x4040,
0x4040, 0x4040, 0x4040, 0x4040};
// Bilinear column filtering. SSSE3 version.
__declspec(naked) void ScaleFilterCols_SSSE3(uint8_t* dst_ptr,
const uint8_t* src_ptr,
int dst_width,
int x,
int dx) {
__asm {
push ebx
push esi
push edi
mov edi, [esp + 12 + 4] // dst_ptr
mov esi, [esp + 12 + 8] // src_ptr
mov ecx, [esp + 12 + 12] // dst_width
movd xmm2, [esp + 12 + 16] // x
movd xmm3, [esp + 12 + 20] // dx
mov eax, 0x04040000 // shuffle to line up fractions with pixel.
movd xmm5, eax
pcmpeqb xmm6, xmm6 // generate 0x007f for inverting fraction.
psrlw xmm6, 9
pcmpeqb xmm7, xmm7 // generate 0x0001
psrlw xmm7, 15
pextrw eax, xmm2, 1 // get x0 integer. preroll
sub ecx, 2
jl xloop29
movdqa xmm0, xmm2 // x1 = x0 + dx
paddd xmm0, xmm3
punpckldq xmm2, xmm0 // x0 x1
punpckldq xmm3, xmm3 // dx dx
paddd xmm3, xmm3 // dx * 2, dx * 2
pextrw edx, xmm2, 3 // get x1 integer. preroll
// 2 Pixel loop.
xloop2:
movdqa xmm1, xmm2 // x0, x1 fractions.
paddd xmm2, xmm3 // x += dx
movzx ebx, word ptr [esi + eax] // 2 source x0 pixels
movd xmm0, ebx
psrlw xmm1, 9 // 7 bit fractions.
movzx ebx, word ptr [esi + edx] // 2 source x1 pixels
movd xmm4, ebx
pshufb xmm1, xmm5 // 0011
punpcklwd xmm0, xmm4
psubb xmm0, xmmword ptr kFsub80 // make pixels signed.
pxor xmm1, xmm6 // 0..7f and 7f..0
paddusb xmm1, xmm7 // +1 so 0..7f and 80..1
pmaddubsw xmm1, xmm0 // 16 bit, 2 pixels.
pextrw eax, xmm2, 1 // get x0 integer. next iteration.
pextrw edx, xmm2, 3 // get x1 integer. next iteration.
paddw xmm1, xmmword ptr kFadd40 // make pixels unsigned and round.
psrlw xmm1, 7 // 8.7 fixed point to low 8 bits.
packuswb xmm1, xmm1 // 8 bits, 2 pixels.
movd ebx, xmm1
mov [edi], bx
lea edi, [edi + 2]
sub ecx, 2 // 2 pixels
jge xloop2
xloop29:
add ecx, 2 - 1
jl xloop99
// 1 pixel remainder
movzx ebx, word ptr [esi + eax] // 2 source x0 pixels
movd xmm0, ebx
psrlw xmm2, 9 // 7 bit fractions.
pshufb xmm2, xmm5 // 0011
psubb xmm0, xmmword ptr kFsub80 // make pixels signed.
pxor xmm2, xmm6 // 0..7f and 7f..0
paddusb xmm2, xmm7 // +1 so 0..7f and 80..1
pmaddubsw xmm2, xmm0 // 16 bit
paddw xmm2, xmmword ptr kFadd40 // make pixels unsigned and round.
psrlw xmm2, 7 // 8.7 fixed point to low 8 bits.
packuswb xmm2, xmm2 // 8 bits
movd ebx, xmm2
mov [edi], bl
xloop99:
pop edi
pop esi
pop ebx
ret
}
}
// Reads 16 pixels, duplicates them and writes 32 pixels.
__declspec(naked) void ScaleColsUp2_SSE2(uint8_t* dst_ptr,
const uint8_t* src_ptr,
int dst_width,
int x,
int dx) {
__asm {
mov edx, [esp + 4] // dst_ptr
mov eax, [esp + 8] // src_ptr
mov ecx, [esp + 12] // dst_width
wloop:
movdqu xmm0, [eax]
lea eax, [eax + 16]
movdqa xmm1, xmm0
punpcklbw xmm0, xmm0
punpckhbw xmm1, xmm1
movdqu [edx], xmm0
movdqu [edx + 16], xmm1
lea edx, [edx + 32]
sub ecx, 32
jg wloop
ret
}
}
// Reads 8 pixels, throws half away and writes 4 even pixels (0, 2, 4, 6)
__declspec(naked) void ScaleARGBRowDown2_SSE2(const uint8_t* src_argb,
ptrdiff_t src_stride,
uint8_t* dst_argb,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_argb
// src_stride ignored
mov edx, [esp + 12] // dst_argb
mov ecx, [esp + 16] // dst_width
wloop:
movdqu xmm0, [eax]
movdqu xmm1, [eax + 16]
lea eax, [eax + 32]
shufps xmm0, xmm1, 0xdd
movdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 4
jg wloop
ret
}
}
// Blends 8x1 rectangle to 4x1.
__declspec(naked) void ScaleARGBRowDown2Linear_SSE2(const uint8_t* src_argb,
ptrdiff_t src_stride,
uint8_t* dst_argb,
int dst_width) {
__asm {
mov eax, [esp + 4] // src_argb
// src_stride ignored
mov edx, [esp + 12] // dst_argb
mov ecx, [esp + 16] // dst_width
wloop:
movdqu xmm0, [eax]
movdqu xmm1, [eax + 16]
lea eax, [eax + 32]
movdqa xmm2, xmm0
shufps xmm0, xmm1, 0x88 // even pixels
shufps xmm2, xmm1, 0xdd // odd pixels
pavgb xmm0, xmm2
movdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 4
jg wloop
ret
}
}
// Blends 8x2 rectangle to 4x1.
__declspec(naked) void ScaleARGBRowDown2Box_SSE2(const uint8_t* src_argb,
ptrdiff_t src_stride,
uint8_t* dst_argb,
int dst_width) {
__asm {
push esi
mov eax, [esp + 4 + 4] // src_argb
mov esi, [esp + 4 + 8] // src_stride
mov edx, [esp + 4 + 12] // dst_argb
mov ecx, [esp + 4 + 16] // dst_width
wloop:
movdqu xmm0, [eax]
movdqu xmm1, [eax + 16]
movdqu xmm2, [eax + esi]
movdqu xmm3, [eax + esi + 16]
lea eax, [eax + 32]
pavgb xmm0, xmm2 // average rows
pavgb xmm1, xmm3
movdqa xmm2, xmm0 // average columns (8 to 4 pixels)
shufps xmm0, xmm1, 0x88 // even pixels
shufps xmm2, xmm1, 0xdd // odd pixels
pavgb xmm0, xmm2
movdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 4
jg wloop
pop esi
ret
}
}
// Reads 4 pixels at a time.
__declspec(naked) void ScaleARGBRowDownEven_SSE2(const uint8_t* src_argb,
ptrdiff_t src_stride,
int src_stepx,
uint8_t* dst_argb,
int dst_width) {
__asm {
push ebx
push edi
mov eax, [esp + 8 + 4] // src_argb
// src_stride ignored
mov ebx, [esp + 8 + 12] // src_stepx
mov edx, [esp + 8 + 16] // dst_argb
mov ecx, [esp + 8 + 20] // dst_width
lea ebx, [ebx * 4]
lea edi, [ebx + ebx * 2]
wloop:
movd xmm0, [eax]
movd xmm1, [eax + ebx]
punpckldq xmm0, xmm1
movd xmm2, [eax + ebx * 2]
movd xmm3, [eax + edi]
lea eax, [eax + ebx * 4]
punpckldq xmm2, xmm3
punpcklqdq xmm0, xmm2
movdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 4
jg wloop
pop edi
pop ebx
ret
}
}
// Blends four 2x2 to 4x1.
__declspec(naked) void ScaleARGBRowDownEvenBox_SSE2(const uint8_t* src_argb,
ptrdiff_t src_stride,
int src_stepx,
uint8_t* dst_argb,
int dst_width) {
__asm {
push ebx
push esi
push edi
mov eax, [esp + 12 + 4] // src_argb
mov esi, [esp + 12 + 8] // src_stride
mov ebx, [esp + 12 + 12] // src_stepx
mov edx, [esp + 12 + 16] // dst_argb
mov ecx, [esp + 12 + 20] // dst_width
lea esi, [eax + esi] // row1 pointer
lea ebx, [ebx * 4]
lea edi, [ebx + ebx * 2]
wloop:
movq xmm0, qword ptr [eax] // row0 4 pairs
movhps xmm0, qword ptr [eax + ebx]
movq xmm1, qword ptr [eax + ebx * 2]
movhps xmm1, qword ptr [eax + edi]
lea eax, [eax + ebx * 4]
movq xmm2, qword ptr [esi] // row1 4 pairs
movhps xmm2, qword ptr [esi + ebx]
movq xmm3, qword ptr [esi + ebx * 2]
movhps xmm3, qword ptr [esi + edi]
lea esi, [esi + ebx * 4]
pavgb xmm0, xmm2 // average rows
pavgb xmm1, xmm3
movdqa xmm2, xmm0 // average columns (8 to 4 pixels)
shufps xmm0, xmm1, 0x88 // even pixels
shufps xmm2, xmm1, 0xdd // odd pixels
pavgb xmm0, xmm2
movdqu [edx], xmm0
lea edx, [edx + 16]
sub ecx, 4
jg wloop
pop edi
pop esi
pop ebx
ret
}
}
// Column scaling unfiltered. SSE2 version.
__declspec(naked) void ScaleARGBCols_SSE2(uint8_t* dst_argb,
const uint8_t* src_argb,
int dst_width,
int x,
int dx) {
__asm {
push edi
push esi
mov edi, [esp + 8 + 4] // dst_argb
mov esi, [esp + 8 + 8] // src_argb
mov ecx, [esp + 8 + 12] // dst_width
movd xmm2, [esp + 8 + 16] // x
movd xmm3, [esp + 8 + 20] // dx
pshufd xmm2, xmm2, 0 // x0 x0 x0 x0
pshufd xmm0, xmm3, 0x11 // dx 0 dx 0
paddd xmm2, xmm0
paddd xmm3, xmm3 // 0, 0, 0, dx * 2
pshufd xmm0, xmm3, 0x05 // dx * 2, dx * 2, 0, 0
paddd xmm2, xmm0 // x3 x2 x1 x0
paddd xmm3, xmm3 // 0, 0, 0, dx * 4
pshufd xmm3, xmm3, 0 // dx * 4, dx * 4, dx * 4, dx * 4
pextrw eax, xmm2, 1 // get x0 integer.
pextrw edx, xmm2, 3 // get x1 integer.
cmp ecx, 0
jle xloop99
sub ecx, 4
jl xloop49
// 4 Pixel loop.
xloop4:
movd xmm0, [esi + eax * 4] // 1 source x0 pixels
movd xmm1, [esi + edx * 4] // 1 source x1 pixels
pextrw eax, xmm2, 5 // get x2 integer.
pextrw edx, xmm2, 7 // get x3 integer.
paddd xmm2, xmm3 // x += dx
punpckldq xmm0, xmm1 // x0 x1
movd xmm1, [esi + eax * 4] // 1 source x2 pixels
movd xmm4, [esi + edx * 4] // 1 source x3 pixels
pextrw eax, xmm2, 1 // get x0 integer. next iteration.
pextrw edx, xmm2, 3 // get x1 integer. next iteration.
punpckldq xmm1, xmm4 // x2 x3
punpcklqdq xmm0, xmm1 // x0 x1 x2 x3
movdqu [edi], xmm0
lea edi, [edi + 16]
sub ecx, 4 // 4 pixels
jge xloop4
xloop49:
test ecx, 2
je xloop29
// 2 Pixels.
movd xmm0, [esi + eax * 4] // 1 source x0 pixels
movd xmm1, [esi + edx * 4] // 1 source x1 pixels
pextrw eax, xmm2, 5 // get x2 integer.
punpckldq xmm0, xmm1 // x0 x1
movq qword ptr [edi], xmm0
lea edi, [edi + 8]
xloop29:
test ecx, 1
je xloop99
// 1 Pixels.
movd xmm0, [esi + eax * 4] // 1 source x2 pixels
movd dword ptr [edi], xmm0
xloop99:
pop esi
pop edi
ret
}
}
// Bilinear row filtering combines 2x1 -> 1x1. SSSE3 version.
// TODO(fbarchard): Port to Neon
// Shuffle table for arranging 2 pixels into pairs for pmaddubsw
static const uvec8 kShuffleColARGB = {
0u, 4u, 1u, 5u, 2u, 6u, 3u, 7u, // bbggrraa 1st pixel
8u, 12u, 9u, 13u, 10u, 14u, 11u, 15u // bbggrraa 2nd pixel
};
// Shuffle table for duplicating 2 fractions into 8 bytes each
static const uvec8 kShuffleFractions = {
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 4u, 4u, 4u, 4u, 4u, 4u, 4u, 4u,
};
__declspec(naked) void ScaleARGBFilterCols_SSSE3(uint8_t* dst_argb,
const uint8_t* src_argb,
int dst_width,
int x,
int dx) {
__asm {
push esi
push edi
mov edi, [esp + 8 + 4] // dst_argb
mov esi, [esp + 8 + 8] // src_argb
mov ecx, [esp + 8 + 12] // dst_width
movd xmm2, [esp + 8 + 16] // x
movd xmm3, [esp + 8 + 20] // dx
movdqa xmm4, xmmword ptr kShuffleColARGB
movdqa xmm5, xmmword ptr kShuffleFractions
pcmpeqb xmm6, xmm6 // generate 0x007f for inverting fraction.
psrlw xmm6, 9
pextrw eax, xmm2, 1 // get x0 integer. preroll
sub ecx, 2
jl xloop29
movdqa xmm0, xmm2 // x1 = x0 + dx
paddd xmm0, xmm3
punpckldq xmm2, xmm0 // x0 x1
punpckldq xmm3, xmm3 // dx dx
paddd xmm3, xmm3 // dx * 2, dx * 2
pextrw edx, xmm2, 3 // get x1 integer. preroll
// 2 Pixel loop.
xloop2:
movdqa xmm1, xmm2 // x0, x1 fractions.
paddd xmm2, xmm3 // x += dx
movq xmm0, qword ptr [esi + eax * 4] // 2 source x0 pixels
psrlw xmm1, 9 // 7 bit fractions.
movhps xmm0, qword ptr [esi + edx * 4] // 2 source x1 pixels
pshufb xmm1, xmm5 // 0000000011111111
pshufb xmm0, xmm4 // arrange pixels into pairs
pxor xmm1, xmm6 // 0..7f and 7f..0
pmaddubsw xmm0, xmm1 // argb_argb 16 bit, 2 pixels.
pextrw eax, xmm2, 1 // get x0 integer. next iteration.
pextrw edx, xmm2, 3 // get x1 integer. next iteration.
psrlw xmm0, 7 // argb 8.7 fixed point to low 8 bits.
packuswb xmm0, xmm0 // argb_argb 8 bits, 2 pixels.
movq qword ptr [edi], xmm0
lea edi, [edi + 8]
sub ecx, 2 // 2 pixels
jge xloop2
xloop29:
add ecx, 2 - 1
jl xloop99
// 1 pixel remainder
psrlw xmm2, 9 // 7 bit fractions.
movq xmm0, qword ptr [esi + eax * 4] // 2 source x0 pixels
pshufb xmm2, xmm5 // 00000000
pshufb xmm0, xmm4 // arrange pixels into pairs
pxor xmm2, xmm6 // 0..7f and 7f..0
pmaddubsw xmm0, xmm2 // argb 16 bit, 1 pixel.
psrlw xmm0, 7
packuswb xmm0, xmm0 // argb 8 bits, 1 pixel.
movd [edi], xmm0
xloop99:
pop edi
pop esi
ret
}
}
// Reads 4 pixels, duplicates them and writes 8 pixels.
__declspec(naked) void ScaleARGBColsUp2_SSE2(uint8_t* dst_argb,
const uint8_t* src_argb,
int dst_width,
int x,
int dx) {
__asm {
mov edx, [esp + 4] // dst_argb
mov eax, [esp + 8] // src_argb
mov ecx, [esp + 12] // dst_width
wloop:
movdqu xmm0, [eax]
lea eax, [eax + 16]
movdqa xmm1, xmm0
punpckldq xmm0, xmm0
punpckhdq xmm1, xmm1
movdqu [edx], xmm0
movdqu [edx + 16], xmm1
lea edx, [edx + 32]
sub ecx, 8
jg wloop
ret
}
}
// Divide num by div and return as 16.16 fixed point result.
__declspec(naked) int FixedDiv_X86(int num, int div) {
__asm {
mov eax, [esp + 4] // num
cdq // extend num to 64 bits
shld edx, eax, 16 // 32.16
shl eax, 16
idiv dword ptr [esp + 8]
ret
}
}
// Divide num by div and return as 16.16 fixed point result.
__declspec(naked) int FixedDiv1_X86(int num, int div) {
__asm {
mov eax, [esp + 4] // num
mov ecx, [esp + 8] // denom
cdq // extend num to 64 bits
shld edx, eax, 16 // 32.16
shl eax, 16
sub eax, 0x00010001
sbb edx, 0
sub ecx, 1
idiv ecx
ret
}
}
#endif // !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86)
#ifdef __cplusplus
} // extern "C"
} // namespace libyuv
#endif