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ARGBToAR30 use vpmulhuw to replicate fields

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AR30 is optimized with 3 techniques
1. vpmulhuw is used to replicate 8 bits to 10 bits.
2. Two channels are processed at a time.  R and B, and A and G.
3. vpshufb is used to shift and mask 2 channels of R and B

Red Blue
With the 8 bit value in the upper bits, vpmulhuw by (1024+4) will produce a 10
bit value in the low 10 bits of each 16 bit value. This is whats wanted for the
blue channel. The red needs to be shifted 4 left, so multiply by (1024+4)*16 for
red.

Alpha Green
Alpha and Green are already in the high bits so vpand can zero out the other
bits, keeping just 2 upper bits of alpha and 8 bit green. The same multiplier
could be used for Green - (1024+4) putting the 10 bit green in the lsb.  Alpha
would be a simple multiplier to shift it into position.  It wants a gap of 10
above the green.  Green is 10 bits, so there are 6 bits in the low short.  4
more are needed, so a multiplier of 4 gets the 2 bits into the upper 16 bits,
and then a shift of 4 is a multiply of 16, so (4*16) = 64.  Then shift the
result left 10 to position the A and G channels.

Bug: libyuv:751
Test: ARGBToAR30_Opt
Change-Id: Ie4f20dce18203bae7b75acb1fd5232db8a8a4f11
Reviewed-on: https://chromium-review.googlesource.com/820046
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Cheng Wang <wangcheng@google.com>
This commit is contained in:
Frank Barchard 2017-12-11 18:21:34 -08:00 committed by Commit Bot
parent 0f98c3c1df
commit 11dd1b956f
2 changed files with 51 additions and 39 deletions
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89
source/row_gcc.cc
View File

@ -699,6 +699,23 @@ void ARGBToARGB4444Row_SSE2(const uint8* src, uint8* dst, int width) {
);
}
#endif // HAS_RGB24TOARGBROW_SSSE3
/*
Red Blue
With the 8 bit value in the upper bits, vpmulhuw by (1024+4) will produce a 10
bit value in the low 10 bits of each 16 bit value. This is whats wanted for the
blue channel. The red needs to be shifted 4 left, so multiply by (1024+4)*16 for
red.
Alpha Green
Alpha and Green are already in the high bits so vpand can zero out the other
bits, keeping just 2 upper bits of alpha and 8 bit green. The same multiplier
could be used for Green - (1024+4) putting the 10 bit green in the lsb. Alpha
would be a simple multiplier to shift it into position. It wants a gap of 10
above the green. Green is 10 bits, so there are 6 bits in the low short. 4
more are needed, so a multiplier of 4 gets the 2 bits into the upper 16 bits,
and then a shift of 4 is a multiply of 16, so (4*16) = 64. Then shift the
result left 10 to position the A and G channels.
*/
void ARGBToAR30Row_SSE2(const uint8* src, uint8* dst, int width) {
asm volatile(
@ -754,52 +771,48 @@ void ARGBToAR30Row_SSE2(const uint8* src, uint8* dst, int width) {
}
#ifdef HAS_ARGBTOAR30ROW_AVX2
// Shuffle table for converting RAW to RGB24. Last 8.
static const uvec8 kShuffleRB30 = {128u, 0u, 128u, 2u, 128u, 4u, 128u, 6u,
128u, 8u, 128u, 10u, 128u, 12u, 128u, 14u};
static const uint32 kMulRB10 = 1028 * 16 * 65536 + 1028;
static const uint32 kMaskRB10 = 0x3ff003ff;
static const uint32 kMaskAG10 = 0xc000ff00;
static const uint32 kMulAG10 = 64 * 65536 + 1028;
void ARGBToAR30Row_AVX2(const uint8* src, uint8* dst, int width) {
asm volatile(
"vpcmpeqb %%ymm4,%%ymm4,%%ymm4 \n" // 0x000000ff mask
"vpsrld $0x18,%%ymm4,%%ymm4 \n"
"vpcmpeqb %%ymm5,%%ymm5,%%ymm5 \n" // 0xc0000000 mask
"vpslld $30,%%ymm5,%%ymm5 \n"
"vbroadcastf128 %3,%%ymm2 \n" // shuffler for RB
"vbroadcastss %4,%%ymm3 \n" // multipler for RB
"vbroadcastss %5,%%ymm4 \n" // mask for R10 B10
"vbroadcastss %6,%%ymm5 \n" // mask for AG
"vbroadcastss %7,%%ymm6 \n" // multipler for AG
"sub %0,%1 \n"
LABELALIGN
"1: \n"
"vmovdqu (%0),%%ymm0 \n"
// alpha
"vpand %%ymm5,%%ymm0,%%ymm3 \n"
// red
"vpsrld $0x10,%%ymm0,%%ymm1 \n"
"vpand %%ymm4,%%ymm1,%%ymm1 \n"
"vpsrld $0x6,%%ymm1,%%ymm2 \n"
"vpslld $22,%%ymm1,%%ymm1 \n"
"vpslld $20,%%ymm2,%%ymm2 \n"
"vpor %%ymm1,%%ymm3,%%ymm3 \n"
"vpor %%ymm2,%%ymm3,%%ymm3 \n"
// green
"vpsrld $0x08,%%ymm0,%%ymm1 \n"
"vpand %%ymm4,%%ymm1,%%ymm1 \n"
"vpsrld $0x6,%%ymm1,%%ymm2 \n"
"vpslld $12,%%ymm1,%%ymm1 \n"
"vpslld $10,%%ymm2,%%ymm2 \n"
"vpor %%ymm1,%%ymm3,%%ymm3 \n"
"vpor %%ymm2,%%ymm3,%%ymm3 \n"
// blue
"vpand %%ymm4,%%ymm0,%%ymm1 \n"
"vpsrld $0x6,%%ymm1,%%ymm2 \n"
"vpslld $2,%%ymm1,%%ymm1 \n"
"vpor %%ymm1,%%ymm3,%%ymm3 \n"
"vpor %%ymm2,%%ymm3,%%ymm3 \n"
"vmovdqu %%ymm3,(%1) \n"
"vmovdqu (%0),%%ymm0 \n" // fetch 8 ARGB pixels
"vpshufb %%ymm2,%%ymm0,%%ymm1 \n" // R0B0
"vpand %%ymm5,%%ymm0,%%ymm0 \n" // A0G0
"vpmulhuw %%ymm3,%%ymm1,%%ymm1 \n" // X2 R16 X4 B10
"vpmulhuw %%ymm6,%%ymm0,%%ymm0 \n" // X10 A2 X10 G10
"vpand %%ymm4,%%ymm1,%%ymm1 \n" // X2 R10 X10 B10
"vpslld $10,%%ymm0,%%ymm0 \n" // A2 x10 G10 x10
"vpor %%ymm1,%%ymm0,%%ymm0 \n" // A2 R10 G10 B10
"vmovdqu %%ymm0,(%1,%0) \n" // store 8 AR30 pixels
"add $0x20,%0 \n"
"add $0x20,%1 \n"
"sub $0x8,%2 \n"
"jg 1b \n"
"vzeroupper \n"
: "+r"(src), // %0
"+r"(dst), // %1
"+r"(width) // %2
::"memory",
"cc", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5");
: "+r"(src), // %0
"+r"(dst), // %1
"+r"(width) // %2
: "m"(kShuffleRB30), // %3
"m"(kMulRB10), // %4
"m"(kMaskRB10), // %5
"m"(kMaskAG10), // %6
"m"(kMulAG10) // %7
: "memory", "cc", "eax", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6");
}
#endif

1
unit_test/convert_test.cc
View File

@ -1940,7 +1940,6 @@ TEST_F(LibYUVConvertTest, ARGBToAR30Row_Opt) {
align_buffer_page_end(src, kPixels * 4);
align_buffer_page_end(dst_opt, kPixels * 4);
align_buffer_page_end(dst_c, kPixels * 4);
MemRandomize(src, kPixels * 4);
memset(dst_opt, 0, kPixels * 4);
memset(dst_c, 1, kPixels * 4);