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[AArch64] Add SVE2 implementation of I422ToRGB565Row

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This makes use of the same approach as the Neon code to avoid redundant
narrowing and then widening shifts by instead placing the values at the
top portion of the lanes and then shifting down from there instead.

Observed reduction in runtime compared to the existing Neon code:

Cortex-A510: -41.1%
Cortex-A520: -38.2%
Cortex-A715: -21.5%
Cortex-A720: -21.6%
  Cortex-X2: -21.6%
  Cortex-X3: -22.0%
  Cortex-X4: -23.5%
Cortex-X925: -21.7%

Bug: b/42280942
Change-Id: Id84872141435566bbf94a4bbf0227554b5b5fb91
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5802966
Reviewed-by: Justin Green <greenjustin@google.com>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
This commit is contained in:
George Steed 2024-05-03 17:46:40 +01:00 committed by Frank Barchard
parent 4621b0cc7f
commit f40042533c
3 changed files with 79 additions and 0 deletions
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7
include/libyuv/row.h
View File

@ -552,6 +552,7 @@ extern "C" {
#define HAS_I422ALPHATOARGBROW_SVE2
#define HAS_I422TOARGBROW_SVE2
#define HAS_I422TORGB24ROW_SVE2
#define HAS_I422TORGB565ROW_SVE2
#define HAS_I422TORGBAROW_SVE2
#define HAS_I444ALPHATOARGBROW_SVE2
#define HAS_I444TOARGBROW_SVE2
@ -1181,6 +1182,12 @@ void I422ToRGB565Row_NEON(const uint8_t* src_y,
uint8_t* dst_rgb565,
const struct YuvConstants* yuvconstants,
int width);
void I422ToRGB565Row_SVE2(const uint8_t* src_y,
const uint8_t* src_u,
const uint8_t* src_v,
uint8_t* dst_rgb565,
const struct YuvConstants* yuvconstants,
int width);
void I422ToARGB1555Row_NEON(const uint8_t* src_y,
const uint8_t* src_u,
const uint8_t* src_v,

10
source/convert_argb.cc
View File

@ -5880,6 +5880,11 @@ int I420ToRGB565Matrix(const uint8_t* src_y,
}
}
#endif
#if defined(HAS_I422TORGB565ROW_SVE2)
if (TestCpuFlag(kCpuHasSVE2)) {
I422ToRGB565Row = I422ToRGB565Row_SVE2;
}
#endif
#if defined(HAS_I422TORGB565ROW_MSA)
if (TestCpuFlag(kCpuHasMSA)) {
I422ToRGB565Row = I422ToRGB565Row_Any_MSA;
@ -6020,6 +6025,11 @@ int I422ToRGB565Matrix(const uint8_t* src_y,
}
}
#endif
#if defined(HAS_I422TORGB565ROW_SVE2)
if (TestCpuFlag(kCpuHasSVE2)) {
I422ToRGB565Row = I422ToRGB565Row_SVE2;
}
#endif
#if defined(HAS_I422TORGB565ROW_MSA)
if (TestCpuFlag(kCpuHasMSA)) {
I422ToRGB565Row = I422ToRGB565Row_Any_MSA;

62
source/row_sve.cc
View File

@ -181,6 +181,15 @@ extern "C" {
"uqshrnt z17.b, z21.h, #6 \n" /* G1 */ \
"uqshrnt z18.b, z22.h, #6 \n" /* R1 */
#define RGBTOARGB8_SVE_TOP_2X \
/* Inputs: B: z16.h, G: z17.h, R: z18.h */ \
"uqshl z16.h, p0/m, z16.h, #2 \n" /* B0 */ \
"uqshl z17.h, p0/m, z17.h, #2 \n" /* G0 */ \
"uqshl z18.h, p0/m, z18.h, #2 \n" /* R0 */ \
"uqshl z20.h, p0/m, z20.h, #2 \n" /* B1 */ \
"uqshl z21.h, p0/m, z21.h, #2 \n" /* G1 */ \
"uqshl z22.h, p0/m, z22.h, #2 \n" /* R1 */
// Convert from 2.14 fixed point RGB to 8 bit RGBA, interleaving as AB and GR
// pairs to allow us to use ST2 for storing rather than ST4.
#define RGBTORGBA8_SVE \
@ -377,6 +386,59 @@ void I422ToRGB24Row_SVE2(const uint8_t* src_y,
: "cc", "memory", YUVTORGB_SVE_REGS);
}
#define RGB8TORGB565_SVE_FROM_TOP_2X \
"sri z18.h, z17.h, #5 \n" /* rrrrrgggggg00000 */ \
"sri z22.h, z21.h, #5 \n" /* rrrrrgggggg00000 */ \
"sri z18.h, z16.h, #11 \n" /* rrrrrggggggbbbbb */ \
"sri z22.h, z20.h, #11 \n" /* rrrrrggggggbbbbb */ \
"mov z19.d, z22.d \n"
void I422ToRGB565Row_SVE2(const uint8_t* src_y,
const uint8_t* src_u,
const uint8_t* src_v,
uint8_t* dst_rgb565,
const struct YuvConstants* yuvconstants,
int width) {
uint64_t vl;
asm volatile(
"cntb %[vl] \n"
"ptrue p0.b \n" YUVTORGB_SVE_SETUP
"subs %w[width], %w[width], %w[vl] \n"
"b.lt 2f \n"
// Run bulk of computation with an all-true predicate to avoid predicate
// generation overhead.
"ptrue p1.b \n"
"1: \n" READYUV422_SVE_2X
I422TORGB_SVE_2X RGBTOARGB8_SVE_TOP_2X
"subs %w[width], %w[width], %w[vl] \n" //
RGB8TORGB565_SVE_FROM_TOP_2X
"st2h {z18.h, z19.h}, p1, [%[dst]] \n"
"incb %[dst], all, mul #2 \n"
"b.ge 1b \n"
"2: \n"
"adds %w[width], %w[width], %w[vl] \n"
"b.eq 99f \n"
// Calculate a predicate for the final iteration to deal with the tail.
"cnth %[vl] \n"
"whilelt p1.b, wzr, %w[width] \n" READYUV422_SVE_2X
I422TORGB_SVE_2X RGBTOARGB8_SVE_TOP_2X RGB8TORGB565_SVE_FROM_TOP_2X
"st2h {z18.h, z19.h}, p1, [%[dst]] \n"
"99: \n"
: [src_y] "+r"(src_y), // %[src_y]
[src_u] "+r"(src_u), // %[src_u]
[src_v] "+r"(src_v), // %[src_v]
[dst] "+r"(dst_rgb565), // %[dst]
[width] "+r"(width), // %[width]
[vl] "=&r"(vl) // %[vl]
: [kUVCoeff] "r"(&yuvconstants->kUVCoeff), // %[kUVCoeff]
[kRGBCoeffBias] "r"(&yuvconstants->kRGBCoeffBias) // %[kRGBCoeffBias]
: "cc", "memory", YUVTORGB_SVE_REGS);
}
void I422ToRGBARow_SVE2(const uint8_t* src_y,
const uint8_t* src_u,
const uint8_t* src_v,