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[AArch64] Improve ARGB4444TOARGB using SRI instructions

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Also avoid constructing the alpha component when it isn't needed by
introducing a new ARGB4444TORGB macro.

Reduction in runtime for selected kernels:

                       | Cortex-A55 | Cortex-A510 | Cortex-A76
ARGB4444ToARGBRow_NEON |     -27.5% |      -27.9% |     -29.1%
  ARGB4444ToUVRow_NEON |     -20.2% |      -25.2% |     -21.7%
   ARGB4444ToYRow_NEON |     -16.0% |      -20.2% |     -21.3%

Bug: libyuv:976
Change-Id: Ida061e1c49ba228b02c2f691a067b58edad073a8
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5509196
Reviewed-by: Justin Green <greenjustin@google.com>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
This commit is contained in:
George Steed 2024-03-16 16:06:39 +00:00 committed by Frank Barchard
parent 5618a5c762
commit 83c48c782a
1 changed files with 24 additions and 18 deletions
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42
source/row_neon64.cc
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@ -1684,19 +1684,25 @@ void ARGB1555ToARGBRow_NEON(const uint8_t* src_argb1555,
);
}
// Convert v0.8h to b = v0.8b g = v1.8b r = v2.8b
// clobbers v3
#define ARGB4444TOARGB \
"shrn v1.8b, v0.8h, #8 \n" /* v1(l) AR */ \
"xtn2 v1.16b, v0.8h \n" /* v1(h) GB */ \
"shl v2.16b, v1.16b, #4 \n" /* B,R BBBB0000 */ \
"ushr v3.16b, v1.16b, #4 \n" /* G,A 0000GGGG */ \
"ushr v0.16b, v2.16b, #4 \n" /* B,R 0000BBBB */ \
"shl v1.16b, v3.16b, #4 \n" /* G,A GGGG0000 */ \
"orr v2.16b, v0.16b, v2.16b \n" /* B,R BBBBBBBB */ \
"orr v3.16b, v1.16b, v3.16b \n" /* G,A GGGGGGGG */ \
"dup v0.2D, v2.D[1] \n" \
"dup v1.2D, v3.D[1] \n"
#define ARGB4444TOARGB \
/* Input: v0.8h = AAAARRRRGGGGBBBB */ \
"xtn v1.8b, v0.8h \n" /* GGGGBBBB */ \
"shrn v2.8b, v0.8h, #4 \n" /* RRRRxxxx */ \
"shrn v3.8b, v0.8h, #8 \n" /* AAAAxxxx */ \
"shl v0.8b, v1.8b, #4 \n" /* BBBB0000 */ \
"sri v1.8b, v1.8b, #4 \n" /* GGGGGGGG */ \
"sri v2.8b, v2.8b, #4 \n" /* RRRRRRRR */ \
"sri v3.8b, v3.8b, #4 \n" /* AAAAAAAA */ \
"sri v0.8b, v0.8b, #4 \n" /* BBBBBBBB */
#define ARGB4444TORGB \
/* Input: v0.8h = xxxxRRRRGGGGBBBB */ \
"xtn v1.8b, v0.8h \n" /* GGGGBBBB */ \
"shrn v2.8b, v0.8h, #4 \n" /* RRRRxxxx */ \
"shl v0.8b, v1.8b, #4 \n" /* BBBB0000 */ \
"sri v1.8b, v1.8b, #4 \n" /* GGGGGGGG */ \
"sri v2.8b, v2.8b, #4 \n" /* RRRRRRRR */ \
"sri v0.8b, v0.8b, #4 \n" /* BBBBBBBB */
void ARGB4444ToARGBRow_NEON(const uint8_t* src_argb4444,
uint8_t* dst_argb,
@ -2870,25 +2876,25 @@ void ARGB4444ToUVRow_NEON(const uint8_t* src_argb4444,
RGBTOUV_SETUP_REG // sets v20-v25
"1: \n"
"ld1 {v0.16b}, [%0], #16 \n" // load 8 ARGB4444 pixels.
ARGB4444TOARGB
ARGB4444TORGB
"uaddlp v16.4h, v0.8b \n" // B 8 bytes -> 4 shorts.
"prfm pldl1keep, [%0, 448] \n"
"uaddlp v17.4h, v1.8b \n" // G 8 bytes -> 4 shorts.
"uaddlp v18.4h, v2.8b \n" // R 8 bytes -> 4 shorts.
"ld1 {v0.16b}, [%0], #16 \n" // next 8 ARGB4444 pixels.
ARGB4444TOARGB
ARGB4444TORGB
"uaddlp v26.4h, v0.8b \n" // B 8 bytes -> 4 shorts.
"uaddlp v27.4h, v1.8b \n" // G 8 bytes -> 4 shorts.
"uaddlp v28.4h, v2.8b \n" // R 8 bytes -> 4 shorts.
"ld1 {v0.16b}, [%1], #16 \n" // load 8 ARGB4444 pixels.
ARGB4444TOARGB
ARGB4444TORGB
"uadalp v16.4h, v0.8b \n" // B 8 bytes -> 4 shorts.
"prfm pldl1keep, [%1, 448] \n"
"uadalp v17.4h, v1.8b \n" // G 8 bytes -> 4 shorts.
"uadalp v18.4h, v2.8b \n" // R 8 bytes -> 4 shorts.
"ld1 {v0.16b}, [%1], #16 \n" // next 8 ARGB4444 pixels.
ARGB4444TOARGB
ARGB4444TORGB
"uadalp v26.4h, v0.8b \n" // B 8 bytes -> 4 shorts.
"uadalp v27.4h, v1.8b \n" // G 8 bytes -> 4 shorts.
"uadalp v28.4h, v2.8b \n" // R 8 bytes -> 4 shorts.
@ -2983,7 +2989,7 @@ void ARGB4444ToYRow_NEON(const uint8_t* src_argb4444,
"1: \n"
"ld1 {v0.16b}, [%0], #16 \n" // load 8 ARGB4444 pixels.
"subs %w2, %w2, #8 \n" // 8 processed per loop.
ARGB4444TOARGB
ARGB4444TORGB
"umull v3.8h, v0.8b, v24.8b \n" // B
"prfm pldl1keep, [%0, 448] \n"
"umlal v3.8h, v1.8b, v25.8b \n" // G