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libyuv: Optimize Convert8To8Row_NEON for 32-bit ARM

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Benchmark (Convert8To8Plane 1280x720, 1000 repeats):

32-bit: 106 ms -> 44 ms
64-bit: 52 ms (unchanged)
Bug: libyuv:42280902
Change-Id: I389a482f93404984759ef6223d7d191579d3578d
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/7812450
Reviewed-by: Justin Green <greenjustin@google.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>
This commit is contained in:
Frank Barchard 2026-05-04 12:46:28 -07:00
parent 2143edfa7a
commit 5a17753597
1 changed files with 4 additions and 6 deletions
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10
source/row_neon.cc
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@ -4011,12 +4011,10 @@ void Convert8To8Row_NEON(const uint8_t* src_y,
"vmull.u8 q1, d5, d8 \n"
"vmull.u8 q2, d6, d8 \n"
"vmull.u8 q3, d7, d8 \n"
"vshrn.u16 d0, q0, #8 \n"
"vshrn.u16 d1, q1, #8 \n"
"vshrn.u16 d2, q2, #8 \n"
"vshrn.u16 d3, q3, #8 \n"
"vadd.u8 q0, q0, q5 \n"
"vadd.u8 q1, q1, q5 \n"
"vuzp.8 q0, q1 \n"
"vuzp.8 q2, q3 \n"
"vadd.u8 q0, q1, q5 \n"
"vadd.u8 q1, q3, q5 \n"
"vst1.8 {q0, q1}, [%1]! \n" // store 32 pixels
"bgt 1b \n"
: "+r"(src_y), // %0