On 5/25/2025 9:44 PM, Chitra Dey Sarkar via ffmpeg-devel wrote:
H We have been profiling FFmpeg at Microsoft and have identified that ff_xyz12ToRgb48 has a high sample count ( profiled every 1ms )It seems like ff_xyz12ToRgb48 has performance penalty for 1. Unaligned read and write access 2. Access to xyz2rgb_matrix 3. Multiplication I would be interested in optimizing this code , wanted to check if there is an existing optimized version of this function, or any recommended approach to improve it(? I can move the repeated access to xyz2rgb_matrix outside the inner loop and load a full cache line at once to extract the X, Y, and Z values more efficiently-but I wanted to start by getting some initial feedback or thoughts before proceeding further
Niklas is currently working in a library rewrite, which may affect xyz scaling. But in any case, the obvious approach is a SIMD optimized implementation (SSE2, AVX2, etc) of this function.
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