Frank Barchard 47ba8e2160 Handle SsimWindowRow remainder in SIMD for AVX512BW, SVE2, SME, RVV ... Because each 8x8 SSIM window spans two 4x4 tiles horizontally, num_windows = (width - 5) >> 2, so aligned widths that are multiples of 64 (e.g. 64, 128, 640, 1280, 1920) always have remainder 15 (num_windows & 15 == 15). - Update SsimWindowRow_AVX512BW (compare_gcc.cc and compare_win.cc) to handle any remainder (1..15 windows) via k-masking (load_mask for the (rem + 1) * 4 tile words and win_mask for the rem window scores) and set win_simd_size = 1. - Add SsimWindowRow_SVE2, SsimWindowRow_SME, and SsimWindowRow_RVV with win_simd_size = 1 using predicated/vl-controlled loops so no C code (Ssim4x4Row_C or SsimWindowRow_C) is executed on AVX-512BW, SVE2, SME, or RVV CPUs for any image dimensions. - Remove LIBYUV_TARGET_AVX512BW __attribute__((target(...))) from compare_gcc.cc and GCC_HAS_AVX512 from cpu_support.h, using %%zmm0 directly in inline assembly. SSIM Performance (Before vs After): uArch / Target Before After Speedup -------------------------- --------- --------- ------- Coral RVV Verilator (64x16) 5302 cyc 2219 cyc 2.39x Coral RVV WindowRow (15w) 1854 cyc 308 cyc 6.02x Apple M6 SME (64x36 10kx) 16.41 ms 4.69 ms 3.50x Apple M6 SME (720p 1000x) 350.76 ms 66.09 ms 5.31x R=rrwinterton@gmail.com Bug: libyuv:352521931 Change-Id: Ic7d55184c60611af4a57d113cc4ee3d211debadf Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/8621918 Commit-Queue: Frank Barchard <fbarchard@google.com> Reviewed-by: richard winterton <rrwinterton@gmail.com>		2026-10-20 21:39:37 -07:00
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libyuv	Handle SsimWindowRow remainder in SIMD for AVX512BW, SVE2, SME, RVV	2026-10-20 21:39:37 -07:00
libyuv.h	libyuv.h: Add scale_rgb.h and remove scale_row.h	2026-08-26 19:06:22 -07:00