Optimize pixel counting in ImageFind using hardware POPCNT #4480
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Ray0907
commented
Nov 22, 2025
Ray0907
commented
- Replaced bit-by-bit loops in HScanForEdge with word-level processing using hardware population count (POPCNT).
- Added helper to handle 32-bit word alignment and boundary masking efficiently.
- Optimized VScanForEdge by hoisting bit position calculations out of the inner loop.
- Added cross-platform POPCOUNT macros supporting GCC/Clang (__builtin_popcount) and MSVC (__popcnt).
- Replaced bit-by-bit loops in HScanForEdge with word-level processing using hardware population count (POPCNT). - Added helper to handle 32-bit word alignment and boundary masking efficiently. - Optimized VScanForEdge by hoisting bit position calculations out of the inner loop. - Added cross-platform POPCOUNT macros supporting GCC/Clang (__builtin_popcount) and MSVC (__popcnt).
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What time improvements do you observe? |
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