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Shave some instructions off a hot loop in affine transform

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On x86, GCC generates highly suboptimal code for this loop in its old form,
about 2x as many instructions as necessary. This decreases throughput
especially in an SMT setting. Clang does a better job but this change still has
some improvement. Note that the std::ptrdiff_t type is not optional; using an
unsigned type brings back the bad assembly. (Not sure why, but it seems
reliable on all the GCC versions I tested.)

passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 44672 W: 11841 L: 11527 D: 21304
Ptnml(0-2): 165, 4625, 12415, 4993, 138
https://tests.stockfishchess.org/tests/view/68d8111efa806e2e8393b10e

closes https://github.com/official-stockfish/Stockfish/pull/6331

No functional change
This commit is contained in:
Timothy Herchen
2025-09-28 21:04:29 +02:00
committed by Joost VandeVondele
parent 4f4f78f86e
commit 9b164d9520
2 changed files with 13 additions and 5 deletions
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@@ -243,6 +243,7 @@ Thanar2
thaspel
theo77186
TierynnB
Timothy Herchen (anematode)
Ting-Hsuan Huang (fffelix-huang)
Tobias Steinmann
Tomasz Sobczyk (Sopel97)