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Add -funroll-loops to CXXFLAGS

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Optimize profiling data accuracy by enabling -funroll-loops during the profile
generation phase, in addition to its default activation by -fprofile-use.
This seems to produce a slightly faster binary, for most compilers.

make -j profile-build ARCH=x86-64-avx2

sf_base =  1392875 +/-   5905 (95%)
sf_test =  1402332 +/-   7303 (95%)
diff    =     9457 +/-   4413 (95%)
speedup = 0.67896% +/- 0.317% (95%)

STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 34784 W: 8970 L: 8665 D: 17149
Ptnml(0-2): 115, 3730, 9405, 4019, 123
https://tests.stockfishchess.org/tests/view/64d944815b17f7c21c0e92e1

closes https://github.com/official-stockfish/Stockfish/pull/4750

No functional change
This commit is contained in:
Disservin 2023-08-14 13:49:41 +02:00
parent fe0dca12f1
commit 46756996e7
1 changed files with 1 additions and 1 deletions
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2
src/Makefile
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@ -562,7 +562,7 @@ endif
### 3.3 Optimization
ifeq ($(optimize),yes)
CXXFLAGS += -O3
CXXFLAGS += -O3 -funroll-loops
ifeq ($(comp),gcc)
ifeq ($(OS), Android)