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Add sse4 if bmi2 is enabled

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The only change done to the Makefile to get a somewhat faster binary as
discussed in #2291 is to add -msse4 to the compile options of the bmi2 build.
Since all processors supporting bmi2 also support sse4 this can be done easily.
It is a useful step to avoid sending around custom and poorly tested builds.

The speedup isn't enough to pass [0,4] but it is roughly 1.15Elo and a LOS of 90%:
LLR: -2.95 (-2.94,2.94) [0.00,4.00]
Total: 93009 W: 20519 L: 20316 D: 52174

Also rewrite the documentation for the user when using `make --help`, so that
the order of architectures for x86-64 has the more performant build one on top.

Closes https://github.com/official-stockfish/Stockfish/pull/2300

No functional change
This commit is contained in:
Joost VandeVondele 2019-09-12 21:25:58 +02:00 • committed by Stéphane Nicolet
parent 8aecf26981
commit db00e1625e
1 changed files with 4 additions and 4 deletions
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8
src/Makefile
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@ -328,7 +328,7 @@ endif
ifeq ($(pext),yes) ifeq ($(pext),yes)
CXXFLAGS += -DUSE_PEXT CXXFLAGS += -DUSE_PEXT
ifeq ($(comp),$(filter $(comp),gcc clang mingw)) ifeq ($(comp),$(filter $(comp),gcc clang mingw))
CXXFLAGS += -mbmi2 CXXFLAGS += -msse4 -mbmi2
endif endif
endif endif
@ -379,9 +379,9 @@ help:
@echo "" @echo ""
@echo "Supported archs:" @echo "Supported archs:"
@echo "" @echo ""
@echo "x86-64 > x86 64-bit" @echo "x86-64-bmi2 > x86 64-bit with pext support (also enables SSE4)"
@echo "x86-64-modern > x86 64-bit with popcnt support" @echo "x86-64-modern > x86 64-bit with popcnt support (also enables SSE3)"
@echo "x86-64-bmi2 > x86 64-bit with pext support" @echo "x86-64 > x86 64-bit generic"
@echo "x86-32 > x86 32-bit with SSE support" @echo "x86-32 > x86 32-bit with SSE support"
@echo "x86-32-old > x86 32-bit fall back for old hardware" @echo "x86-32-old > x86 32-bit fall back for old hardware"
@echo "ppc-64 > PPC 64-bit" @echo "ppc-64 > PPC 64-bit"