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Enable BMI1 too when using BMI2 ARCH

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Adding BMI1 allows the compiler to use _blsr_u64
automatically (the advertised 0.3% speed gain).
I verified that the compiler does not use this
instruction with the -mbmi2 flag only. Also, all
processors supporting BMI2 is also supporting BMI1.

No functional change
This commit is contained in:
Jean-Francois Romang
2014-04-14 07:10:39 +02:00
committed by Marco Costalba
parent 7bce8831d3
commit 9073866491
1 changed files with 1 additions and 1 deletions
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2
src/Makefile
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@@ -293,7 +293,7 @@ endif
ifeq ($(pext),yes)
CXXFLAGS += -DUSE_PEXT
ifeq ($(comp),$(filter $(comp),gcc clang mingw))
CXXFLAGS += -mbmi2
CXXFLAGS += -mbmi -mbmi2
endif
endif