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Added gcc lto (Link Time Optimization) option

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Just by adding the -flto option to CXXFLAGS link command
we can gain a few percent in speed.

On a Core i5-2500 (3300 Mhz, Sandy Bridge):

64 bit download version:

Without -flto: 1597151 n/s
With -flto : 1659664 n/s

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Tom Vijlbrief 2011-10-06 18:25:36 +02:00 • committed by Marco Costalba
parent 3141490374
commit 09b5949cd2
1 changed files with 10 additions and 0 deletions
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10
src/Makefile
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@ -52,6 +52,7 @@ OBJS = benchmark.o bitbase.o bitboard.o book.o endgame.o evaluate.o main.o \
# bsfq = no/yes --- -DUSE_BSFQ --- Use bsfq x86_64 asm-instruction # bsfq = no/yes --- -DUSE_BSFQ --- Use bsfq x86_64 asm-instruction
# --- (Works only with GCC and ICC 64-bit) # --- (Works only with GCC and ICC 64-bit)
# popcnt = no/yes --- -DUSE_POPCNT --- Use popcnt x86_64 asm-instruction # popcnt = no/yes --- -DUSE_POPCNT --- Use popcnt x86_64 asm-instruction
# lto = no/yes --- -flto --- gcc Link Time Optimization
# #
# Note that Makefile is space sensitive, so when adding new architectures # Note that Makefile is space sensitive, so when adding new architectures
# or modifying existing flags, you have to make sure there are no extra spaces # or modifying existing flags, you have to make sure there are no extra spaces
@ -123,6 +124,7 @@ ifeq ($(ARCH),x86-64-modern)
prefetch = yes prefetch = yes
bsfq = yes bsfq = yes
popcnt = yes popcnt = yes
lto = yes
endif endif
ifeq ($(ARCH),x86-32) ifeq ($(ARCH),x86-32)
@ -311,6 +313,14 @@ ifeq ($(popcnt),yes)
CXXFLAGS += -DUSE_POPCNT CXXFLAGS += -DUSE_POPCNT
endif endif
### 3.11 lto.
### Note that this is a mix of compile and link time options
### because the lto link phase needs access to the optimization flags
ifeq ($(lto),yes)
CXXFLAGS += -flto
LDFLAGS += $(CXXFLAGS) -static
endif
### ========================================================================== ### ==========================================================================
### Section 4. Public targets ### Section 4. Public targets
### ========================================================================== ### ==========================================================================