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Increase optimization level of Clang

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Set optimization level to 4 and get a 2.564% faster binary:

Stockfish (Clang, Level 4) bench:
$ make build ARCH=osx-x86-64 COMP=clang
(Clang does not support PGO)
Average of 4 trials:
Total time (ms): 5137.5
Nodes searched: 5631135
Nodes/second: 1096084.5

Stockfish (Clang, Level 3) bench:
$ make build ARCH=osx-x86-64 COMP=clang
(Clang does not support PGO)
Average of 4 trials:
Total time (ms): 5269.25
Nodes searched: 5631135
Nodes/second: 1068679.25

Stockfish (GCC, PGO) bench:
$ make profile-build ARCH=osx-x86-64
Average of 4 trials:
Total time (ms): 5286
Nodes searched: 5631135
Nodes/second: 1065292.25

Suggestion and performance tests by Daylen Yang.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-04-29 23:11:23 +01:00
parent 39c08c17c5
commit 96f4ab48d8
1 changed files with 1 additions and 1 deletions
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2
src/Makefile
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@ -270,7 +270,7 @@ ifeq ($(optimize),yes)
endif endif
ifeq ($(comp),clang) ifeq ($(comp),clang)
CXXFLAGS += -O3 CXXFLAGS += -O4
ifeq ($(os),osx) ifeq ($(os),osx)
ifeq ($(arch),i386) ifeq ($(arch),i386)