http://llvm.org/bugs/show_bug.cgi?id=20004
Bug ID: 20004
Summary: Performance regression when LTO is enabled
Product: clang
Version: 3.4
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Without LTO:
clang PerformanceTest.cpp dsp.cpp -std=c++11 -ffast-math -O3 -o PerformanceTest
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.2.0
Thread model: posix
Iterations: 955
C results: 100,043,846 shorts per second.
With LTO:
clang PerformanceTest.cpp dsp.cpp -std=c++11 -ffast-math -flto -O3 -o
PerformanceTest
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.2.0
Thread model: posix
Iterations: 586
C results: 61,349,033 shorts per second.
Code can be downloaded from here:
https://gist.github.com/learnopengles/004ff4eee75057ca006c
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