http://llvm.org/bugs/show_bug.cgi?id=14651
Bug #: 14651
Summary: CLANG Compilation 4x Slower Than GCC
Product: clang
Version: 3.1
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Driver
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 9740
--> http://llvm.org/bugs/attachment.cgi?id=9740
pan.* sources
Compiling 500k of auto-generated source code is approximately 4x slower with
Clang compared to GCC.
ebg@taiyo(13)$ time /usr/local/gcc/bin/gcc -DHC4 -DSAFETY -DNOREDUCE -DNFAIR=3
-O2 -o files pan.c
real 0m41.708s
user 0m39.156s
sys 0m1.375s
ebg@taiyo(14)$ time clang -DHC4 -DSAFETY -DNOREDUCE -DNFAIR=3 -O2 -o files
pan.c
real 3m49.014s
user 3m41.081s
sys 0m5.819s
ebg@taiyo(56)$ clang -v
Apple clang version 4.0 (tags/Apple/clang-421.0.60) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix
ebg@taiyo(57)$ /usr/local/gcc/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/usr/local/gcc/bin/gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc/libexec/gcc/x86_64-apple-darwin10.7.0/4.6.0/lto-wrapper
Target: x86_64-apple-darwin10.7.0
Configured with: ./configure --prefix=/usr/local/gcc --enable-languages='c c++'
--enable-lto --with-gmp=/usr/local/gcc --with-mpfr=/usr/local/gcc
--with-mpc=/usr/local/gcc
Thread model: posix
gcc version 4.6.0 (GCC)
See http://pastebin.com/bmPmBiQJ for 'clang -ftime-report ...'
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