http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39326
--- Comment #34 from Sergei Steshenko <sergstesh at yahoo dot com> 2013-03-07 17:13:42 UTC --- Somehow, with -O3 LLVM clang works a little bit faster than with -O2 - 54 minutes instead of 58 minutes, though this might be a random variation: " sergei@amdam2:~/gcc_bug> time ~/AFSWD/install/LLVM-3.2/binsh/clang -v gap_TlnLv4.c -O3 -c clang version 3.2 (tags/RELEASE_32/final) Target: i386-pc-linux-gnu Thread model: posix "/mnt/sdb5/qemu/20121021/LLVM-3.2/bin/clang" -cc1 -triple i386-pc-linux-gnu -emit-obj -disable-free -disable-llvm-verifier -main-file-name gap_TlnLv4.c -mrelocation-model static -fmath-errno -masm-verbose -mconstructor-aliases -target-cpu pentium4 -target-linker-version 2.22 -momit-leaf-frame-pointer -v -coverage-file /home/sergei/gcc_bug/gap_TlnLv4.o -resource-dir /mnt/sdb5/qemu/20121021/LLVM-3.2/bin/../lib/clang/3.2 -fmodule-cache-path /tmp/clang-module-cache -internal-isystem /usr/local/include -internal-isystem /mnt/sdb5/qemu/20121021/LLVM-3.2/bin/../lib/clang/3.2/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -fdebug-compilation-dir /home/sergei/gcc_bug -ferror-limit 19 -fmessage-length 182 -mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o gap_TlnLv4.o -x c gap_TlnLv4.c clang -cc1 version 3.2 based upon LLVM 3.2svn default target i386-pc-linux-gnu ignoring nonexistent directory "/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include /mnt/sdb5/qemu/20121021/LLVM-3.2/bin/../lib/clang/3.2/include /usr/include End of search list. real 54m18.212s user 52m56.062s sys 0m8.085s sergei@amdam2:~/gcc_bug> ". Memory consumption appears to be the same as with -O2.
