On Wed, Apr 1, 2015 at 5:18 PM, Jeffrey Walton <noloa...@gmail.com> wrote:
> Hi Everyone, > > I just downloaded and built Clang 3.6. It appears performance has > dropped considerably from Clang 3.2 through 3.5 (I've been > building/using it for that long). > > Is there anything obvious I am missing that might affect the > performance between 3.5 and 3.6? Like is something enabled that used > to be disabled or missing? > > Otherwise, below is what a typical compiler invocation looks like. In > the past, it performed fine. Does it set off any red flags for anyone? > > For completeness, I'm trying to run self tests under the sanitizers. > I'm interested in the dynamic analysis at this point, and not static > analysis provided by ccc-analyze and friends. > Interesting. Could you share the performance numbers, and try to figure out which specific sanitizer is causing a problem (i.e. try to compare just -fsanitize=address, and then various flavors of -fsanitize=undefined one by one: -fsanitize=shift, -fsanitize=null etc.). We are not aware of known performance degradation under sanitizers in 3.6 release. > > Thanks in advance. > > ==================== > > $ make static > /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -fsanitize=address > -fsanitize=undefined -Wall -Wno-tautological-compare -Wno-unused-value > -Wno-unused-variable -Wno-unused-parameter -Wno-unused-function > -DCRYPTOPP_DISABLE_ASM -pipe -c 3way.cpp > /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -fsanitize=address > -fsanitize=undefined -Wall -Wno-tautological-compare -Wno-unused-value > -Wno-unused-variable -Wno-unused-parameter -Wno-unused-function > -DCRYPTOPP_DISABLE_ASM -pipe -c adler32.cpp > ... > _______________________________________________ > cfe-users mailing list > cfe-users@cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-users > -- Alexey Samsonov vonos...@gmail.com
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