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Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."


On 12/31/06, Daniel Berlin <dberlin@dberlin.org> wrote:
...
> I added -fwrapv to the Dec30 run of SPEC at
> http://www.suse.de/~gcctest/SPEC/CFP/sb-vangelis-head-64/recent.html
> and
> http://www.suse.de/~gcctest/SPEC/CINT/sb-vangelis-head-64/recent.html

Note the distinct drop in performance across almost all the benchmarks
on Dec 30, including popular programs like bzip2 and gzip.

Also, this is only on x86 - other targets that benefit more from software pipelinine/modulo scheduling may suffer even more than x86, especially on the FP side. -- #pragma ident "Seongbae Park, compiler, http://seongbae.blogspot.com";


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