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2014-07-21 13:13 GMT+08:00 Pengfei Yuan <0xcool...@gmail.com>: > Hi, > > This patch tunes optimization options based on profile data: > * Disable PGO options if profile is not available or empty. > * Optimize for size if profile is available but empty. > > Here is an experiment on Firefox PGO build: > > CPU Intel Core i7-4770 > RAM 32 GB > OS Debian sid amd64 > Firefox source mozilla-central, changeset 4bafe35cfb65 > Compiler GCC 4.9.2 20140721 (prerelease) > > Result: > > Size of libxul.so | Octane benchmark score > PGO w/o this patch 67206232 32440.4 +/- 0.35% > PGO w/ this patch 66604312 32765.8 +/- 0.56% > > With this patch, the size of PGO-built libxul.so decreases by 0.9% and the > performance improves slightly. > > Regards, > > Yuan Pengfei > Peking University
gcc.patch
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