Hi! This small change enables FP reassociation for AVX2 processors. This gives ~+1.5% in performance geomean for spec2006FP tests.
Bootstrapped/regtested on x86_64-linux, ok for trunk? 2013-02-14 Igor Zamyatin <igor.zamya...@intel.com> * config/i386/i386.c (initial_ix86_tune_features): Turn on fp reassociation for avx2 targets. diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index caf4894..cb84866 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -2021,7 +2021,7 @@ static unsigned int initial_ix86_tune_features[X86_TUNE_LAST] = { /* X86_TUNE_REASSOC_FP_TO_PARALLEL: Try to produce parallel computations during reassociation of fp computation. */ - m_ATOM, + m_ATOM | m_HASWELL, /* X86_TUNE_GENERAL_REGS_SSE_SPILL: Try to spill general regs to SSE regs instead of memory. */