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. */
