Turning off X86_TUNE_USE_VECTOR_CONVERTS uses cvtss2sd instead of
unpcklps+cvtps2pd, which is better for some recent intel micro arch
such as westmere and sandybridge. So turn it off for m_GENERIC and
m_CORE_ALL.
regression and bootstrap ok. ok for 4.8 branch?
Index: config/i386/i386.c
===================================================================
--- config/i386/i386.c (revision 201675)
+++ config/i386/i386.c (working copy)
@@ -1995,7 +1995,7 @@ static unsigned int initial_ix86_tune_fe
/* X86_TUNE_USE_VECTOR_FP_CONVERTS: Prefer vector packed SSE conversion
from FP to FP. */
- m_CORE_ALL | m_AMDFAM10 | m_GENERIC,
+ m_AMDFAM10,
/* X86_TUNE_USE_VECTOR_CONVERTS: Prefer vector packed SSE conversion
from integer to FP. */
