* i386.h (ix86_tune_indices): Add X86_USE_VECTOR_CONVERTS.
	(TARGET_USE_VECTOR_CONVERTS): New.
	* i386.md: New post-reload splitters for converting SF to DF and DF to
	SF.
	(floatsi* expander): Special case vector conversions.
	(floatsisf2_mixed_vector, floatsisf2_sse_vector_nointernunit,
	floatsisf2_sse_vector_internunit, floatsisf2_sse_vector,
	floatsidf2_mixed_vector, floatsidf2_sse_vector): New.
	(floatsisf2_mixed, floatsisf2_sse, floatsidf2_mixed, floatsidf2_sse):
	Disable when doing vector converts.
	(floatsi<mode>2_i387): Disable when
	* sse.md (vec_dupv2df): Export.
	* i386.c (ix86_tune_features): Enable SSE conversions.

Co-Authored-By: Dwarakanath Rajagopal <dwarak.rajagopal@amd.com>

From-SVN: r128301