re PR target/91498 (STV change in r274481 causes 300.twolf regression on Haswell)

re PR target/91498 (STV change in r274481 causes 300.twolf regression on Haswell)

2019-08-20  Richard Biener  <rguenther@suse.de>

	PR target/91498
	* config/i386/i386-features.c (general_scalar_chain::convert_op):
	Use (vec_merge (vec_duplicate..)) style vector from scalar move.
	(convert_scalars_to_vector): Add timode_p parameter and use it
	to guard TImode-only operation.
	(pass_stv::gate): Adjust so STV runs twice for TARGET_64BIT.
	(pass_stv::execute): Pass down timode_p.

	* gcc.target/i386/minmax-7.c: New testcase.

From-SVN: r274694