re PR target/66144 (vector element operator produces very bad code)

re PR target/66144 (vector element operator produces very bad code)

[gcc]
2017-02-06  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/66144
	* config/rs6000/vector.md (vcond<mode><mode>): Allow the true and
	false values to be constant vectors with all 0 or all 1 bits set.
	(vcondu<mode><mode>): Likewise.
	* config/rs6000/predicates.md (vector_int_reg_or_same_bit): New
	predicate.
	(fpmask_comparison_operator): Update comment.
	(vecint_comparison_operator): New predicate.
	* config/rs6000/rs6000.c (rs6000_emit_vector_cond_expr): Optimize
	vector conditionals when the true and false values are constant
	vectors with all 0 bits or all 1 bits set.

[gcc/testsuite]
2017-02-06  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/66144
	* gcc.target/powerpc/pr66144-1.c: New test.
	* gcc.target/powerpc/pr66144-2.c: Likewise.
	* gcc.target/powerpc/pr66144-3.c: Likewise.

From-SVN: r245222