gcc/

	gcc/
	Backport from trunk r235402, r235403.
	2016-04-25  Michael Collison  <michael.collison@linaro.org>

	* config/arm/neon.md (widen_<us>sum<mode>): New patterns where
	mode is VQI to improve mixed mode vectorization.
	* config/arm/neon.md (vec_sel_widen_ssum_lo<VQI:mode><VW:mode>3): New
	define_insn to match low half of signed vaddw.
	* config/arm/neon.md (vec_sel_widen_ssum_hi<VQI:mode><VW:mode>3): New
	define_insn to match high half of signed vaddw.
	* config/arm/neon.md (vec_sel_widen_usum_lo<VQI:mode><VW:mode>3): New
	define_insn to match low half of unsigned vaddw.
	* config/arm/neon.md (vec_sel_widen_usum_hi<VQI:mode><VW:mode>3): New
	define_insn to match high half of unsigned vaddw.
	* config/arm/arm.c (arm_simd_vect_par_cnst_half): New function.
	(arm_simd_check_vect_par_cnst_half_p): Likewise.
	* config/arm/arm-protos.h (arm_simd_vect_par_cnst_half): Prototype
	for new function.
	(arm_simd_check_vect_par_cnst_half_p): Likewise.
	* config/arm/predicates.md (vect_par_constant_high): Support
	big endian and simplify by calling
	arm_simd_check_vect_par_cnst_half
	(vect_par_constant_low): Likewise.

	gcc/testsuite/
	Backport from trunk r235402.
	2016-04-25  Michael Collison <michael.collison@arm.com>

	* testsuite/gcc.target/arm/neon-vaddws16.c: New test.
	* testsuite/gcc.target/arm/neon-vaddws32.c: New test.
	* testsuite/gcc.target/arm/neon-vaddwu16.c: New test.
	* testsuite/gcc.target/arm/neon-vaddwu32.c: New test.
	* testsuite/gcc.target/arm/neon-vaddwu8.c: New test.
	* testsuite/lib/target-supports.exp
	(check_effective_target_vect_widen_sum_hi_to_si_pattern): Indicate
	that arm neon support vector widen sum of HImode TO SImode.

Change-Id: I73e392d5089153973547e78cb918f3bf8e5594d0