gcc/ChangeLog:

2016-01-15  Christophe Lyon  <christophe.lyon@linaro.org>

	PR target/68620
	* config/arm/arm.c (neon_valid_immediate): Handle FP16 vectors.
	* config/arm/arm_neon.h (__arm_lane): New helper macro.
	(vget_lane_f16): Handle big-endian.
	(vgetq_lane_f16): Likewise.
	(vset_lane_f16): Likewise.
	(vsetq_lane_f16): Likewise.
	* config/arm/iterators.md (VQXMOV): Add V8HF.
	(VDQ): Add V4HF and V8HF.
	(V_reg): Handle V4HF and V8HF.
	(Is_float_mode): Likewise.
	* config/arm/neon.md (movv4hf, movv8hf, neon_vdup_nv4hf,
	neon_vdup_nv8hf): New patterns.
	(vec_set<mode>_internal, neon_vld1_dup<mode>): Use VD_LANE iterator.
	(neon_vld1_dup<mode>): Use VQ2 iterator.
	* doc/sourcebuild.texi (arm_fp_ok, arm_fp): Add documentation.

gcc/testsuite/ChangeLog:

2016-01-15  Christophe Lyon  <christophe.lyon@linaro.org>

	PR target/68620
	* gcc.target/arm/pr68620.c: New test.
	* lib/target-supports.exp
	(check_effective_target_arm_fp_ok_nocache)
	(check_effective_target_arm_fp_ok, add_options_for_arm_fp): New.