[PATCH 16/17][ARM] Add tests for VFP FP16 ACLE instrinsics.

[Matthew Wahab]

Support for using the half-precision floating point operations added by
the ARMv8.2-A FP16 extension is based on the macros and intrinsics added
to the ACLE for the extension.

This patch adds executable tests for the ACLE scalar (floating point)
intrinsics to the advsimd-intrinsics testsuite. The tests were written
by Jiong Wang.

In some tests, there are unavoidable differences in precision when
calculating the actual and the expected results of an FP16 operation. A
new support function CHECK_FP_BIAS is used so that these tests can check
for an acceptable margin of error. In these tests, the tolerance is
given as the absolute integer difference between the bitvectors of the
expected and the actual results.

Tested the series for arm-none-linux-gnueabihf with native bootstrap and
make check and for arm-none-eabi and armeb-none-eabi with make check on
an ARMv8.2-A emulator. Also tested for aarch64-none-elf with the
advsimd-intrinsics testsuite using an ARMv8.2-A emulator.

Ok for trunk?
Matthew

testsuite/
2016-05-17  Jiong Wang  <jiong.wang@arm.com>
	    Matthew Wahab  <matthew.wahab@arm.com>

	* gcc.target/aarch64/advsimd-intrinsics/arm-neon-ref.h
	(CHECK_FP_BIAS): New.
	* gcc.target/aarch64/advsimd-intrinsics/vabsh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vaddh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvtah_s32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvtah_u32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvth_f16_s32_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvth_f16_u32_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvth_n_f16_s32_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvth_n_f16_u32_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvth_n_s32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvth_n_u32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvth_s32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvth_u32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvtmh_s32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvtmh_u32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvtnh_s32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvtnh_u32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvtph_s32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vcvtph_u32_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vdivh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vfmah_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vfmsh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vmaxnmh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vminnmh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vmulh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vnegh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vrndah_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vrndh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vrndih_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vrndmh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vrndnh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vrndph_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vrndxh_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vsqrth_f16_1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/vsubh_f16_1.c: New.

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