[PATCH][ARM][1/2] Add support for vcvt_f16_f32 and vcvt_f32_f16 NEON intrinsics

[Kyrylo Tkachov]

Hi all,

This patch adds the vcvt_f16_f32 and vcvt_f32_f16 NEON intrinsic
to arm_neon.h through the generator ML scripts and also adds the
built-ins to which the intrinsics will map to. The generator ML scripts
are updated and used to generate the relevant .texi documentation,
arm_neon.h and the tests in gcc.target/arm/neon .

The new intrinsics are guarded by checking the __ARM_FP predefine
as described in ACLE. The second bit of the macro defines
half-precision floating point support, so the intrinsics are guarded by:
#if ((__ARM_FP & 0x2) != 0)

In arm.c I had to add handling of half-precision floats
(and their vector forms) in quite a few places.
I hope I didn't miss any part out.

Testing arm-none-eabi on qemu showed no regressions.

Ok for trunk?

Thanks,
Kyrill

gcc/ChangeLog
2013-04-12  Kyrylo Tkachov  <kyrylo.tkac...@arm.com>

        * config/arm/arm.c (neon_builtin_type_mode): Add T_V4HF.
        (TB_DREG): Add T_V4HF.
        (v4hf_UP): New macro.
        (neon_itype): Add NEON_FLOAT_WIDEN, NEON_FLOAT_NARROW.
        (arm_init_neon_builtins): Handle NEON_FLOAT_WIDEN,
NEON_FLOAT_NARROW.
        Handle initialisation of V4HF. Adjust initialisation of reinterpret
        built-ins.
        (arm_expand_neon_builtin): Handle NEON_FLOAT_WIDEN,
NEON_FLOAT_NARROW.
        (arm_vector_mode_supported_p): Handle V4HF.
        (arm_mangle_map): Handle V4HFmode.
        * config/arm/arm.h (VALID_NEON_DREG_MODE): Add V4HF.
        * config/arm/arm_neon_builtins.def: Add entries for
        vcvtv4hfv4sf, vcvtv4sfv4hf.
        * config/arm/neon.md (neon_vcvtv4sfv4hf): New pattern.
        (neon_vcvtv4hfv4sf): Likewise.
        * config/arm/neon-gen.ml: Handle half-precision floating point
features.
        * config/arm/neon-testgen.ml: Handle Requires_FP_bit feature.
        * config/arm/arm_neon.h: Regenerate.
        * config/arm/neon.ml (type elts): Add F16.
        (type vectype): Add T_float16x4, T_floatHF.
        (type vecmode): Add V4HF.
        (string_of_mode): Move earlier in the file.
        (type features): Add Requires_FP_bit feature.
        (elt_width): Handle F16.
        (elt_class): Likewise.
        (elt_of_class_width): Likewise.
        (mode_of_elt_str): New function.
        (type_for_elt): Handle F16, fix error messages.
        (vectype_size): Handle T_float16x4.
        (vcvt_sh): New function.
        (ops): Add entries for vcvt_f16_f32, vcvt_f32_f16.
        (string_of_vectype): Handle T_floatHF, T_float16, T_float16x4.
        * doc/arm-neon-intrinsics.texi: Regenerate.


gcc/testsuite/ChangeLog
2013-04-12  Kyrylo Tkachov  <kyrylo.tkac...@arm.com>

        * gcc.target/arm/neon/vcvtf16_f32.c: New test. Generated.
        * gcc.target/arm/neon/vcvtf32_f16.c: Likewise.

neon-vcvt-intrinsics-temp.patch
Description: Binary data