[clang] f76adc2 - [docs] Add an initial (non-exhaustive) list of intrinsics that can be used in constant expressions

[Richard Smith via cfe-commits]

Thank you!

On Sun, 23 Aug 2020 at 02:55, Simon Pilgrim via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

>
> Author: Simon Pilgrim
> Date: 2020-08-23T10:55:14+01:00
> New Revision: f76adc2603f6cc466dd809142388ffb56a1c3e31
>
> URL:
> https://github.com/llvm/llvm-project/commit/f76adc2603f6cc466dd809142388ffb56a1c3e31
> DIFF:
> https://github.com/llvm/llvm-project/commit/f76adc2603f6cc466dd809142388ffb56a1c3e31.diff
>
> LOG: [docs] Add an initial (non-exhaustive) list of intrinsics that can be
> used in constant expressions
>
> As suggested by @rsmith on D86398 - we should try to document the
> intrinsics that can be used in constexpr
>
> Added:
>
>
> Modified:
>     clang/docs/LanguageExtensions.rst
>
> Removed:
>
>
>
>
> ################################################################################
> diff  --git a/clang/docs/LanguageExtensions.rst
> b/clang/docs/LanguageExtensions.rst
> index a431239f887b..970c75ffafee 100644
> --- a/clang/docs/LanguageExtensions.rst
> +++ b/clang/docs/LanguageExtensions.rst
> @@ -3603,3 +3603,76 @@ and alignment as the smallest basic type that can
> contain them. Types that are l
>  than 64 bits are handled in the same way as _int128 is handled; they are
> conceptually
>  treated as struct of register size chunks. They number of chunks are the
> smallest
>  number that can contain the types which does not necessarily mean a
> power-of-2 size.
> +
> +Intrinsics Support within Constant Expressions
> +==============================================
> +
> +The following builtin intrinsics can be used in constant expressions:
> +
> +* ``__builtin_bitreverse8``
> +* ``__builtin_bitreverse16``
> +* ``__builtin_bitreverse32``
> +* ``__builtin_bitreverse64``
> +* ``__builtin_bswap16``
> +* ``__builtin_bswap32``
> +* ``__builtin_bswap64``
> +* ``__builtin_clrsb``
> +* ``__builtin_clrsbl``
> +* ``__builtin_clrsbll``
> +* ``__builtin_clz``
> +* ``__builtin_clzl``
> +* ``__builtin_clzll``
> +* ``__builtin_clzs``
> +* ``__builtin_ctz``
> +* ``__builtin_ctzl``
> +* ``__builtin_ctzll``
> +* ``__builtin_ctzs``
> +* ``__builtin_ffs``
> +* ``__builtin_ffsl``
> +* ``__builtin_ffsll``
> +* ``__builtin_fpclassify``
> +* ``__builtin_inf``
> +* ``__builtin_isinf``
> +* ``__builtin_isinf_sign``
> +* ``__builtin_isfinite``
> +* ``__builtin_isnan``
> +* ``__builtin_isnormal``
> +* ``__builtin_nan``
> +* ``__builtin_nans``
> +* ``__builtin_parity``
> +* ``__builtin_parityl``
> +* ``__builtin_parityll``
> +* ``__builtin_popcount``
> +* ``__builtin_popcountl``
> +* ``__builtin_popcountll``
> +* ``__builtin_rotateleft8``
> +* ``__builtin_rotateleft16``
> +* ``__builtin_rotateleft32``
> +* ``__builtin_rotateleft64``
> +* ``__builtin_rotateright8``
> +* ``__builtin_rotateright16``
> +* ``__builtin_rotateright32``
> +* ``__builtin_rotateright64``
> +
> +The following x86-specific intrinsics can be used in constant expressions:
> +
> +* ``_bit_scan_forward``
> +* ``_bit_scan_reverse``
> +* ``__bsfd``
> +* ``__bsfq``
> +* ``__bsrd``
> +* ``__bsrq``
> +* ``__bswap``
> +* ``__bswapd``
> +* ``__bswap64``
> +* ``__bswapq``
> +* ``_castf32_u32``
> +* ``_castf64_u64``
> +* ``_castu32_f32``
> +* ``_castu64_f64``
> +* ``_mm_popcnt_u32``
> +* ``_mm_popcnt_u64``
> +* ``_popcnt32``
> +* ``_popcnt64``
> +* ``__popcntd``
> +* ``__popcntq``
> \ No newline at end of file
>
>
>
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