Hi!

On 2023-05-06T17:04:57+0100, "Roger Sayle" <roger@nextmovesoftware.com> wrote:
> This patch adds support for (a pair of) bit reversal intrinsics
> __builtin_nvptx_brev and __builtin_nvptx_brevll which perform 32-bit
> and 64-bit bit reversal (using nvptx's brev instruction) matching
> the __brev and __brevll instrinsics provided by NVidia's nvcc compiler.
> https://docs.nvidia.com/cuda/cuda-math-api/group__CUDA__MATH__INTRINSIC__INT.html

(That got pushed in commit c09471fbc7588db2480f036aa56a2403d3c03ae5
"nvptx: Add suppport for __builtin_nvptx_brev instrinsic".)

> --- a/gcc/doc/extend.texi
> +++ b/gcc/doc/extend.texi

> @@ -17941,6 +17942,20 @@ Enable global interrupt.
>  Disable global interrupt.
>  @enddefbuiltin
>
> +@node Nvidia PTX Built-in Functions
> +@subsection Nvidia PTX Built-in Functions
> +
> +These built-in functions are available for the Nvidia PTX target:
> +
> +@defbuiltin{unsigned int __builtin_nvptx_brev (unsigned int @var{x})}
> +Reverse the bit order of a 32-bit unsigned integer.
> +Disable global interrupt.

Pushed to master branch commit 4450984d0a18cd4e352d396231ba2c457d20feea
"nvptx: Fix copy'n'paste-o in '__builtin_nvptx_brev' description", see
attached.

> +@enddefbuiltin
> +
> +@defbuiltin{unsigned long long __builtin_nvptx_brevll (unsigned long long @var{x})}
> +Reverse the bit order of a 64-bit unsigned integer.
> +@enddefbuiltin
> +
>  @node Basic PowerPC Built-in Functions
>  @subsection Basic PowerPC Built-in Functions


Grüße
 Thomas


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