[Issue 6829] Unsigned rotate standard function in Phobos

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http://d.puremagic.com/issues/show_bug.cgi?id=6829



--- Comment #17 from bearophile_hugs at eml.cc 2013-07-10 09:29:51 PDT ---
(In reply to comment #15)

> But to give you a comparison.
> 
> // LDC
> 
> __D5temp210__T3rolThZ3rolFNaNbNfxhxkZh:
>     pushl   %esi
>     movzbl  8(%esp), %edx
>     movb    %al, %cl
>     movl    %edx, %esi
>     shll    %cl, %esi
>     movl    $8, %ecx
>     subl    %eax, %ecx
>     shrl    %cl, %edx
>     orl %esi, %edx
>     movzbl  %dl, %eax
>     popl    %esi
>     ret $4
> 
> vs.
> 
> // GDC
> 
> __D5temp210__T3rolThZ3rolFNaNbNfxhxkZh:
>     movl    %edi, %eax
>     movl    %esi, %ecx
>     rolb    %cl, %al
>     ret

I have asked in the LLVM IRC channel, and it seems a limit/problem of the llvm
back-end. So maybe it's worth writing an LLVM enhancement request.

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