[llvm-bugs] [Bug 34924] Remove 'zero shift' guards from rotation patterns

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Dec 17 13:20:51 PST 2018


Sanjay Patel <spatel+llvm at rotateright.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #11 from Sanjay Patel <spatel+llvm at rotateright.com> ---
Should be fixed (at -O3) after:

Asm for x86-64 target is:

_rotl:                                  ## @rotl
        movl    %esi, %ecx
        movl    %edi, %eax
        roll    %cl, %eax

_rotr:                                  ## @rotr
        movl    %esi, %ecx
        movl    %edi, %eax
        rorl    %cl, %eax

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