[llvm-bugs] [Bug 37387] MSVC rotate intrinsics don't (just) generate rotates on x86-64

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Nov 26 06:35:44 PST 2018


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

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

--- Comment #17 from Sanjay Patel <spatel+llvm at rotateright.com> ---
(In reply to simonas+llvm.org from comment #15)
> It seems that Clang still codegens the old sequence for `_rot{l,r}` builtins
> rather than these new LLVM intrinsics, as can be seen in
> lib/CodeGen/CGBuiltin.cpp at lines 1822-1860.

I don't see any bot failures caused by the clang change this time, so should be
fixed with:

Note that there is still ongoing work to optimize/canonicalize funnel-shift and
associated patterns. See related bugs to track those.

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