[llvm-bugs] [Bug 34111] Compiler no longer optimizing a vector add+shuffle to identity to a horizontal add

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Sep 1 14:23:45 PDT 2017


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

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

--- Comment #7 from Sanjay Patel <spatel+llvm at rotateright.com> ---
Should be fixed with:

If horizontal ops are expected to be generated in ways other than this exact
example, I suspect we can still miss those optimizations. 

Ie, if we really care about horizontal ops, we should get a bigger picture of
the uses, so we can properly fix the problem.

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