[llvm-bugs] [Bug 42152] Vectorized code degrades performance 3x swicthing from SSE4.1 to SSE4.2

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Oct 30 06:46:34 PDT 2019


Simon Pilgrim <llvm-dev at redking.me.uk> changed:

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

--- Comment #4 from Simon Pilgrim <llvm-dev at redking.me.uk> ---
This appears to be fixed in trunk by a mixture of better sum-reduction costs
(all the way down to SSE2) and enabling experimental widening by default.

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