[llvm-bugs] [Bug 35601] Missed optimization in math expression: sqrt(pow(a, 2.0)) == |a|

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Dec 10 09:01:12 PST 2017


https://bugs.llvm.org/show_bug.cgi?id=35601

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

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

--- Comment #5 from Sanjay Patel <spatel+llvm at rotateright.com> ---
Should be fixed after:
https://reviews.llvm.org/rL320309
https://reviews.llvm.org/rL320310

Note that there's a sibling bug for pow(x, -1.0) that is still alive (I marked
it with a 'FIXME' comment in the source).

Also, we should be getting these folds with vector types too, but I suspect
we're missing a bunch of those cases.

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