[LLVMbugs] [Bug 17305] missed opportunity for associative FP math in summation reduction (pairwise summation)

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=17305

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

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

--- Comment #4 from Sanjay Patel <spatel+llvm at rotateright.com> ---
Reassociation is now done in the machine combiner pass so it can be
register-pressure-aware. 

The code produced after:
http://llvm.org/viewvc/llvm-project?view=revision&revision=241871

...is equivalent to that in comment 2.

It's still not the perfect binary tree of ops because that would require a
potentially big leap in compile time, but this is probably as good as it gets.

Other relevant commits:
http://llvm.org/viewvc/llvm-project?view=revision&revision=239486
http://llvm.org/viewvc/llvm-project?view=revision&revision=240361
http://llvm.org/viewvc/llvm-project?view=revision&revision=241515

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