[llvm-bugs] [Bug 16257] fmul of undef ConstantExpr not folded to undef

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=16257

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |spatel+llvm at rotateright.com
             Status|NEW                         |RESOLVED
 Fixed By Commit(s)|                            |327058
         Resolution|---                         |FIXED

--- Comment #4 from Sanjay Patel <spatel+llvm at rotateright.com> ---
There was a good discussion about the semantics here:
http://lists.llvm.org/pipermail/llvm-dev/2014-August/076169.html
http://lists.llvm.org/pipermail/llvm-dev/2014-September/076326.html

...but I'm not sure any code changes resulted from that.

I stumbled into FP undef again recently (without finding the above threads or
this bug):

http://lists.llvm.org/pipermail/llvm-dev/2018-February/121444.html
http://lists.llvm.org/pipermail/llvm-dev/2018-March/121481.html

And I'm fixing the LangRef and code based on that thread:

https://reviews.llvm.org/D44258
https://reviews.llvm.org/D44216
https://reviews.llvm.org/D44308
https://reviews.llvm.org/D44318

This particular example should be fixed with:
https://reviews.llvm.org/rL327058

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