[PATCH] D61916: Teach InstSimplify transform -X + X --> 0.0 about unary FNeg
Sanjay Patel via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed May 15 05:51:33 PDT 2019
spatel added a comment.
In D61916#1502826 <https://reviews.llvm.org/D61916#1502826>, @kpn wrote:
> Is this an allowed transform?
>
> If we transform "y = -x + x;" into "y = 0;" then won't that eliminate a trap? Is that allowed?
We're not dealing with constrained ops in this transform, so assume no traps/exceptions.
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