[PATCH] D150074: InstCombine: Handle shrinking fneg used by fptrunc

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

In D150074#4329515 <https://reviews.llvm.org/D150074#4329515>, @foad wrote:

>> This would have regressed when the fsub special case was dropped
>
> What happened? Got a link to a patch?

fneg used to not exist and we had fsub -0, x = "fneg"


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https://reviews.llvm.org/D150074