[llvm-dev] [FPEnv] FNEG instruction

[Matt Arsenault via llvm-dev]

> On Aug 29, 2018, at 17:50, Cameron McInally via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Ping...
> 
> The current thinking is that FNEG(X) and FSUB(-0.0, X) are not the same operation when X is a NaN or 0. So, the xforms in question should only be valid under Fast-Math conditions. 
> 
> Is correcting this behavior something that the general LLVM population would like? If not, we can create constrained intrinsics for the FPEnv project.
> 
> Thanks again,
> Cameron


+1