[PATCH] D50913: [FPEnv] Don't need copysign/fabs/fneg constrained intrinsics

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

I would really much rather have an fneg instruction than to deal with a constrained fneg On GPUs we have source modifiers, and it would be really helpful to preserve all of the side effect free properties of fneg so ti's easy to propagate all of the optimizations of fnegs through the constrained operations. Having the unnecessary complexity of the side effects to workaround this quirk of how the IR has been defined thus far would be unfortunate


Repository:
  rL LLVM

https://reviews.llvm.org/D50913