[llvm-dev] [FPEnv] FNEG instruction

[Sanjay Patel via llvm-dev]

On Tue, Oct 2, 2018 at 10:09 AM Kevin Neal <Kevin.Neal at sas.com> wrote:

> If we don’t have constrained intrinsics for some of the fp math
> instructions then aren’t we risking non-strict optimizations?
>

As I said in my last reply, I haven't followed the constrained work, so I
don't know...but I'm curious.
What is the optimized LLVM IR for this C source assuming the frontend
recognizes/respects the pragma:

#pragma STDC FENV_ACCESS ON

float negneg(float x, float y) {
  return (-x) * (-y);
}
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