[Bug 92709] "LLVM triggered Diagnostic Handler: unsupported call to function ldexpf in main" when starting race in stuntrally

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92709

--- Comment #2 from Matt Arsenault <arsenm2 at gmail.com> ---
(In reply to Michel Dänzer from comment #1)
> This happens since Mesa commit d72a26ec ("radeonsi: don't emit AMDGPU
> intrinsics for EX2, ROUND, TRUNC") because the LLVM function
> LibCallSimplifier::optimizeExp2() replaces the llvm.exp2.f32 call (which
> could be handled by the AMDGPU backend AFAICT) with an ldexpf one.

This is one of those annoying cases where ldexp doesn't have an equivalent
generic ISD node. We should probably add one and use it for the libcall and
handle it like most of the other math LibFuncs.

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