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

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 92709] "LLVM triggered Diagnostic Handler: unsupported call to function ldexpf in main" when starting race in stuntrally
Date: Wed, 04 Nov 2015 03:06:30 +0000	[thread overview]
Message-ID: <bug-92709-502-qbCAHullIZ@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-92709-502@http.bugs.freedesktop.org/>

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

--- Comment #7 from Matt Arsenault <arsenm2@gmail.com> ---
(In reply to Michel Dänzer from comment #6)
> (In reply to Matt Arsenault from comment #5)
> > It seems bizarre that an llvm intrinsic would ever be changed to something
> > involving a library call.
> 
> I think the exp2 -> ldexpf transform is rather questionable for us anyway,
> since we have a native exp2 instruction, isn't it? Maybe we just don't want
> to use the LibCallSimplifier pass? The comment at the top of
> SimplifyLibCalls.cpp kind of sounds like "this is not the pass you're
> looking for"...

We do want this. ldexp is a full rate instruction, and exp2 is a quarter rate
instruction.

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