[LLVMdev] Which transform passes to apply?

Josh Klontz josh.klontz at gmail.com
Tue Dec 4 17:15:03 PST 2012

Duncan Sands wrote
> Hi Josh,
> instcombine, however this transform is only correct if you are adding -0.0 
> so you won't get it without "fast math", and in 3.2 I think it will only
> be 
> done by codegen (llc).  The situation should be better in 3.3 since a
> bunch 
> of fast-math support started going in to the IR level transforms. 
> ...
> Please open a bug report since even in mainline this transform isn't done
> yet
> (as fast-math support at the IR level only just got going).
> Ciao, Duncan.

Filed under http://llvm.org/bugs/show_bug.cgi?id=14513. The -0.0 trick did
the job in my case. Thanks again!

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