[LLVMdev] Best way for JIT to query whether llvm.fma.* is fast?

Jingyue Wu jingyue at google.com
Wed Dec 10 12:55:31 PST 2014

Does TargetLowering::isFMAFasterThanFMulAndFAdd (


On Wed, Dec 10, 2014 at 12:48 PM, Robison, Arch <arch.robison at intel.com>

>  For the Julia language JIT, we’d like be able to tell whether the
> llvm.fma.* intrinsic has hardware support.  What’s the best way to  query
> LLVM (JIT) for this information?
> The information would be used in situations where the user wants to use
> different algorithms depending on whether FMA hardware is present or not.
> - Arch D. Robison
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