[LLVMdev] Documentation of fmuladd intrinsic

Lang Hames lhames at gmail.com
Wed Jan 16 16:02:55 PST 2013

Hi Andrew,

That seems like a useful clarification. I've updated the docs with your
suggested text (with some tweaks) in r172680.

Thanks for the suggestion.


On Mon, Jan 14, 2013 at 5:25 AM, Andrew Booker <Andrew.Booker at arm.com>wrote:

> Thanks for all the replies - it pretty much confirmed what I think I'd
> worked out about how fmuladd is supposed to behave.
> But my initial query wasn't asking what fmuladd did - it was asking for
> the documentation about it to be clarified. Can I suggest that the
> Overview section for fmuladd is changed to say the following (the key
> point being the removal of the word "legal" in the description, to
> avoid confusion with whether the optimisation is legal from the point
> of view of the source language):
> The llvm.fmuladd.* intrinsic functions represent multiply-add
> expressions that can be fused if the code generator determines that the
> target instruction set has support for a fused expression, and that its
> use would be efficient.
> Andrew
> --
> Andrew Booker, Staff Software Engineer
> Media Processing Division
> ARM Ltd, 110 Fulbourn Road, Cambridge CB1 9NJ, UK
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