search for: r172680

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2013 Jan 14
0
[LLVMdev] Documentation of fmuladd intrinsic
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
2013 Jan 11
2
[LLVMdev] Documentation of fmuladd intrinsic
The fmuladd intrinsic is described as saying that a multiply and addition sequence can be fused into an fma instruction "if the code generator determines that the fused expression would be legal and efficient". (http://llvm.org/docs/LangRef.html#llvm-fma-intrinsic) I've spent a bit of time puzzling over how a code generator is supposed to know if it's legal to generate an fma