[LLVMdev] Other Intrinsics?

[Chris Lattner]

On Tue, 27 Nov 2007, Jon Sargeant wrote:
> Do you have plans to add other intrinsics?  I'm curious as to why there
> is an llvm.sin intrinsic and an llvm.cos intrinsic, but no llvm.atan
> intrinsic.  Why is there an llvm.pow intrinsic but no llvm.log
> intrinsic?

Intrinsics get added on demand.  Generally there has to be a good reason 
to add them.  llvm.sin was implemented (for example) to allow generation 
of code that uses vector sin operations.

To be honest, I'm not sure I understand why it exists anymore.  Maybe Dan 
can comment on that.

> Also, have you thought about integer intrinsics like
> multiprecision multiply (u32xu32->u64) and multiprecision divide
> (u64/u32->(dividend:u32,remainder:u32))?

We don't need anything fancy for these, see this recent thread:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2007-November/011435.html
http://lists.cs.uiuc.edu/pipermail/llvmdev/2007-November/011440.html

-Chris

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