[LLVMdev] Other Intrinsics?

Jon Sargeant delta17 at cox.net
Tue Nov 27 09:50:03 PST 2007

 > > 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.

What is the criteria for adding an intrinsic or a built-in operation?
For example, could the 'frem' instruction be an intrinsic?  Could you 
remove it from LLVM entirely and make it an external function?  What 
distinguishes 'frem' from 'sin', 'pow', 'atan2', etc.?


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