llvm dev - Apr 2018 - Why does Clang use GCCBuiltInFunctions? How can intrinsics that don't depend on GCC be added?

http://llvm.org/doxygen/namespacellvm_1_1Intrinsic.html#a441f366e90feb68d310546c271bcd31e


I noticed that there are a lot of intrinsice in
`include/llvm/IR/Intrinsics*.td` that reference GCCBultIn, and looking at
the functions they're referencing it seems to be based on things already
built into GCC. Why is it done this way instead of just building them from
scratch (or importing the functions themselves) instead of depending on
gcc? Is building target-specific intrinsics from scratch problematic?

-- 
Ahmed Samara
PhD Student Computer Engineering
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It doesn't depend on GCC, it's just a way to provide a name for the 
intrinsic.

-Krzysztof

On 4/9/2018 11:13 AM, Ahmed Samara via llvm-dev wrote:
>
http://llvm.org/doxygen/namespacellvm_1_1Intrinsic.html#a441f366e90feb68d310546c271bcd31e
> 
> 
> I noticed that there are a lot of intrinsice in 
> `include/llvm/IR/Intrinsics*.td` that reference GCCBultIn, and looking 
> at the functions they're referencing it seems to be based on things 
> already built into GCC. Why is it done this way instead of just building 
> them from scratch (or importing the functions themselves) instead of 
> depending on gcc? Is building target-specific intrinsics from scratch 
> problematic?
> 
> -- 
> Ahmed Samara
> PhD Student Computer Engineering
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
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