[Umbrella] X86 specific builtins/intrinsics

[FantasqueX]

Currently, we only support one builtin/intrinsics _mm_clflush #1397, there are plenty of similar functions to implement. We support more AArch64 builtins/intrinsics than X86. They are good reference for implementing X86 builtins/intrinsics #589

[shrikardongre]

I would really like to take on this issue. Can i get assigned?

[FantasqueX]

I would really like to take on this issue. Can i get assigned?

@shrikardongre Great! I suggest picking a specific builtin which you would like to implement and create an issue for it, referring to this one. I can assign it to you.

[shrikardongre]

Yeah sure ,Thanks .

[shrikardongre]

if (BuiltinID == Builtin::BI__builtin_cpu_is)
llvm_unreachable("__builtin_cpu_is NYI");
if (BuiltinID == Builtin::BI__builtin_cpu_supports)
llvm_unreachable("__builtin_cpu_supports NYI");
if (BuiltinID == Builtin::BI__builtin_cpu_init)
llvm_unreachable("__builtin_cpu_init NYI");

Just curious why are these to be handled seperately ?
@FantasqueX

[bcardosolopes]

#1414 is related to this

[Icaro-Nunes]

@FantasqueX is there a priority for which builitin/intrinsics should be implemented? Is this this a good reference?

[FantasqueX]

@FantasqueX is there a priority for which builitin/intrinsics should be implemented? Is this this a good reference?

clangir/clang/lib/CodeGen/CGBuiltin.cpp

Line 15336 in 79d0d74

Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,

Original clang's implementation is a good reference. Imitating how clang deals with intrinsics is enough for us.