trying to generate a simple inline asm

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1

I'm trying to just emit simple inline assembler (no constraints, inputs, etc.)

Can anyone point me to an example of this..?

This is corresponding to:

   __asm__ ("mfc1 $4,$f12");

This is what I tried but it's not correct.

       std::vector<llvm::Type *> AsmArgTypes;
       llvm::FunctionType *AsmFTy =
llvm::FunctionType::get(Type::getVoidTy(FStub->getContext()),
                                 AsmArgTypes, false);
       llvm::InlineAsm *IA =
         llvm::InlineAsm::get(AsmFTy, "mfc1 $$4,$$f12", "", true,
                              /* IsAlignStack */ false,
                              llvm::InlineAsm::AD_Intel);
       CallInst::Create(IA, BB);

Probably something stupid I'm doing. I'm debugging now but maybe someone knows the answer.

TIA.

Reed

2

I'm trying to just emit simple inline assembler (no constraints, inputs,
etc.)

Can anyone point me to an example of this..?

C++ backend is your friend here.

3

That's where I'm looking. Unfortunately they are processing the general case so it's a lot of information to dig though.

I'm working on it.

4

I was close the first time. I derived this from the general clang version and I guess you need to include the argument list, even though it's null. Too many things to do to deep dive into all of that code right now.

       std::vector<llvm::Value*> AsmArgs;

       CallInst::Create(IA, AsmArgs, "", BB);