search for: llvm_ptrptr_ty

On Mon, 5 Feb 2007, Dan Gohman wrote: > LLVM knows what all the types of the intrinsic functions are; I thought, > why are users (including llvm-gcc...) required to duplicate all this > information in order to use them? I mean in order to call > getOrInsertFunction to get declarations for them. That is an excellent question! :) In the bad old days, we used to allow intrinsics

...lvm_i64_ty : LLVMIntegerType<i64, 64>; def llvm_float_ty : LLVMType<f32, "Type::FloatTyID">; def llvm_double_ty : LLVMType<f64, "Type::DoubleTyID">; -def llvm_ptr_ty : LLVMType<iPTR, "Type::PointerTyID">; // i8* -def llvm_ptrptr_ty : LLVMType<iPTR, "Type::PointerTyID">; // i8** -def llvm_descriptor_ty : LLVMType<iPTR, "Type::PointerTyID">; // global* +def llvm_ptr_ty : LLVMPointerType<llvm_i8_ty>; // i8* +def llvm_ptrptr_ty : LLVMPointerType<llvm_ptr_...

LLVM knows what all the types of the intrinsic functions are; I thought, why are users (including llvm-gcc...) required to duplicate all this information in order to use them? I mean in order to call getOrInsertFunction to get declarations for them. So I wrote this patch, which allows all this code to be generated automatically. Is this a good approach? Dan -- Dan Gohman, Cray Inc. <djg at

...u can either add your intrinsics directly, or just add an > include to your own file. Here I'm adding them directly. > > a) Add a definition of your intrinsic. In our case, it looks like > > def int_my_foo : Intrinsic<[llvm_ptr_ty], > [llvm_ptrptr_ty, llvm_ptr_ty]>, > GCCBuiltin<"__builtin_my_foo">; > > Clearly the fun here is the GCCBuiltin tag which is what gets > everything to /just work/. > > 7) Build llvm. > > 8) Configure llvm-gcc with your modified llvm binary dir...

As mentioned in an earlier mail, I am working on an LLVM backend for a custom processor based on MIPS. My problem is how to extend LLVM to support some esoteric/non-standard feature of the underlying hardware. I saw in the "Extending LLVM" document, that the easiest / most common way to do this was using an intrinsic function, and examples of the technique abound (all SSE for