[Libclc-dev] architecture-specific builtins and OpenCL

[Richard Gorton]

grep reverse ./include/llvm/IR/IntrinsicsCogE.td ./tools/clang/include/clang/Basic/BuiltinsCogE.def
./include/llvm/IR/IntrinsicsCogE.td:def int_coge_reverse: GCCBuiltin<"__builtin_coge_reverse">,
./tools/clang/include/clang/Basic/BuiltinsCogE.def:BUILTIN(__builtin_coge_reverse,     "ULLiULLi", "nc")

unsigned long (uint64_t) as the input and result.  Removing the 'kernel' keyword does not improve matters; the following .cl file also crashes
void fred(unsigned long *in, unsigned long* where, int id)
{
    where[id] = __builtin_coge_reverse(in[id]);
}

(I did not use any of the #pragmas or include <CL/cl.h>)

Regards,
	Richard
	rcgorton at cog-e.com




On Nov 11, 2014, at 1:09 PM, Tom Stellard <tom at stellard.net> wrote:

> On Tue, Nov 11, 2014 at 01:01:16PM -0500, Richard Gorton wrote:
>> I originally posted this to llvmdev,but it strikes me that this might be a better place to make the query.
>> 
>> 
>>> I'm trying to ascertain whether or not it is possible to use architecture-specific builtins (LLVM3.4.2) in OpenCL:
>>> 
>>> This compiles cleanly for my target when it has a .c extension:
>>> 
>>> void fred(unsigned long* in, unsigned long* where)
>>> {
>>>   *where = __builtin_coge_reverse(*in);
>>> }
>>> 
>>> But this variant crashes very early when it is a .cl file:
>>> void kernel fred(unsigned long *in, unsigned long* where)
>>> {
> 
> I just realized you are passing private pointers to your kernel.  This is
> not allowed in OpenCL.  Does it work if you drop the kernel attribute?
> 
> -Tom
> 
>>>   *where = __builtin_coge_reverse(*in);
>>> }
>>> 
>>> 
>>> 
>>> I'm not even sure how to go about determining the source of problem - it crashes before generating any IR (-mllvm -print-after-all)
>>> 
>>> clang: /localspace/rcgorton/svn/Compiler/trunk/LLVM3_4/llvm-3.4.2.src/lib/IR/Instructions.cpp:2352: static llvm::CastInst* llvm::CastInst::Create(llvm::Instruction::CastOps, llvm::Value*, llvm::Type*, const llvm::Twine&, llvm::Instruction*): Assertion `castIsValid(op, S, Ty) && "Invalid cast!"' failed.
>>> 
>>> Is there a document somewhere which describes how to use various front-end-dumping switches?  Is there a better way to attack this?
>>> 
>>> Thanks in advance,
>>> 
>>> 	Richard
>>> 	rcgorton at cog-e.com
>> 
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