The OpenCL code below fails to compile for an AMD 6168 CPU. AMD_APP version 2.8. Note the compiler does not complain about cl_khr_int64_base_atomics, so I have to assume they are supported for the 6168. The compiler error is listed before the code, and note that the signature I'm trying to use for atomic_cmpxchg is listed in the OpenCL spec.
http://www.khronos.org/registry/cl/sdk/1.0/docs/man/xhtml/cl_khr_int64_base_atomics.html
Thanks for any help!
jgw
2: clBuildProgram failed:
2: "/tmp/OCLOciay5.cl", line 46: error: no instance of overloaded function
2: "atomic_cmpxchg" matches the argument list
2: argument types are: (volatile __global ulong *, ulong, ulong)
2: } while (atomic_cmpxchg((volatile __global unsigned long *)source,
2: ^
2:
2: 1 error detected in the compilation of "/tmp/OCLOciay5.cl".
2:
2: Frontend phase failed compilation.
2:
2: -D__OCL_AMD__ -I/home/wohlbier/Chicoma/chicoma/config/../src/util -Werror -cl-strict-aliasing -cl-fast-relaxed-math -cl-std=CL1.1
// enable int64 atomics
#pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable
typedef double real_t;
inline void atomic_real_add(volatile __global real_t * source,
const real_t operand) {
union {
unsigned long intVal;
real_t realVal;
} newVal;
union {
unsigned long intVal;
real_t realVal;
} prevVal;
do {
prevVal.realVal = *source;
newVal.realVal = prevVal.realVal + operand;
} while (atomic_cmpxchg((volatile __global unsigned long *)source,
prevVal.intVal, newVal.intVal) != prevVal.intVal);
}
