Function gpu_allocArray

quest/src/gpu/gpu_config.cpp:437–466

qcomp* gpu_allocArray(qindex length) {
#if COMPILE_CUDA

    size_t numBytes = mem_getLocalQuregMemoryRequired(length);

    // attempt to malloc
    qcomp* ptr;
    cudaError_t errCode = cudaMalloc(&ptr, numBytes);

    // intercept memory-alloc error (handled by caller's validation)
    if (errCode == cudaErrorMemoryAllocation) {

        // malloc failure can break CUDA API state, so recover it in
        // case execution is continuing (e.g. by unit tests)
        clearPossibleCudaError();

        // indicate alloc failure
        return nullptr;
    }

    // pass all other unexpected errors to internal error handling
    CUDA_CHECK(errCode);

    return ptr;

#else
    error_gpuAllocButGpuNotCompiled();
    return nullptr;
#endif
}


void gpu_deallocArray(qcomp* amps) {