请帮忙... 在opencl程序中，我收到这些错误。 我没有"oclUtils.h"头文件。S0 我没有把它包含在我的程序中。这就是我遇到这个问题的原因吗？我也在发送我的内核。 如果这是原因，我如何在不使用oclUtils.h的情况下使用原子函数？
*"__kernel void BLAS_susdot_kernel(__global float *x,__global int *index,__global float *y,const int n,__global float* dot_p) n"
"{ n"
" int block_x = get_group_id(0); n"
" int thread_x = get_local_id(0); n"
" int i = get_global_id(0); n"
" float dot_value, old = *dot_p; n"
" int warp_thread_id = i & (32-1); n"
" __local float tmp[512]; n"
" __local float share_dot_p; n"
" if(thread_x == 0) n"
" share_dot_p = 0.0; n"
" if (i < n) n"
" { n"
" tmp[i]= x[i]*y[index[i]]; n"
" if(warp_thread_id <16 && (i+16)< n) n"
" tmp[i]+=tmp[i+16]; n"
" if(warp_thread_id <8 && (i+8)< n ) n"
" tmp[i]+=tmp[i+8]; n"
" if(warp_thread_id <4 && (i+4)< n ) n"
" tmp[i]+=tmp[i+4]; n"
" if(warp_thread_id <2 && (i+2)< n) n"
" tmp[i]+=tmp[i+2]; n"
" if(warp_thread_id==0 && (i+1)< n) n"
" { n"
" tmp[i]+=tmp[i+1]; n"
" do n"
" { n"
" dot_value = old; n"
" old = convert_int( atomic_cmpxchg((volatile __global unsigned int*)&share_dot_p, convert_int(dot_value), convert_int(tmp[i] + dot_value))); n"
" } while (dot_value != old); n"
" //share_dot_p +=tmp[i]; n"
" } n"
" if(thread_x==0) n"
" { n"
" n"
" do n"
" { n"
" dot_value = old; n"
" old = convert_int(atomic_cmpxchg((volatile __global unsigned int *) dot_p, convert_int(dot_value), convert_int(share_dot_p+dot_value))); n"
" } while(dot_value != old); n"
" // *dot_p += share_dot_p; n"
" n"
" } n"
" } n"
"} n"
"n";*
我得到的错误：
Build Program Info: ptxas application ptx input, line 160; error : Label expected for argument 0 of instruction 'call'
ptxas application ptx input, line 160; error : Call target not recognized
ptxas application ptx input, line 160; error : Function 'atomic_cmpxchg' not declared in this scope
ptxas application ptx input, line 160; error : Call target not recognized
ptxas application ptx input, line 185; error : Label expected for argument 0 of instruction 'call'
ptxas application ptx input, line 185; error : Call target not recognized
ptxas application ptx input, line 185; error : Function 'atomic_cmpxchg' not declared in this scope
ptxas application ptx input, line 185; error : Call target not recognized
ptxas application ptx input, line 161; error : Unknown symbol 'atomic_cmpxchg'
ptxas application ptx input, line 186; error : Unknown symbol 'atomic_cmpxchg'
ptxas fatal : Ptx assembly aborted due to errors
error : Ptx compilation failed: gpu='sm_13', device code='cuModuleLoadDataEx_4'
: Considering profile 'compute_13' for gpu='sm_13' in 'cuModuleLoadDataEx_4'
: Retrieving binary for 'cuModuleLoadDataEx_4', for gpu='sm_13', usage mode=' '
: Considering profile 'compute_13' for gpu='sm_13' in 'cuModuleLoadDataEx_4'
: Control flags for 'cuModuleLoadDataEx_4' disable search path
: Ptx binary found for 'cuModuleLoadDataEx_4', architecture='compute_13'
: Ptx compilation for 'cuModuleLoadDataEx_4', for gpu='sm_13', ocg options=' '
由于您使用的是atomic_cmpxchg，它是 OpenCL 中可选扩展的一部分，因此您需要检查您的设备是否支持它，然后在内核代码中启用它：
-
检查
cl_khr_global_int32_base_atomics是否列在clGetDeviceInfo(..., CL_DEVICE_EXTENSIONS, ...)返回的扩展中 -
将以下内容添加到内核代码的顶部：
#pragma OPENCL EXTENSION cl_khr_global_int32_base_atomics : enable
请注意，如果使用具有 __local 位或 64 位操作数的原子函数，则可能需要启用其他扩展：
#pragma OPENCL EXTENSION cl_khr_global_int32_base_atomics : enable
#pragma OPENCL EXTENSION cl_khr_local_int32_base_atomics : enable
#pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable
#pragma OPENCL EXTENSION cl_khr_global_int32_extended_atomics : enable
#pragma OPENCL EXTENSION cl_khr_local_int32_extended_atomics : enable
#pragma OPENCL EXTENSION cl_khr_int64_extended_atomics : enable
此外，请确保您使用的是 OpenCL 1.1或更高版本，因为原子函数在 OpenCL 1.0 中的命名方式不同。例如，如果您使用 NVidia 的nvcc实用程序脱机编译内核，请确保指定-arch命令行开关。
这些特定错误与 oclUtils.h 无关。这是一个 NVidia 头文件，只有在主机(而不是内核)代码中调用 ocl* 函数时才需要该文件。