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Composable Kernel: /home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-composable-kernel/checkouts/develop/include/ck/utility/workgroup_barrier.hpp Source File

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 #pragma once
 #include <hip/hip_runtime.h>
 #include <stdint.h>
  
 namespace ck {
 struct workgroup_barrier
 {
     __device__ workgroup_barrier(uint32_t* ptr) : base_ptr(ptr) {}
  
     __device__ uint32_t ld(uint32_t offset)
     {
 #if 0
         float d = llvm_amdgcn_raw_buffer_load_fp32(
                         amdgcn_make_buffer_resource(base_ptr),
                         0,
                         offset,
                         AMDGCN_BUFFER_GLC);
         union cvt {
             float f32;
             uint32_t u32;
         };
         cvt x;
         x.f32 = d;
         return x.u32;
 #endif
         return __atomic_load_n(base_ptr + offset, __ATOMIC_RELAXED);
     }
  
     __device__ void wait_eq(uint32_t offset, uint32_t value)
     {
         if(threadIdx.x == 0)
         {
             while(ld(offset) != value) {}
         }
         __syncthreads();
     }
  
     __device__ void wait_lt(uint32_t offset, uint32_t value)
     {
         if(threadIdx.x == 0)
         {
             while(ld(offset) < value) {}
         }
         __syncthreads();
     }
  
     __device__ void wait_set(uint32_t offset, uint32_t compare, uint32_t value)
     {
         if(threadIdx.x == 0)
         {
             while(atomicCAS(base_ptr + offset, compare, value) != compare) {}
         }
         __syncthreads();
     }
  
     // enter critical zoon, assume buffer is zero when launch kernel
     __device__ void aquire(uint32_t offset) { wait_set(offset, 0, 1); }
  
     // exit critical zoon, assume buffer is zero when launch kernel
     __device__ void release(uint32_t offset) { wait_set(offset, 1, 0); }
  
     __device__ void inc(uint32_t offset)
     {
         __syncthreads();
         if(threadIdx.x == 0)
         {
             atomicAdd(base_ptr + offset, 1);
         }
     }
  
     uint32_t* base_ptr;
 };
 } // namespace ck