mirror of https://github.com/hpcaitech/ColossalAI
59 lines
1.6 KiB
Plaintext
59 lines
1.6 KiB
Plaintext
// Adapted from turboderp exllama: https://github.com/turboderp/exllama
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#ifndef _cuda_compat_cuh
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#define _cuda_compat_cuh
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// atomicAdd for half types, to support CC < 7.x
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__device__ __forceinline__ void atomicAdd_half(half* address, half val)
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{
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unsigned int * address_as_ui = (unsigned int *) ((char *)address - ((size_t)address & 2));
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unsigned int old = *address_as_ui;
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unsigned int assumed;
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do
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{
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assumed = old;
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__half_raw hsum;
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hsum.x = (size_t)address & 2 ? (old >> 16) : (old & 0xffff);
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half tmpres = __hadd(hsum, val);
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hsum = __half_raw(tmpres);
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old = (size_t)address & 2 ? (old & 0xffff) | (hsum.x << 16) : (old & 0xffff0000) | hsum.x;
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old = atomicCAS(address_as_ui, assumed, old);
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}
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while (assumed != old);
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}
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// atomicAdd for half2 types
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__device__ __forceinline__ void atomicAdd_half2(half2* address, half2 val)
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{
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unsigned int* address_as_ui = (unsigned int*)address;
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unsigned int old = *address_as_ui;
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unsigned int assumed;
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do
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{
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assumed = old;
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half2 old_val = *((half2*)&old);
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half2 new_val = __hadd2(old_val, val);
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old = atomicCAS(address_as_ui, assumed, *((unsigned int*)&new_val));
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}
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while (assumed != old);
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}
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//
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#if defined(__CUDA_ARCH__) || defined(USE_ROCM)
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#if __CUDA_ARCH__ < 700 || defined(USE_ROCM)
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__device__ __forceinline__ void atomicAdd(half* address, half val) { atomicAdd_half(address, val); }
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#if __CUDA_ARCH__ < 600 || defined(USE_ROCM)
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__device__ __forceinline__ void atomicAdd(half2* address, half2 val) { atomicAdd_half2(address, val); }
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#endif
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#endif
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#endif
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#endif
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