File size: 2,356 Bytes
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* Copyright (c) 2024 by FlashInfer team.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FLASHINFER_ACTIVATION_CUH_
#define FLASHINFER_ACTIVATION_CUH_
#include "math.cuh"
#include "utils.cuh"
#include "vec_dtypes.cuh"
namespace flashinfer {
namespace activation {
template <typename T, float (*Activation)(const float&)>
__global__ void act_and_mul_kernel(T* __restrict__ out, const T* __restrict__ input, const int d) {
constexpr uint32_t vec_size = 16 / sizeof(T);
const int64_t token_idx = blockIdx.x;
const int64_t thread_idx = threadIdx.x;
const int64_t stride = blockDim.x;
const int64_t offset = token_idx * 2 * d;
#if (__CUDACC_VER_MAJOR__ >= 12 && defined(__CUDA_ARCH__) && (__CUDA_ARCH__ >= 900))
asm volatile("griddepcontrol.wait;");
#endif
#pragma unroll 1
for (uint32_t idx = thread_idx; idx < d / vec_size; idx += stride) {
vec_t<float, vec_size> x_vec, y_vec, out_vec;
x_vec.cast_load(input + offset + idx * vec_size);
y_vec.cast_load(input + offset + d + idx * vec_size);
#pragma unroll
for (uint32_t i = 0; i < vec_size; ++i) {
out_vec[i] = Activation(x_vec[i]) * y_vec[i];
}
out_vec.cast_store(out + token_idx * d + idx * vec_size);
}
const int64_t remaining_offset = d - d % (stride * vec_size);
// process the remaining elements
#pragma unroll 1
for (int64_t idx = thread_idx; idx < d % (stride * vec_size); idx += stride) {
float x = input[offset + remaining_offset + idx],
y = input[offset + remaining_offset + d + idx];
out[token_idx * d + remaining_offset + idx] = Activation(x) * y;
}
#if (__CUDACC_VER_MAJOR__ >= 12 && defined(__CUDA_ARCH__) && (__CUDA_ARCH__ >= 900))
asm volatile("griddepcontrol.launch_dependents;");
#endif
}
} // namespace activation
} // namespace flashinfer
#endif // FLASHINFER_ACTIVATION_CUH_
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