1#include "scale.cuh"
 2
 3#define MAX_GRIDDIM_X 0x7FFFFFFF
 4
 5static __global__ void scale_f32(const float * x, float * dst, const float scale, const float bias, const int64_t nelements) {
 6    int64_t tid = (int64_t)blockIdx.x * (int64_t)blockDim.x + (int64_t)threadIdx.x;
 7    int64_t stride = (int64_t)blockDim.x * (int64_t)gridDim.x;
 8
 9    for (int64_t i = tid; i < nelements; i += stride) {
10        dst[i] = scale * x[i] + bias;
11    }
12}
13
14static void scale_f32_cuda(const float * x, float * dst, const float scale, const float bias, const int64_t nelements, cudaStream_t stream) {
15    const int64_t num_blocks = (nelements + CUDA_SCALE_BLOCK_SIZE - 1) / CUDA_SCALE_BLOCK_SIZE;
16    scale_f32<<<MIN(MAX_GRIDDIM_X, num_blocks), CUDA_SCALE_BLOCK_SIZE, 0, stream>>>(x, dst, scale, bias, nelements);
17}
18
19void ggml_cuda_op_scale(ggml_backend_cuda_context & ctx, ggml_tensor * dst) {
20    const ggml_tensor * src0 = dst->src[0];
21    const float * src0_d = (const float *)src0->data;
22    float * dst_d = (float *)dst->data;
23    cudaStream_t stream = ctx.stream();
24
25    GGML_ASSERT(src0->type == GGML_TYPE_F32);
26    GGML_ASSERT( dst->type == GGML_TYPE_F32);
27
28    float scale;
29    float bias;
30    memcpy(&scale, (float *) dst->op_params + 0, sizeof(float));
31    memcpy(&bias,  (float *) dst->op_params + 1, sizeof(float));
32
33    scale_f32_cuda(src0_d, dst_d, scale, bias, ggml_nelements(src0), stream);
34}