cuda : fix warp reduction initialization of shared mem
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1 changed files with 17 additions and 6 deletions
23
ggml-cuda.cu
23
ggml-cuda.cu
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@ -4733,6 +4733,11 @@ static __global__ void soft_max_f32(const float * x, const float * y, float * ds
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const int block_size = blockDim.x;
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const int warp_id = threadIdx.x / WARP_SIZE;
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const int lane_id = threadIdx.x % WARP_SIZE;
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__shared__ float buf[CUDA_SOFT_MAX_BLOCK_SIZE/WARP_SIZE];
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float max_val = -INFINITY;
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for (int col = tid; col < ncols; col += block_size) {
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@ -4744,13 +4749,16 @@ static __global__ void soft_max_f32(const float * x, const float * y, float * ds
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// find the max value in the block
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max_val = warp_reduce_max(max_val);
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if (block_size > WARP_SIZE) {
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__shared__ float buf[CUDA_SOFT_MAX_BLOCK_SIZE/WARP_SIZE];
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int warp_id = threadIdx.x / WARP_SIZE;
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int lane_id = threadIdx.x % WARP_SIZE;
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if (warp_id == 0) {
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buf[lane_id] = -INFINITY;
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}
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__syncthreads();
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if (lane_id == 0) {
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buf[warp_id] = max_val;
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}
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__syncthreads();
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max_val = buf[lane_id];
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max_val = warp_reduce_max(max_val);
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}
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@ -4768,13 +4776,16 @@ static __global__ void soft_max_f32(const float * x, const float * y, float * ds
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// find the sum of exps in the block
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tmp = warp_reduce_sum(tmp);
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if (block_size > WARP_SIZE) {
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__shared__ float buf[CUDA_SOFT_MAX_BLOCK_SIZE/WARP_SIZE];
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int warp_id = threadIdx.x / WARP_SIZE;
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int lane_id = threadIdx.x % WARP_SIZE;
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if (warp_id == 0) {
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buf[lane_id] = 0.f;
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}
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__syncthreads();
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if (lane_id == 0) {
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buf[warp_id] = tmp;
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}
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__syncthreads();
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tmp = buf[lane_id];
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tmp = warp_reduce_sum(tmp);
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}
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