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[Perf] Vectorize static_scaled_int8_quant_kernel #19062

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[Perf] Vectorize static_scaled_int8_quant_kernel #19062

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22 changes: 20 additions & 2 deletions csrc/quantization/compressed_tensors/int8_quant_kernels.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
#include <cmath>

#include "../../dispatch_utils.h"
#include "../vectorization.cuh"

#ifndef USE_ROCM
#include <cub/util_type.cuh>
Expand Down Expand Up @@ -115,8 +116,25 @@ __global__ void static_scaled_int8_quant_kernel(
out += token_idx * hidden_size;
input += token_idx * hidden_size;

for (int i = tid; i < hidden_size; i += blockDim.x) {
out[i] = float_to_int8_rn(static_cast<float>(input[i]) / scale);
int vec_size = hidden_size / 4;
int rem = hidden_size % 4;
vec4_t<scalar_t> const* vec_input =
reinterpret_cast<vec4_t<scalar_t> const*>(input);
q8x4_t<int8_t>* vec_out = reinterpret_cast<q8x4_t<int8_t>*>(out);
for (int i = tid; i < vec_size; i += blockDim.x) {
vec4_t<scalar_t> in_vec = vec_input[i];
q8x4_t<int8_t> out_vec;
out_vec.x = float_to_int8_rn(static_cast<float>(in_vec.x) / scale);
out_vec.y = float_to_int8_rn(static_cast<float>(in_vec.y) / scale);
out_vec.z = float_to_int8_rn(static_cast<float>(in_vec.z) / scale);
out_vec.w = float_to_int8_rn(static_cast<float>(in_vec.w) / scale);
vec_out[i] = out_vec;
}

int base = vec_size * 4;
for (int i = tid; i < rem; i += blockDim.x) {
out[base + i] =
float_to_int8_rn(static_cast<float>(input[base + i]) / scale);
}
}

Expand Down