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[n, k//2] int4pack to [n, k//8] w/o transpose #1186

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[n, k//2] int4pack to [n, k//8] w/o transpose #1186

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b0ff637
[n, k//2] int4pack to [n, k//8] w/o transpose
ZhiweiYan-96 Dec 20, 2024
f362e61
weight packed to [n, k//8]
ZhiweiYan-96 Dec 26, 2024
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15 changes: 9 additions & 6 deletions src/ATen/native/xpu/sycl/WeightInt4PackKernel.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -9,19 +9,22 @@ namespace at::native::xpu {
struct WeightToInt4PackKernelFunctor {
void operator()(sycl::item<1> item) const {
auto idx = item.get_linear_id();
int out_y = idx / N_;
int out_x = idx % N_;
int in_y = out_x;
int in_x = out_y * 4;
int K_div_2 = K_ / 2;
int K_div_8 = K_ / 8;
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although might never happened, but could you handle K_ not divided by 8?

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good point, let me add an assert

int out_y = idx / K_div_8;
int out_x = idx % K_div_8;
int in_y = out_y;
int in_x = out_x * 4;

using vec_t = memory::aligned_vector<uint8_t, 4>;
vec_t input = *reinterpret_cast<vec_t*>(&weight_[in_y * K_div_2 + in_x]);
vec_t output;
#pragma unroll
for (int i = 0; i < 4; i++) {
output[i] = input[3 - i];
// output[i] = input[3 - i];
output[i] = input[i];
}
*reinterpret_cast<vec_t*>(&weight_packed_[out_y * N_ + out_x]) = output;
*reinterpret_cast<vec_t*>(&weight_packed_[out_y * K_div_8 + out_x]) = output;
}
WeightToInt4PackKernelFunctor(
uint32_t* weight_packed,
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