77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
/*
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Copied from https://github.com/turboderp/exllamav2
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*/
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#ifndef _qdq_2_cuh
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#define _qdq_2_cuh
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#include "qdq_util.cuh"
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namespace vllm {
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namespace gptq {
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// Permutation:
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//
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// ffddbb99 77553311 eeccaa88 66442200
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__forceinline__ __device__ void shuffle_2bit_16(uint32_t* q, int stride) {
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uint32_t qa = q[0];
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uint32_t qb = 0;
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#pragma unroll
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for (int i = 0; i < 8; i++) {
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uint32_t qa0 = qa & 0x03;
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uint32_t qa1 = (qa & 0x0c) >> 2;
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qa >>= 4;
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qb |= (qa1 << (i * 2 + 16));
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qb |= (qa0 << (i * 2));
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}
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q[0] = qb;
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}
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__forceinline__ __device__ void dequant_2bit_16(const uint32_t q_0,
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half2 (&dq)[8], int stride,
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const uint32_t zero) {
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const uint32_t c0 = 0x64006400;
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const half y4_ = __float2half_rn(1.0f / 4.0f);
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const half y16_ = __float2half_rn(1.0f / 16.0f);
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const half y64_ = __float2half_rn(1.0f / 64.0f);
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const half2 y4 = __halves2half2(y4_, y4_);
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const half2 y16 = __halves2half2(y16_, y16_);
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const half2 y64 = __halves2half2(y64_, y64_);
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const half_uint16 z1_(0xe400 | zero); // half(-1024.0f - zero);
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const half z4_ = __hsub(__int2half_rn(-256), __int2half_rn(zero));
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const half z16_ = __hsub(__int2half_rn(-64), __int2half_rn(zero));
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const half z64_ = __hsub(__int2half_rn(-16), __int2half_rn(zero));
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const half2 z1 = __half2half2(z1_.as_half);
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const half2 z4 = __half2half2(z4_);
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const half2 z16 = __half2half2(z16_);
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const half2 z64 = __half2half2(z64_);
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uint32_t qa = q_0;
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half2_uint32 q0((qa & 0x00030003) | c0); // half2(q[ 0], q[ 1]) + 1024
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half2_uint32 q1((qa & 0x000c000c) | c0); // half2(q[ 2], q[ 3]) * 4 + 1024
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half2_uint32 q2((qa & 0x00300030) | c0); // half2(q[ 4], q[ 5]) * 16 + 1024
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half2_uint32 q3((qa & 0x00c000c0) | c0); // half2(q[ 6], q[ 7]) * 64 + 1024
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qa >>= 8;
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half2_uint32 q4((qa & 0x00030003) | c0); // half2(q[ 8], q[ 8]) + 1024
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half2_uint32 q5((qa & 0x000c000c) | c0); // half2(q[10], q[11]) * 4 + 1024
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half2_uint32 q6((qa & 0x00300030) | c0); // half2(q[12], q[13]) * 16 + 1024
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half2_uint32 q7((qa & 0x00c000c0) | c0); // half2(q[14], q[15]) * 64 + 1024
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dq[0] = __hadd2(q0.as_half2, z1);
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dq[1] = __hfma2(q1.as_half2, y4, z4);
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dq[2] = __hfma2(q2.as_half2, y16, z16);
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dq[3] = __hfma2(q3.as_half2, y64, z64);
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dq[4] = __hadd2(q4.as_half2, z1);
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dq[5] = __hfma2(q5.as_half2, y4, z4);
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dq[6] = __hfma2(q6.as_half2, y16, z16);
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dq[7] = __hfma2(q7.as_half2, y64, z64);
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}
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} // namespace gptq
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} // namespace vllm
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#endif
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