mirror of
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417 lines
8.8 KiB
C++
417 lines
8.8 KiB
C++
/*
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SIMD-ified LDPC algorithms
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Copyright 2018 Ahmet Inan <xdsopl@gmail.com>
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*/
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#ifndef ALGORITHMS_HH
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#define ALGORITHMS_HH
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#include "generic.h"
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#include "exclusive_reduce.h"
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namespace ldpctool {
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template <typename VALUE, int WIDTH>
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struct SelfCorrectedUpdate<SIMD<VALUE, WIDTH>>
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{
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typedef SIMD<VALUE, WIDTH> TYPE;
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static void update(TYPE *a, TYPE b)
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{
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*a = vreinterpret<TYPE>(vand(vmask(b), vorr(vceqz(*a), veor(vcgtz(*a), vcltz(b)))));
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}
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};
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template <typename VALUE, int WIDTH, typename UPDATE>
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struct MinSumAlgorithm<SIMD<VALUE, WIDTH>, UPDATE>
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{
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typedef SIMD<VALUE, WIDTH> TYPE;
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static TYPE zero()
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{
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return vzero<TYPE>();
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}
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static TYPE one()
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{
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return vdup<TYPE>(1);
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}
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static TYPE min(TYPE a, TYPE b)
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{
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return vmin(a, b);
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}
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static TYPE sign(TYPE a, TYPE b)
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{
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return vsign(a, b);
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}
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static void finalp(TYPE *links, int cnt)
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{
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TYPE mags[cnt], mins[cnt];
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for (int i = 0; i < cnt; ++i)
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mags[i] = vabs(links[i]);
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CODE::exclusive_reduce(mags, mins, cnt, min);
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TYPE signs[cnt];
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CODE::exclusive_reduce(links, signs, cnt, sign);
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for (int i = 0; i < cnt; ++i)
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links[i] = sign(mins[i], signs[i]);
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}
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static TYPE add(TYPE a, TYPE b)
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{
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return vadd(a, b);
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}
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static TYPE sub(TYPE a, TYPE b)
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{
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return vsub(a, b);
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}
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static bool bad(TYPE v, int blocks)
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{
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auto tmp = vcgtz(v);
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for (int i = 0; i < blocks; ++i)
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if (!tmp.v[i])
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return true;
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return false;
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}
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static void update(TYPE *a, TYPE b)
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{
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UPDATE::update(a, b);
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}
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};
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template <int WIDTH, typename UPDATE>
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struct MinSumAlgorithm<SIMD<int8_t, WIDTH>, UPDATE>
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{
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typedef int8_t VALUE;
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typedef SIMD<VALUE, WIDTH> TYPE;
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static TYPE zero()
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{
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return vzero<TYPE>();
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}
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static TYPE one()
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{
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return vdup<TYPE>(1);
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}
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static TYPE sign(TYPE a, TYPE b)
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{
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return vsign(a, b);
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}
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static TYPE eor(TYPE a, TYPE b)
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{
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return vreinterpret<TYPE>(veor(vmask(a), vmask(b)));
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}
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static TYPE orr(TYPE a, TYPE b)
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{
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return vreinterpret<TYPE>(vorr(vmask(a), vmask(b)));
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}
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static TYPE other(TYPE a, TYPE b, TYPE c)
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{
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return vreinterpret<TYPE>(vbsl(vceq(a, b), vmask(c), vmask(b)));
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}
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static void finalp(TYPE *links, int cnt)
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{
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TYPE mags[cnt];
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for (int i = 0; i < cnt; ++i)
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mags[i] = vqabs(links[i]);
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TYPE mins[2];
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mins[0] = vmin(mags[0], mags[1]);
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mins[1] = vmax(mags[0], mags[1]);
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for (int i = 2; i < cnt; ++i) {
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mins[1] = vmin(mins[1], vmax(mins[0], mags[i]));
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mins[0] = vmin(mins[0], mags[i]);
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}
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TYPE signs = links[0];
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for (int i = 1; i < cnt; ++i)
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signs = eor(signs, links[i]);
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for (int i = 0; i < cnt; ++i)
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links[i] = sign(other(mags[i], mins[0], mins[1]), orr(eor(signs, links[i]), vdup<TYPE>(127)));
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}
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static TYPE add(TYPE a, TYPE b)
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{
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return vqadd(a, b);
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}
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static TYPE sub(TYPE a, TYPE b)
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{
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return vqsub(a, b);
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}
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static bool bad(TYPE v, int blocks)
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{
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auto tmp = vcgtz(v);
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for (int i = 0; i < blocks; ++i)
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if (!tmp.v[i])
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return true;
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return false;
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}
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static void update(TYPE *a, TYPE b)
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{
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UPDATE::update(a, vmin(vmax(b, vdup<TYPE>(-32)), vdup<TYPE>(31)));
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}
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};
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template <typename VALUE, int WIDTH, typename UPDATE, int FACTOR>
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struct OffsetMinSumAlgorithm<SIMD<VALUE, WIDTH>, UPDATE, FACTOR>
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{
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typedef SIMD<VALUE, WIDTH> TYPE;
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static TYPE zero()
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{
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return vzero<TYPE>();
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}
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static TYPE one()
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{
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return vdup<TYPE>(1);
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}
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static TYPE min(TYPE a, TYPE b)
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{
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return vmin(a, b);
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}
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static TYPE sign(TYPE a, TYPE b)
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{
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return vsign(a, b);
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}
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static void finalp(TYPE *links, int cnt)
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{
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TYPE beta = vdup<TYPE>(0.5 * FACTOR);
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TYPE mags[cnt], mins[cnt];
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for (int i = 0; i < cnt; ++i)
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mags[i] = vmax(vsub(vabs(links[i]), beta), vzero<TYPE>());
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CODE::exclusive_reduce(mags, mins, cnt, min);
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TYPE signs[cnt];
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CODE::exclusive_reduce(links, signs, cnt, sign);
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for (int i = 0; i < cnt; ++i)
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links[i] = sign(mins[i], signs[i]);
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}
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static TYPE add(TYPE a, TYPE b)
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{
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return vadd(a, b);
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}
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static TYPE sub(TYPE a, TYPE b)
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{
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return vsub(a, b);
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}
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static bool bad(TYPE v, int blocks)
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{
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auto tmp = vcgtz(v);
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for (int i = 0; i < blocks; ++i)
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if (!tmp.v[i])
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return true;
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return false;
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}
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static void update(TYPE *a, TYPE b)
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{
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UPDATE::update(a, b);
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}
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};
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template <int WIDTH, typename UPDATE, int FACTOR>
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struct OffsetMinSumAlgorithm<SIMD<int8_t, WIDTH>, UPDATE, FACTOR>
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{
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typedef int8_t VALUE;
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typedef SIMD<VALUE, WIDTH> TYPE;
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static TYPE zero()
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{
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return vzero<TYPE>();
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}
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static TYPE one()
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{
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return vdup<TYPE>(1);
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}
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static TYPE sign(TYPE a, TYPE b)
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{
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return vsign(a, b);
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}
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static TYPE eor(TYPE a, TYPE b)
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{
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return vreinterpret<TYPE>(veor(vmask(a), vmask(b)));
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}
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static TYPE orr(TYPE a, TYPE b)
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{
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return vreinterpret<TYPE>(vorr(vmask(a), vmask(b)));
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}
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static TYPE other(TYPE a, TYPE b, TYPE c)
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{
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return vreinterpret<TYPE>(vbsl(vceq(a, b), vmask(c), vmask(b)));
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}
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static void finalp(TYPE *links, int cnt)
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{
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auto beta = vunsigned(vdup<TYPE>(std::nearbyint(0.5 * FACTOR)));
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TYPE mags[cnt];
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for (int i = 0; i < cnt; ++i)
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mags[i] = vsigned(vqsub(vunsigned(vqabs(links[i])), beta));
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TYPE mins[2];
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mins[0] = vmin(mags[0], mags[1]);
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mins[1] = vmax(mags[0], mags[1]);
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for (int i = 2; i < cnt; ++i) {
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mins[1] = vmin(mins[1], vmax(mins[0], mags[i]));
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mins[0] = vmin(mins[0], mags[i]);
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}
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TYPE signs = links[0];
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for (int i = 1; i < cnt; ++i)
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signs = eor(signs, links[i]);
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for (int i = 0; i < cnt; ++i)
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links[i] = sign(other(mags[i], mins[0], mins[1]), orr(eor(signs, links[i]), vdup<TYPE>(127)));
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}
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static TYPE add(TYPE a, TYPE b)
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{
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return vqadd(a, b);
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}
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static TYPE sub(TYPE a, TYPE b)
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{
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return vqsub(a, b);
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}
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static bool bad(TYPE v, int blocks)
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{
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auto tmp = vcgtz(v);
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for (int i = 0; i < blocks; ++i)
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if (!tmp.v[i])
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return true;
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return false;
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}
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static void update(TYPE *a, TYPE b)
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{
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UPDATE::update(a, vmin(vmax(b, vdup<TYPE>(-32)), vdup<TYPE>(31)));
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}
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};
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template <typename VALUE, int WIDTH, typename UPDATE, int FACTOR>
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struct MinSumCAlgorithm<SIMD<VALUE, WIDTH>, UPDATE, FACTOR>
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{
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typedef SIMD<VALUE, WIDTH> TYPE;
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static TYPE zero()
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{
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return vzero<TYPE>();
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}
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static TYPE one()
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{
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return vdup<TYPE>(1);
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}
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static TYPE sign(TYPE a, TYPE b)
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{
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return vsign(a, b);
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}
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static TYPE correction_factor(TYPE a, TYPE b)
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{
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TYPE apb = vabs(vadd(a, b));
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TYPE apb2 = vadd(apb, apb);
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TYPE amb = vabs(vsub(a, b));
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TYPE amb2 = vadd(amb, amb);
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TYPE factor2 = vdup<TYPE>(FACTOR * 2);
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auto pc = vmask(vdup<TYPE>(VALUE(FACTOR) / VALUE(2)));
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auto nc = vmask(vdup<TYPE>(-VALUE(FACTOR) / VALUE(2)));
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pc = vand(pc, vand(vcgt(factor2, apb), vcgt(amb, apb2)));
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nc = vand(nc, vand(vcgt(factor2, amb), vcgt(apb, amb2)));
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return vreinterpret<TYPE>(vorr(pc, nc));
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}
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static TYPE minc(TYPE a, TYPE b)
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{
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TYPE m = vmin(vabs(a), vabs(b));
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TYPE x = vsign(vsign(m, a), b);
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x = vadd(x, correction_factor(a, b));
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return x;
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}
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static void finalp(TYPE *links, int cnt)
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{
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TYPE tmp[cnt];
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CODE::exclusive_reduce(links, tmp, cnt, minc);
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for (int i = 0; i < cnt; ++i)
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links[i] = tmp[i];
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}
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static TYPE add(TYPE a, TYPE b)
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{
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return vadd(a, b);
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}
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static TYPE sub(TYPE a, TYPE b)
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{
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return vsub(a, b);
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}
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static bool bad(TYPE v, int blocks)
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{
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auto tmp = vcgtz(v);
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for (int i = 0; i < blocks; ++i)
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if (!tmp.v[i])
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return true;
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return false;
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}
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static void update(TYPE *a, TYPE b)
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{
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UPDATE::update(a, b);
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}
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};
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template <int WIDTH, typename UPDATE, int FACTOR>
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struct MinSumCAlgorithm<SIMD<int8_t, WIDTH>, UPDATE, FACTOR>
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{
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typedef int8_t VALUE;
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typedef SIMD<VALUE, WIDTH> TYPE;
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static TYPE zero()
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{
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return vzero<TYPE>();
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}
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static TYPE one()
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{
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return vdup<TYPE>(1);
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}
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static TYPE sign(TYPE a, TYPE b)
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{
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return vsign(a, b);
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}
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static TYPE correction_factor(TYPE a, TYPE b)
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{
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TYPE apb = vqabs(vqadd(a, b));
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TYPE apb2 = vqadd(apb, apb);
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TYPE amb = vqabs(vqsub(a, b));
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TYPE amb2 = vqadd(amb, amb);
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TYPE factor2 = vdup<TYPE>(FACTOR * 2);
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auto pc = vmask(vdup<TYPE>(VALUE(FACTOR) / VALUE(2)));
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auto nc = vmask(vdup<TYPE>(-VALUE(FACTOR) / VALUE(2)));
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pc = vand(pc, vand(vcgt(factor2, apb), vcgt(amb, apb2)));
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nc = vand(nc, vand(vcgt(factor2, amb), vcgt(apb, amb2)));
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return vreinterpret<TYPE>(vorr(pc, nc));
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}
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static TYPE minc(TYPE a, TYPE b)
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{
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TYPE m = vmin(vqabs(a), vqabs(b));
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TYPE x = vsign(vsign(m, a), b);
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x = vqadd(x, correction_factor(a, b));
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return x;
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}
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static void finalp(TYPE *links, int cnt)
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{
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TYPE *tmp = new TYPE[cnt];
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CODE::exclusive_reduce(links, tmp, cnt, minc);
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for (int i = 0; i < cnt; ++i)
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links[i] = tmp[i];
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delete[] tmp;
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}
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static TYPE add(TYPE a, TYPE b)
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{
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return vqadd(a, b);
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}
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static TYPE sub(TYPE a, TYPE b)
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{
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return vqsub(a, b);
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}
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static bool bad(TYPE v, int blocks)
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{
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auto tmp = vcgtz(v);
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for (int i = 0; i < blocks; ++i)
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if (!tmp.v[i])
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return true;
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return false;
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}
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static void update(TYPE *a, TYPE b)
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{
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UPDATE::update(a, vmin(vmax(b, vdup<TYPE>(-32)), vdup<TYPE>(31)));
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}
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};
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} // namespace ldpctool
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#endif
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