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keep word offset and shift paired

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This commit is contained in:
Ahmet Inan 2019-09-29 09:55:55 +02:00
commit 02d5b5f12c
2 changed files with 26 additions and 33 deletions
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19
ldpc_decoder.hh
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@ -42,6 +42,7 @@ class LDPCDecoder
static const int BNL = (TABLE::LINKS_TOTAL + D-1) / D;
typedef SIMD<int8_t, SIMD_SIZE> TYPE;
typedef struct { uint16_t off; uint16_t shi; } Loc;
Rotate<TYPE, D> rotate;
TYPE bnl[BNL];
@ -109,10 +110,10 @@ class LDPCDecoder
}
auto res = vmask(vzero<TYPE>());
for (int j = 0; j < W; ++j) {
int of[cnt], sh[cnt];
Loc lo[cnt];
for (int c = 0; c < cnt; ++c) {
of[c] = offset[c] / D + shift[c] % W;
sh[c] = shift[c] / W;
lo[c].off = offset[c] / D + shift[c] % W;
lo[c].shi = shift[c] / W;
shift[c] = (shift[c] + 1) % M;
}
TYPE par[2];
@ -127,7 +128,7 @@ class LDPCDecoder
par[1] = pty[W*i+j];
TYPE mes[cnt];
for (int c = 0; c < cnt; ++c)
mes[c] = rotate(msg[of[c]], -sh[c]);
mes[c] = rotate(msg[lo[c].off], -lo[c].shi);
TYPE cnv = vdup<TYPE>(1);
for (int c = 0; c < 2; ++c)
cnv = vsign(cnv, par[c]);
@ -153,10 +154,10 @@ class LDPCDecoder
}
int deg = cnt + 2;
for (int j = 0; j < W; ++j) {
int of[cnt], sh[cnt];
Loc lo[cnt];
for (int c = 0; c < cnt; ++c) {
of[c] = offset[c] / D + shift[c] % W;
sh[c] = shift[c] / W;
lo[c].off = offset[c] / D + shift[c] % W;
lo[c].shi = shift[c] / W;
shift[c] = (shift[c] + 1) % M;
}
TYPE par[2];
@ -171,7 +172,7 @@ class LDPCDecoder
par[1] = pty[W*i+j];
TYPE mes[cnt];
for (int c = 0; c < cnt; ++c)
mes[c] = rotate(msg[of[c]], -sh[c]);
mes[c] = rotate(msg[lo[c].off], -lo[c].shi);
TYPE inp[deg], out[deg];
for (int c = 0; c < cnt; ++c)
inp[c] = vqsub(mes[c], bl[c]);
@ -198,7 +199,7 @@ class LDPCDecoder
}
pty[W*i+j] = par[1];
for (int c = 0; c < cnt; ++c)
msg[of[c]] = rotate(mes[c], sh[c]);
msg[lo[c].off] = rotate(mes[c], lo[c].shi);
bl += deg;
}
}