Skip to content

O
OpenXG-RAN
Commit 6bf628c5 authored by Raymond Knopp's avatar Raymond Knopp
Browse files
Options

took multi-segment code from private branch and optimized the input packing with AVX2 only for now.

parent 6022b821
Hide whitespace changes
Inline Side-by-side
Showing with 173 additions and 13 deletions
openair1/PHY/CODING/TESTBENCH/ldpctest.c
View file @ 6bf628c5
......@@ -76,15 +76,15 @@ int test_ldpc(short No_iteration,
opp_enabled=1;
cpu_freq_GHz = get_cpu_freq_GHz();
//short test_input[block_length];
unsigned char *test_input;
unsigned char *test_input[8]={NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};
//short *c; //padded codeword
short *esimated_output;
unsigned char *channel_input;
unsigned char *channel_input_optim;
unsigned char *channel_input_optim[8];
double *channel_output;
double *modulated_input;
short *channel_output_fixed;
unsigned int i,trial=0;
unsigned int i,j,trial=0;
short BG,Zc,Kb,nrows,ncols;
int no_punctured_columns,removed_bit;
int i1;
......@@ -93,9 +93,9 @@ int test_ldpc(short No_iteration,
*errors=0;
*crc_misses=0;
// generate input block
test_input=(unsigned char *)malloc(sizeof(unsigned char) * block_length/8);
channel_input = (unsigned char *)malloc(sizeof(unsigned char) * 68*384);
channel_input_optim = (unsigned char *)malloc(sizeof(unsigned char) * 68*384);
for (j=0;j<8;j++) test_input[j]=(unsigned char *)malloc16(sizeof(unsigned char) * block_length/8);
channel_input = (unsigned char *)malloc16(sizeof(unsigned char) * 68*384);
for (j=0;j<8;j++) channel_input_optim[j] = (unsigned char *)malloc16(sizeof(unsigned char) * 68*384);
modulated_input = (double *)malloc(sizeof(double) * 68*384);
channel_output = (double *)malloc(sizeof(double) * 68*384);
reset_meas(&time);
......@@ -107,7 +107,7 @@ int test_ldpc(short No_iteration,
for (i=0; i<block_length/8; i++)
{
//test_input[i]=(unsigned char) rand();
test_input[i]=217;
for (j=0;j<8;j++) test_input[j][i]=217;
}
//determine number of bits in codeword
......@@ -152,7 +152,7 @@ int test_ldpc(short No_iteration,
// printf("puncture:%d\n",no_punctured_columns);
removed_bit=(nrows-no_punctured_columns-2) * Zc+block_length-(int)(block_length/((float)nom_rate/(float)denom_rate));
if (ntrials==0)
ldpc_encoder_orig(test_input,channel_input, block_length, nom_rate, denom_rate, 1);
ldpc_encoder_orig(test_input[0],channel_input, block_length, nom_rate, denom_rate, 1);
for (trial=0; trial < ntrials; trial++)
{
......@@ -163,18 +163,19 @@ int test_ldpc(short No_iteration,
//if (BG==1)
//ldpc_encoder(test_input, channel_input,block_length,nom_rate,denom_rate);
//else
ldpc_encoder_orig(test_input, channel_input,block_length,nom_rate,denom_rate,0);
ldpc_encoder_orig(test_input[0], channel_input,block_length,nom_rate,denom_rate,0);
stop_meas(&time);
start_meas(&time_optim);
ldpc_encoder_optim(test_input,channel_input_optim,block_length,nom_rate,denom_rate,&tinput,&tprep,&tparity,&toutput);
// ldpc_encoder_optim_8seg(test_input[0],channel_input_optim[0],block_length,nom_rate,denom_rate,&tinput,&tprep,&tparity,&toutput);
ldpc_encoder_optim_8seg(test_input,channel_input_optim,block_length,nom_rate,denom_rate,8,&tinput,&tprep,&tparity,&toutput);
stop_meas(&time_optim);
if (ntrials==1)
for (i = 0; i < block_length+(nrows-no_punctured_columns) * Zc - removed_bit; i++)
if (channel_input[i]!=channel_input_optim[i]) printf("differ in pos %d (%d,%d)\n",i,
if (channel_input[i]!=channel_input_optim[0][i]) printf("differ in pos %d (%d,%d)\n",i,
channel_input[i],
channel_input_optim[i]);
channel_input_optim[0][i]);
//print_meas_now(&time, "", stdout);
// for (i=0;i<6400;i++)
......
openair1/PHY/CODING/defs.h
View file @ 6bf628c5
......@@ -578,5 +578,5 @@ int ldpc_encoder(unsigned char *test_input,unsigned char *channel_input,short bl
int ldpc_encoder_orig(unsigned char *test_input,unsigned char *channel_input,short block_length,int nom_rate,int denom_rate,unsigned char gen_code);
int ldpc_encoder_multi_segment(unsigned char **test_input,unsigned char **channel_input,short block_length,double rate,uint8_t n_segments);
int ldpc_encoder_optim(unsigned char *test_input,unsigned char *channel_input,short block_length,int nom_rate,int denom_rate,time_stats_t *tinput,time_stats_t *tprep,time_stats_t *tparity,time_stats_t *toutput);
int ldpc_encoder_optim_8seg(unsigned char **test_input,unsigned char **channel_input,short block_length,int nom_rate,int denom_rate,int n_segments,time_stats_t *tinput,time_stats_t *tprep,time_stats_t *tparity,time_stats_t *toutput);
#endif
openair1/PHY/CODING/ldpc_encoder2.c
View file @ 6bf628c5
......@@ -164,12 +164,14 @@ void encode_parity_check_part_optim(uint8_t *c,uint8_t *d, short BG,short Zc,sho
}
int ldpc_encoder_optim(unsigned char *test_input,unsigned char *channel_input,short block_length,int nom_rate,int denom_rate,time_stats_t *tinput,time_stats_t *tprep,time_stats_t *tparity,time_stats_t *toutput)
{
short BG,Zc,Kb,nrows,ncols;
int i,i1;
int no_punctured_columns,removed_bit;
//Table of possible lifting sizes
short lift_size[51]= {2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,20,22,24,26,28,30,32,36,40,44,48,52,56,60,64,72,80,88,96,104,112,120,128,144,160,176,192,208,224,240,256,288,320,352,384};
......@@ -230,12 +232,14 @@ int ldpc_encoder_optim(unsigned char *test_input,unsigned char *channel_input,sh
memset(d,0,sizeof(unsigned char) * nrows * Zc);
start_meas(tinput);
for (i=0; i<block_length; i++)
{
//c[i] = test_input[i/8]<<(i%8);
//c[i]=c[i]>>7&1;
c[i]=(test_input[i/8]&(1<<(i&7)))>>(i&7);
}
stop_meas(tinput);
if ((BG==1) || (BG==2 && Zc>64)) {
......@@ -274,3 +278,158 @@ int ldpc_encoder_optim(unsigned char *test_input,unsigned char *channel_input,sh
stop_meas(toutput);
return 0;
}
int ldpc_encoder_optim_8seg(unsigned char **test_input,unsigned char **channel_input,short block_length,int nom_rate,int denom_rate,int n_segments,time_stats_t *tinput,time_stats_t *tprep,time_stats_t *tparity,time_stats_t *toutput)
{
short BG,Zc,Kb,nrows,ncols;
int i,i1,j;
int no_punctured_columns,removed_bit;
//Table of possible lifting sizes
short lift_size[51]= {2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,20,22,24,26,28,30,32,36,40,44,48,52,56,60,64,72,80,88,96,104,112,120,128,144,160,176,192,208,224,240,256,288,320,352,384};
int simd_size;
AssertFatal(n_segments>0&&n_segments<=8,"0 < n_segments %d <= 8\n",n_segments);
//determine number of bits in codeword
if (block_length>3840)
{
BG=1;
Kb = 22;
nrows=46; //parity check bits
ncols=22; //info bits
}
else if (block_length<=3840)
{
BG=2;
nrows=42; //parity check bits
ncols=10; // info bits
if (block_length>640)
Kb = 10;
else if (block_length>560)
Kb = 9;
else if (block_length>192)
Kb = 8;
else
Kb = 6;
}
//find minimum value in all sets of lifting size
Zc=0;
for (i1=0; i1 < 51; i1++)
{
if (lift_size[i1] >= (double) block_length/Kb)
{
Zc = lift_size[i1];
//printf("%d\n",Zc);
break;
}
}
AssertFatal(Zc>0,"no valid Zc found for block length %d\n",block_length);
if ((Zc&31) > 0) simd_size = 16;
else simd_size = 32;
unsigned char c[22*Zc] __attribute__((aligned(32))); //padded input, unpacked, max size
unsigned char d[46*Zc] __attribute__((aligned(32))); //coded parity part output, unpacked, max size
unsigned char c_extension[2*22*Zc*simd_size] __attribute__((aligned(32))); //double size matrix of c
// calculate number of punctured bits
no_punctured_columns=(int)((nrows-2)*Zc+block_length-block_length*3)/Zc;
removed_bit=(nrows-no_punctured_columns-2) * Zc+block_length-(int)(block_length*3);
// printf("%d\n",no_punctured_columns);
// printf("%d\n",removed_bit);
// unpack input
memset(c,0,sizeof(unsigned char) * ncols * Zc);
memset(d,0,sizeof(unsigned char) * nrows * Zc);
start_meas(tinput);
#if 0
char temp;
for (i=0; i<block_length; i++) {
for (j=0; j<n_segments; j++) {
temp = (test_input[j][i/8]&(1<<(i&7)))>>(i&7);
//printf("c(%d,%d)=%d\n",j,i,temp);
c[i] |= (temp << j);
}
}
#else
#ifdef __AVX2__
__m256i shufmask = _mm256_set_epi64x(0x0303030303030303, 0x0202020202020202,0x0101010101010101, 0x0000000000000000);
__m256i andmask = _mm256_set1_epi64x(0x8040201008040201); // every 8 bits -> 8 bytes, pattern repeats.
__m256i zero256 = _mm256_setzero_si256();
__m256i masks[8];
register __m256i c256;
masks[0] = _mm256_set1_epi8(0x1);
masks[1] = _mm256_set1_epi8(0x2);
masks[2] = _mm256_set1_epi8(0x4);
masks[3] = _mm256_set1_epi8(0x8);
masks[4] = _mm256_set1_epi8(0x10);
masks[5] = _mm256_set1_epi8(0x20);
masks[6] = _mm256_set1_epi8(0x40);
masks[7] = _mm256_set1_epi8(0x80);
for (i=0; i<block_length>>5; i++) {
c256 = _mm256_and_si256(_mm256_cmpeq_epi8(_mm256_andnot_si256(_mm256_shuffle_epi8(_mm256_set1_epi32(((uint32_t*)test_input[0])[i]), shufmask),andmask),zero256),masks[0]);
for (j=1; j<n_segments; j++) {
c256 = _mm256_or_si256(_mm256_and_si256(_mm256_cmpeq_epi8(_mm256_andnot_si256(_mm256_shuffle_epi8(_mm256_set1_epi32(((uint32_t*)test_input[j])[i]), shufmask),andmask),zero256),masks[j]),c256);
}
((__m256i *)c)[i] = c256;
}
#else
AssertFatal(1==0,"Need AVX2 for this\n");
#endif
#endif
stop_meas(tinput);
if ((BG==1) || (BG==2 && Zc>64)) {
// extend matrix
start_meas(tprep);
for (i1=0; i1 < ncols; i1++)
{
memcpy(&c_extension[2*i1*Zc], &c[i1*Zc], Zc*sizeof(unsigned char));
memcpy(&c_extension[(2*i1+1)*Zc], &c[i1*Zc], Zc*sizeof(unsigned char));
}
for (i1=1;i1<simd_size;i1++) {
memcpy(&c_extension[(2*ncols*Zc*i1)], &c_extension[i1], (2*ncols*Zc*sizeof(unsigned char))-i1);
// memset(&c_extension[(2*ncols*Zc*i1)],0,i1);
/*
printf("shift %d: ",i1);
for (int j=0;j<64;j++) printf("%d ",c_extension[(2*ncols*Zc*i1)+j]);
printf("\n");
*/
}
stop_meas(tprep);
//parity check part
start_meas(tparity);
encode_parity_check_part_optim(c_extension, d, BG, Zc, Kb);
stop_meas(tparity);
}
else {
if (encode_parity_check_part_orig(c, d, BG, Zc, Kb, block_length)!=0) {
printf("Problem with encoder\n");
return(-1);
}
}
start_meas(toutput);
// information part and puncture columns
/*
memcpy(&channel_input[0], &c[2*Zc], (block_length-2*Zc)*sizeof(unsigned char));
memcpy(&channel_input[block_length-2*Zc], &d[0], ((nrows-no_punctured_columns) * Zc-removed_bit)*sizeof(unsigned char));
*/
for (i=0;i<(block_length-2*Zc);i++)
for (j=0; j<n_segments; j++)
channel_input[j][i] = (c[2*Zc+i]>>j)&1;
for (i=0;i<((nrows-no_punctured_columns) * Zc-removed_bit);i++)
for (j=0; j<n_segments; j++)
channel_input[j][block_length-2*Zc+i] = (d[i]>>j)&1;
stop_meas(toutput);
return 0;
}
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment