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[pipepar] Compute a CRC 8bit in lattice.c 

* Change number of bits in CRC to 8
* Avoid q to be higher than 2^CRC_BIT
* Increase the number of packets when benchmarking lattice.c
This commit is contained in:
Thomas Preud'homme 2012-09-07 11:57:27 +02:00
parent e4450d68c2
commit eab2df2a38
2 changed files with 5 additions and 5 deletions
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4
pipepar/Makefile
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@ -46,8 +46,8 @@ lattice-prog-%: lattice.c
runlattice%: lattice-%
mkdir -p logs
./$< -p 50 2>/dev/null
$(call runntimesandlog,10,./$< -p 50,logs/$<-$$(date +%Y-%m-%d_%H-%M-%S).log)
./$< -p 10000 2>/dev/null
$(call runntimesandlog,10,./$< -p 10000,logs/$<-$$(date +%Y-%m-%d_%H-%M-%S).log)
pipeline_template-prog-%: pipeline_template.c
NUM=$*;OPT=-$*;gcc $(CFLAGS) -DNB_CORES=$${NUM##*-} $${OPT%-*} -o $@ $< -lrt

6
pipepar/lattice.c
View File

@ -24,8 +24,8 @@
#define AAC_SCE_PROT_BIT 192
#define AAC_SCE_PROT_PER_CORE_BIT (AAC_SCE_PROT_BIT / NB_CORES)
/* CRC CCITT-16 size */
#define CRC_BIT 16
/* CRC CCITT-8 size? */
#define CRC_BIT 8
#define DATA_BITS_PER_CORE ((AAC_SCE_PROT_BIT - 1) / NB_CORES)
@ -202,7 +202,7 @@ inline void compute_cumulative_metrics_column(
for(jf = 0; jf < (1 << CRC_BIT); jf++)
{
uint_fast16_t j = (uint_fast16_t) jf;
uint_fast16_t q = j ^ p_matrix;
uint_fast16_t q = (j ^ p_matrix) & ((1 << CRC_BIT) - 1);
lattice_metrics_out[j] = jacolog(lattice_metrics_in[j] + bit_metrics, lattice_metrics_out[j]);
lattice_metrics_out[q] = jacolog(lattice_metrics_in[j] - bit_metrics, lattice_metrics_out[q]);
n = jacolog(lattice_metrics_out[j], n);