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TurboPFor: Elias fano encode/decode

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2017-01-05 12:51:37 +01:00
parent 75c45687a1
commit 757030078e
1 changed files with 8 additions and 21 deletions
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29
eliasfano.c
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@ -90,7 +90,7 @@ static inline unsigned long long blsr(unsigned long long x) { return x & (x - 1)
#undef EFANODEC
//----------------------
#define EFSIMD
#define VSIZE 128
#define BITPACK bitpack128v
#define BITUNPACK bitunpack128v
#define EF_INC 1
@ -101,10 +101,6 @@ static inline unsigned long long blsr(unsigned long long x) { return x & (x - 1)
#include __FILE__
#undef USIZE
/*#define USIZE 16
#include __FILE__
#undef USIZE*/
#undef EF_INC
#undef EFANOENC
#undef EFANODEC
@ -117,14 +113,11 @@ static inline unsigned long long blsr(unsigned long long x) { return x & (x - 1)
#define USIZE 32
#include __FILE__
#undef USIZE
#undef EFSIMD
/*#define USIZE 16
#include __FILE__
#undef USIZE*/
#undef VSIZE
#else //--------------------------------------------- implementation ---------------------------------------------------------------
#define uint_t TEMPLATE3(uint, USIZE, _t)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wparentheses"
@ -145,11 +138,7 @@ unsigned char *TEMPLATE2(EFANOENC, USIZE)(uint_t *__restrict in, unsigned n, uns
}
while(i < n) pa[i] = EFE(in,i,start) & x, ++i;
*out = lb+1;
op = TEMPLATE2(BITPACK,USIZE)(pa,
#ifndef EFSIMD
n,
#endif
out+1, lb);
op = TEMPLATE2(BITPACK,USIZE)(pa, n, out+1, lb);
memset(op, 0, hl);
for(i = 0; i != n&~3; ) {
@ -163,7 +152,9 @@ unsigned char *TEMPLATE2(EFANOENC, USIZE)(uint_t *__restrict in, unsigned n, uns
}
unsigned char *TEMPLATE2(EFANODEC, USIZE)(unsigned char *__restrict in, unsigned n, uint_t *__restrict out, uint_t start) {
if(!n) return in;
if(!n) return out;
unsigned char *ip = in;
unsigned i,j,lb = *ip++;
bit_t b;
@ -181,11 +172,7 @@ unsigned char *TEMPLATE2(EFANODEC, USIZE)(unsigned char *__restrict in, unsigned
return ip;
}
ip = TEMPLATE2(BITUNPACK,USIZE)(ip,
#ifndef EFSIMD
n,
#endif
out, --lb);
ip = TEMPLATE2(BITUNPACK,USIZE)(ip, n, out, --lb);
for(i=j=0;; j += sizeof(bit_t)*8)
for(b = *(bit_t *)(ip+(j>>3)); ; ) {
if(!b) break; out[i] += ((uint_t)(j+ctz64(b)-i) << lb) + start+i*EF_INC; b = blsr(b); i++;