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#include <ccan/ilog/ilog.h>
#include <ccan/ilog/ilog.c>
#include <stdio.h>
#include <ccan/tap/tap.h>
/*Dead simple (but slow) versions to compare against.*/
static int test_ilog32(uint32_t _v){
int ret;
for(ret=0;_v;ret++)_v>>=1;
return ret;
}
static int test_ilog64(uint64_t _v){
int ret;
for(ret=0;_v;ret++)_v>>=1;
return ret;
}
#define NTRIALS (64)
int main(int _argc,const char *_argv[]){
int i;
int j;
int (*il32)(uint32_t) = ilog32;
int (*il64)(uint64_t) = ilog64;
int (*il32_nz)(uint32_t) = ilog32_nz;
int (*il64_nz)(uint64_t) = ilog64_nz;
/*This is how many tests you plan to run.*/
plan_tests(33 * NTRIALS * 3 + 65 * NTRIALS * 3);
for(i=0;i<=32;i++){
uint32_t v;
/*Test each bit in turn (and 0).*/
v=i?(uint32_t)1U<<(i-1):0;
for(j=0;j<NTRIALS;j++){
int l;
l=test_ilog32(v);
ok1(STATIC_ILOG_32(v)==l);
ok1(il32(v)==l);
ok1(il32_nz(v) == l || v == 0);
/*Also try a few more pseudo-random values with at most the same number
of bits.*/
v=(1103515245U*v+12345U)&0xFFFFFFFFU>>((33-i)>>1)>>((32-i)>>1);
}
}
for(i=0;i<=64;i++){
uint64_t v;
/*Test each bit in turn (and 0).*/
v=i?(uint64_t)1U<<(i-1):0;
for(j=0;j<NTRIALS;j++){
int l;
l=test_ilog64(v);
ok1(STATIC_ILOG_64(v)==l);
ok1(il64(v)==l);
ok1(il64_nz(v) == l || v == 0);
/*Also try a few more pseudo-random values with at most the same number
of bits.*/
v=(uint64_t)((2862933555777941757ULL*v+3037000493ULL)
&0xFFFFFFFFFFFFFFFFULL>>((65-i)>>1)>>((64-i)>>1));
}
}
return exit_status();
}
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