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fix for log2_approx to approximate to the nearest neighbor, instead of ceil

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francescomani
2024-09-23 17:56:50 +02:00
parent 385999dc5e
commit d304865489
1 changed files with 23 additions and 33 deletions
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openair1/PHY/TOOLS/log2_approx.c
+23 -33
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@@ -21,56 +21,46 @@
unsigned char log2_approx(unsigned int x) unsigned char log2_approx(unsigned int x)
{ {
unsigned char l2 = 0;
unsigned int tmp = x >> 1;
int i; while (tmp) {
unsigned char l2; l2++;
tmp >>= 1;
}
l2=0; if (l2)
l2 += (x >> (l2 - 1)) & 1;
for (i=0; i<31; i++) return l2;
if ((x&(1<<i)) != 0)
l2 = i+1;
//l2 = i;
// printf("log2_approx = %d\n",l2);
return(l2);
} }
unsigned char factor2(unsigned int x) unsigned char factor2(unsigned int x)
{ {
unsigned char l2 = 0;
int i; int i;
unsigned char l2; for (i = 0; i < 31; i++)
if ((x & (1 << i)) != 0)
l2=0;
for (i=0; i<31; i++)
if ((x&(1<<i)) != 0)
break; break;
l2 = i; l2 = i;
return l2;
//printf("factor2(%d) = %d\n",x,l2);
return(l2);
} }
unsigned char log2_approx64(unsigned long long int x) unsigned char log2_approx64(unsigned long long int x)
{ {
unsigned char l2 = 0;
unsigned long long int tmp = x >> 1;
int i; while (tmp) {
unsigned char l2; l2++;
tmp >>= 1;
}
l2=0; if (l2)
l2 += (x >> (l2 - 1)) & 1;
for (i=0; i<63; i++) return l2;
if ((x&(((long long int) 1)<<i)) != 0)
// l2 = i+1;
l2 = i;
// printf("log2_approx = %d\n",l2);
return(l2);
} }