Espresso/lib/math.c

#include <types.h>

#include <math.h>


static int ps_of_two[12] = { 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096 };

bool is_low_power_of_two(int n)
{
  for (int i = 0; i < 11; i++)
  {
    if (n == ps_of_two[i])
    {
      return true;
    }
  }
  
  return false;
}

uint64_t int_pow(uint64_t base, uint32_t exp)
{
  uint64_t result = 1;

  while (exp)
  {
    if (exp & 1)
    {
      result *= base;
    }
    
    exp >>= 1;
    base *= base;
  }

  return result;
}


int abs(int x)
{
    return (x < 0) ? -x : x;
}