utils.c

来自「ati driver」· C语言 代码 · 共 27 行

/*
	Copyright (c) 2002, Thomas Kurschel
	

	Part of Radeon driver
		
	some utility functions
*/

#include "OS.h"
#include "utils.h"

// get ceil( log2( size ))
int log2( uint32 x )
{
	int res;
	uint32 tmp;

	for( res = 0, tmp = x ; tmp > 1 ; ++res )
		tmp >>= 1;

	if( (x & ((1 << res) - 1)) != 0 )
		++res;

	return res;
}