34 lines
887 B
C
34 lines
887 B
C
/* ===-- clzti2.c - Implement __clzti2 -------------------------------------===
|
|
*
|
|
* The LLVM Compiler Infrastructure
|
|
*
|
|
* This file is dual licensed under the MIT and the University of Illinois Open
|
|
* Source Licenses. See LICENSE.TXT for details.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*
|
|
* This file implements __clzti2 for the compiler_rt library.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*/
|
|
|
|
#include "int_lib.h"
|
|
|
|
#ifdef CRT_HAS_128BIT
|
|
|
|
/* Returns: the number of leading 0-bits */
|
|
|
|
/* Precondition: a != 0 */
|
|
|
|
COMPILER_RT_ABI si_int
|
|
__clzti2(ti_int a)
|
|
{
|
|
twords x;
|
|
x.all = a;
|
|
const di_int f = -(x.s.high == 0);
|
|
return __builtin_clzll((x.s.high & ~f) | (x.s.low & f)) +
|
|
((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT)));
|
|
}
|
|
|
|
#endif /* CRT_HAS_128BIT */
|