minix/sys/external/bsd/compiler_rt/dist/lib/ffsdi2.c
Lionel Sambuc 4684ddb6aa LLVM Minix changes
- import libcxx
 - reduce targets to the one when compiled as a tools

Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
2014-07-28 17:05:59 +02:00

33 lines
939 B
C

/* ===-- ffsdi2.c - Implement __ffsdi2 -------------------------------------===
*
* 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 __ffsdi2 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
/* Returns: the index of the least significant 1-bit in a, or
* the value zero if a is zero. The least significant bit is index one.
*/
COMPILER_RT_ABI si_int
__ffsdi2(di_int a)
{
dwords x;
x.all = a;
if (x.s.low == 0)
{
if (x.s.high == 0)
return 0;
return __builtin_ctz(x.s.high) + (1 + sizeof(si_int) * CHAR_BIT);
}
return __builtin_ctz(x.s.low) + 1;
}