4684ddb6aa
- import libcxx - reduce targets to the one when compiled as a tools Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
34 lines
939 B
C
34 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;
|
|
}
|