powitf2.c revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1/* ===-- powitf2.cpp - Implement __powitf2 ---------------------------------===
2 *
3 *                     The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __powitf2 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16
17#if _ARCH_PPC
18
19/* Returns: a ^ b */
20
21COMPILER_RT_ABI long double
22__powitf2(long double a, si_int b)
23{
24    const int recip = b < 0;
25    long double r = 1;
26    while (1)
27    {
28        if (b & 1)
29            r *= a;
30        b /= 2;
31        if (b == 0)
32            break;
33        a *= a;
34    }
35    return recip ? 1/r : r;
36}
37
38#endif
39