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
21 COMPILER_RT_ABI long double
__powitf2(long double a,si_int b)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