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      1 /* ===-- powixf2.cpp - Implement __powixf2 ---------------------------------===
      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 __powixf2 for the compiler_rt library.
     11  *
     12  * ===----------------------------------------------------------------------===
     13  */
     14 
     15 #if !_ARCH_PPC
     16 
     17 #include "int_lib.h"
     18 
     19 /* Returns: a ^ b */
     20 
     21 COMPILER_RT_ABI long double
     22 __powixf2(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