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      1 /*===-- powisf2.cpp - Implement __powisf2 ---------------------------------===
      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 __powisf2 for the compiler_rt library.
     11  *
     12  * ===----------------------------------------------------------------------===
     13  */
     14 
     15 #include "int_lib.h"
     16 
     17 /* Returns: a ^ b */
     18 
     19 COMPILER_RT_ABI float
     20 __powisf2(float a, si_int b)
     21 {
     22     const int recip = b < 0;
     23     float r = 1;
     24     while (1)
     25     {
     26         if (b & 1)
     27             r *= a;
     28         b /= 2;
     29         if (b == 0)
     30             break;
     31         a *= a;
     32     }
     33     return recip ? 1/r : r;
     34 }
     35