powitf2.c revision 303975
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