compiler-rt/lib/builtins/powixf2.c

   1 //===-- powixf2.cpp - Implement __powixf2 ---------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements __powixf2 for the compiler_rt library.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #if !_ARCH_PPC
  14
  15 #include "int_lib.h"
  16
  17 // Returns: a ^ b
  18
  19 COMPILER_RT_ABI xf_float __powixf2(xf_float a, int b) {
  20   const int recip = b < 0;
  21   xf_float r = 1;
  22   while (1) {
  23     if (b & 1)
  24       r *= a;
  25     b /= 2;
  26     if (b == 0)
  27       break;
  28     a *= a;
  29   }
  30   return recip ? 1 / r : r;
  31 }
  32
  33 #endif