compiler-rt/lib/builtins/powitf2.c

   1 //===-- powitf2.cpp - Implement __powitf2 ---------------------------------===//
   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 __powitf2 for the compiler_rt library.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #define QUAD_PRECISION
  14 #include "fp_lib.h"
  15
  16 #if defined(CRT_HAS_TF_MODE)
  17
  18 // Returns: a ^ b
  19
  20 COMPILER_RT_ABI fp_t __powitf2(fp_t a, int b) {
  21   const int recip = b < 0;
  22   fp_t r = 1;
  23   while (1) {
  24     if (b & 1)
  25       r *= a;
  26     b /= 2;
  27     if (b == 0)
  28       break;
  29     a *= a;
  30   }
  31   return recip ? 1 / r : r;
  32 }
  33
  34 #endif