38 lines
910 B
C
38 lines
910 B
C
/* clang-format off */
|
|
/* ===-- powidf2.cpp - Implement __powidf2 ---------------------------------===
|
|
*
|
|
* The LLVM Compiler Infrastructure
|
|
*
|
|
* This file is dual licensed under the MIT and the University of Illinois Open
|
|
* Source Licenses. See LICENSE.TXT for details.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*
|
|
* This file implements __powidf2 for the compiler_rt library.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*/
|
|
|
|
STATIC_YOINK("huge_compiler_rt_license");
|
|
|
|
#include "third_party/compiler_rt/int_lib.h"
|
|
|
|
/* Returns: a ^ b */
|
|
|
|
COMPILER_RT_ABI double
|
|
__powidf2(double a, si_int b)
|
|
{
|
|
const int recip = b < 0;
|
|
double r = 1;
|
|
while (1)
|
|
{
|
|
if (b & 1)
|
|
r *= a;
|
|
b /= 2;
|
|
if (b == 0)
|
|
break;
|
|
a *= a;
|
|
}
|
|
return recip ? 1/r : r;
|
|
}
|