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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 | } |