Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 1 | /* ===-- divxc3.c - Implement __divxc3 -------------------------------------=== |
| 2 | * |
| 3 | * The LLVM Compiler Infrastructure |
| 4 | * |
Howard Hinnant | 9ad441f | 2010-11-16 22:13:33 +0000 | [diff] [blame^] | 5 | * This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | * Source Licenses. See LICENSE.TXT for details. |
Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 7 | * |
| 8 | * ===----------------------------------------------------------------------=== |
| 9 | * |
| 10 | * This file implements __divxc3 for the compiler_rt library. |
| 11 | * |
| 12 | */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 13 | |
| 14 | #if !_ARCH_PPC |
| 15 | |
| 16 | #include "int_lib.h" |
| 17 | #include <math.h> |
| 18 | #include <complex.h> |
| 19 | |
Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 20 | /* Returns: the quotient of (a + ib) / (c + id) */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 21 | |
| 22 | long double _Complex |
| 23 | __divxc3(long double __a, long double __b, long double __c, long double __d) |
| 24 | { |
| 25 | int __ilogbw = 0; |
| 26 | long double __logbw = logbl(fmaxl(fabsl(__c), fabsl(__d))); |
| 27 | if (isfinite(__logbw)) |
| 28 | { |
| 29 | __ilogbw = (int)__logbw; |
| 30 | __c = scalbnl(__c, -__ilogbw); |
| 31 | __d = scalbnl(__d, -__ilogbw); |
| 32 | } |
| 33 | long double __denom = __c * __c + __d * __d; |
| 34 | long double _Complex z; |
| 35 | __real__ z = scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw); |
| 36 | __imag__ z = scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw); |
| 37 | if (isnan(__real__ z) && isnan(__imag__ z)) |
| 38 | { |
| 39 | if ((__denom == 0) && (!isnan(__a) || !isnan(__b))) |
| 40 | { |
| 41 | __real__ z = copysignl(INFINITY, __c) * __a; |
| 42 | __imag__ z = copysignl(INFINITY, __c) * __b; |
| 43 | } |
| 44 | else if ((isinf(__a) || isinf(__b)) && isfinite(__c) && isfinite(__d)) |
| 45 | { |
| 46 | __a = copysignl(isinf(__a) ? 1 : 0, __a); |
| 47 | __b = copysignl(isinf(__b) ? 1 : 0, __b); |
| 48 | __real__ z = INFINITY * (__a * __c + __b * __d); |
| 49 | __imag__ z = INFINITY * (__b * __c - __a * __d); |
| 50 | } |
| 51 | else if (isinf(__logbw) && __logbw > 0 && isfinite(__a) && isfinite(__b)) |
| 52 | { |
| 53 | __c = copysignl(isinf(__c) ? 1 : 0, __c); |
| 54 | __d = copysignl(isinf(__d) ? 1 : 0, __d); |
| 55 | __real__ z = 0 * (__a * __c + __b * __d); |
| 56 | __imag__ z = 0 * (__b * __c - __a * __d); |
| 57 | } |
| 58 | } |
| 59 | return z; |
| 60 | } |
| 61 | |
| 62 | #endif |