| Edward O'Callaghan | 1fcb40b | 2009-08-05 19:06:50 +0000 | [diff] [blame] | 1 | /* ===-- mulxc3.c - Implement __mulxc3 -------------------------------------=== |
| 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 | 1fcb40b | 2009-08-05 19:06:50 +0000 | [diff] [blame] | 7 | * |
| 8 | * ===----------------------------------------------------------------------=== |
| 9 | * |
| 10 | * This file implements __mulxc3 for the compiler_rt library. |
| 11 | * |
| 12 | * ===----------------------------------------------------------------------=== |
| 13 | */ |
| Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 14 | |
| 15 | #if !_ARCH_PPC |
| 16 | |
| 17 | #include "int_lib.h" |
| 18 | #include <math.h> |
| Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 19 | |
| Edward O'Callaghan | 1fcb40b | 2009-08-05 19:06:50 +0000 | [diff] [blame] | 20 | /* Returns: the product of a + ib and c + id */ |
| Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 21 | |
| 22 | long double _Complex |
| 23 | __mulxc3(long double __a, long double __b, long double __c, long double __d) |
| 24 | { |
| 25 | long double __ac = __a * __c; |
| 26 | long double __bd = __b * __d; |
| 27 | long double __ad = __a * __d; |
| 28 | long double __bc = __b * __c; |
| 29 | long double _Complex z; |
| 30 | __real__ z = __ac - __bd; |
| 31 | __imag__ z = __ad + __bc; |
| 32 | if (isnan(__real__ z) && isnan(__imag__ z)) |
| 33 | { |
| 34 | int __recalc = 0; |
| 35 | if (isinf(__a) || isinf(__b)) |
| 36 | { |
| 37 | __a = copysignl(isinf(__a) ? 1 : 0, __a); |
| 38 | __b = copysignl(isinf(__b) ? 1 : 0, __b); |
| 39 | if (isnan(__c)) |
| 40 | __c = copysignl(0, __c); |
| 41 | if (isnan(__d)) |
| 42 | __d = copysignl(0, __d); |
| 43 | __recalc = 1; |
| 44 | } |
| 45 | if (isinf(__c) || isinf(__d)) |
| 46 | { |
| 47 | __c = copysignl(isinf(__c) ? 1 : 0, __c); |
| 48 | __d = copysignl(isinf(__d) ? 1 : 0, __d); |
| 49 | if (isnan(__a)) |
| 50 | __a = copysignl(0, __a); |
| 51 | if (isnan(__b)) |
| 52 | __b = copysignl(0, __b); |
| 53 | __recalc = 1; |
| 54 | } |
| 55 | if (!__recalc && (isinf(__ac) || isinf(__bd) || |
| 56 | isinf(__ad) || isinf(__bc))) |
| 57 | { |
| 58 | if (isnan(__a)) |
| 59 | __a = copysignl(0, __a); |
| 60 | if (isnan(__b)) |
| 61 | __b = copysignl(0, __b); |
| 62 | if (isnan(__c)) |
| 63 | __c = copysignl(0, __c); |
| 64 | if (isnan(__d)) |
| 65 | __d = copysignl(0, __d); |
| 66 | __recalc = 1; |
| 67 | } |
| 68 | if (__recalc) |
| 69 | { |
| 70 | __real__ z = INFINITY * (__a * __c - __b * __d); |
| 71 | __imag__ z = INFINITY * (__a * __d + __b * __c); |
| 72 | } |
| 73 | } |
| 74 | return z; |
| 75 | } |
| 76 | |
| 77 | #endif |