| Daniel Dunbar | fd08999 | 2009-06-26 16:47:03 +0000 | [diff] [blame^] | 1 | //===-- muldc3.c - Implement __muldc3 -------------------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file implements __muldc3 for the compiler_rt library. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "int_lib.h" |
| 15 | #include <math.h> |
| 16 | #include <complex.h> |
| 17 | |
| 18 | // Returns: the product of a + ib and c + id |
| 19 | |
| 20 | double _Complex |
| 21 | __muldc3(double __a, double __b, double __c, double __d) |
| 22 | { |
| 23 | double __ac = __a * __c; |
| 24 | double __bd = __b * __d; |
| 25 | double __ad = __a * __d; |
| 26 | double __bc = __b * __c; |
| 27 | double _Complex z; |
| 28 | __real__ z = __ac - __bd; |
| 29 | __imag__ z = __ad + __bc; |
| 30 | if (isnan(__real__ z) && isnan(__imag__ z)) |
| 31 | { |
| 32 | int __recalc = 0; |
| 33 | if (isinf(__a) || isinf(__b)) |
| 34 | { |
| 35 | __a = copysign(isinf(__a) ? 1 : 0, __a); |
| 36 | __b = copysign(isinf(__b) ? 1 : 0, __b); |
| 37 | if (isnan(__c)) |
| 38 | __c = copysign(0, __c); |
| 39 | if (isnan(__d)) |
| 40 | __d = copysign(0, __d); |
| 41 | __recalc = 1; |
| 42 | } |
| 43 | if (isinf(__c) || isinf(__d)) |
| 44 | { |
| 45 | __c = copysign(isinf(__c) ? 1 : 0, __c); |
| 46 | __d = copysign(isinf(__d) ? 1 : 0, __d); |
| 47 | if (isnan(__a)) |
| 48 | __a = copysign(0, __a); |
| 49 | if (isnan(__b)) |
| 50 | __b = copysign(0, __b); |
| 51 | __recalc = 1; |
| 52 | } |
| 53 | if (!__recalc && (isinf(__ac) || isinf(__bd) || |
| 54 | isinf(__ad) || isinf(__bc))) |
| 55 | { |
| 56 | if (isnan(__a)) |
| 57 | __a = copysign(0, __a); |
| 58 | if (isnan(__b)) |
| 59 | __b = copysign(0, __b); |
| 60 | if (isnan(__c)) |
| 61 | __c = copysign(0, __c); |
| 62 | if (isnan(__d)) |
| 63 | __d = copysign(0, __d); |
| 64 | __recalc = 1; |
| 65 | } |
| 66 | if (__recalc) |
| 67 | { |
| 68 | __real__ z = INFINITY * (__a * __c - __b * __d); |
| 69 | __imag__ z = INFINITY * (__a * __d + __b * __c); |
| 70 | } |
| 71 | } |
| 72 | return z; |
| 73 | } |