1 /* ===-- muldc3.c - Implement __muldc3 -------------------------------------=== 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 __muldc3 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 #include "int_math.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 (crt_isnan(__real__ z) && crt_isnan(__imag__ z)) 31 { 32 int __recalc = 0; 33 if (crt_isinf(__a) || crt_isinf(__b)) 34 { 35 __a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a); 36 __b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b); 37 if (crt_isnan(__c)) 38 __c = crt_copysign(0, __c); 39 if (crt_isnan(__d)) 40 __d = crt_copysign(0, __d); 41 __recalc = 1; 42 } 43 if (crt_isinf(__c) || crt_isinf(__d)) 44 { 45 __c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c); 46 __d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d); 47 if (crt_isnan(__a)) 48 __a = crt_copysign(0, __a); 49 if (crt_isnan(__b)) 50 __b = crt_copysign(0, __b); 51 __recalc = 1; 52 } 53 if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || 54 crt_isinf(__ad) || crt_isinf(__bc))) 55 { 56 if (crt_isnan(__a)) 57 __a = crt_copysign(0, __a); 58 if (crt_isnan(__b)) 59 __b = crt_copysign(0, __b); 60 if (crt_isnan(__c)) 61 __c = crt_copysign(0, __c); 62 if (crt_isnan(__d)) 63 __d = crt_copysign(0, __d); 64 __recalc = 1; 65 } 66 if (__recalc) 67 { 68 __real__ z = CRT_INFINITY * (__a * __c - __b * __d); 69 __imag__ z = CRT_INFINITY * (__a * __d + __b * __c); 70 } 71 } 72 return z; 73 } 74
