1 /*===-- divtc3.c - Implement __divtc3 -------------------------------------=== 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 __divtc3 for the compiler_rt library. 11 * 12 *===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 #include "int_math.h" 17 18 /* Returns: the quotient of (a + ib) / (c + id) */ 19 20 COMPILER_RT_ABI long double _Complex 21 __divtc3(long double __a, long double __b, long double __c, long double __d) 22 { 23 int __ilogbw = 0; 24 long double __logbw = crt_logbl(crt_fmaxl(crt_fabsl(__c), crt_fabsl(__d))); 25 if (crt_isfinite(__logbw)) 26 { 27 __ilogbw = (int)__logbw; 28 __c = crt_scalbnl(__c, -__ilogbw); 29 __d = crt_scalbnl(__d, -__ilogbw); 30 } 31 long double __denom = __c * __c + __d * __d; 32 long double _Complex z; 33 __real__ z = crt_scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw); 34 __imag__ z = crt_scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw); 35 if (crt_isnan(__real__ z) && crt_isnan(__imag__ z)) 36 { 37 if ((__denom == 0.0) && (!crt_isnan(__a) || !crt_isnan(__b))) 38 { 39 __real__ z = crt_copysignl(CRT_INFINITY, __c) * __a; 40 __imag__ z = crt_copysignl(CRT_INFINITY, __c) * __b; 41 } 42 else if ((crt_isinf(__a) || crt_isinf(__b)) && 43 crt_isfinite(__c) && crt_isfinite(__d)) 44 { 45 __a = crt_copysignl(crt_isinf(__a) ? 1.0 : 0.0, __a); 46 __b = crt_copysignl(crt_isinf(__b) ? 1.0 : 0.0, __b); 47 __real__ z = CRT_INFINITY * (__a * __c + __b * __d); 48 __imag__ z = CRT_INFINITY * (__b * __c - __a * __d); 49 } 50 else if (crt_isinf(__logbw) && __logbw > 0.0 && 51 crt_isfinite(__a) && crt_isfinite(__b)) 52 { 53 __c = crt_copysignl(crt_isinf(__c) ? 1.0 : 0.0, __c); 54 __d = crt_copysignl(crt_isinf(__d) ? 1.0 : 0.0, __d); 55 __real__ z = 0.0 * (__a * __c + __b * __d); 56 __imag__ z = 0.0 * (__b * __c - __a * __d); 57 } 58 } 59 return z; 60 } 61
