1 /* ===-- divxc3.c - Implement __divxc3 -------------------------------------=== 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 __divxc3 for the compiler_rt library. 11 * 12 */ 13 14 #if !_ARCH_PPC 15 16 #include "int_lib.h" 17 #include <math.h> 18 #include <complex.h> 19 20 /* Returns: the quotient of (a + ib) / (c + id) */ 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 63
