1214152Sed/*===-- divsc3.c - Implement __divsc3 -------------------------------------=== 2214152Sed * 3214152Sed * The LLVM Compiler Infrastructure 4214152Sed * 5222656Sed * This file is dual licensed under the MIT and the University of Illinois Open 6222656Sed * Source Licenses. See LICENSE.TXT for details. 7214152Sed * 8214152Sed * ===----------------------------------------------------------------------=== 9214152Sed * 10214152Sed * This file implements __divsc3 for the compiler_rt library. 11214152Sed * 12214152Sed *===----------------------------------------------------------------------=== 13214152Sed */ 14214152Sed 15214152Sed#include "int_lib.h" 16229135Sed#include "int_math.h" 17214152Sed 18214152Sed/* Returns: the quotient of (a + ib) / (c + id) */ 19214152Sed 20214152Sedfloat _Complex 21214152Sed__divsc3(float __a, float __b, float __c, float __d) 22214152Sed{ 23214152Sed int __ilogbw = 0; 24229135Sed float __logbw = crt_logbf(crt_fmaxf(crt_fabsf(__c), crt_fabsf(__d))); 25229135Sed if (crt_isfinite(__logbw)) 26214152Sed { 27214152Sed __ilogbw = (int)__logbw; 28229135Sed __c = crt_scalbnf(__c, -__ilogbw); 29229135Sed __d = crt_scalbnf(__d, -__ilogbw); 30214152Sed } 31214152Sed float __denom = __c * __c + __d * __d; 32214152Sed float _Complex z; 33229135Sed __real__ z = crt_scalbnf((__a * __c + __b * __d) / __denom, -__ilogbw); 34229135Sed __imag__ z = crt_scalbnf((__b * __c - __a * __d) / __denom, -__ilogbw); 35229135Sed if (crt_isnan(__real__ z) && crt_isnan(__imag__ z)) 36214152Sed { 37229135Sed if ((__denom == 0) && (!crt_isnan(__a) || !crt_isnan(__b))) 38214152Sed { 39229135Sed __real__ z = crt_copysignf(CRT_INFINITY, __c) * __a; 40229135Sed __imag__ z = crt_copysignf(CRT_INFINITY, __c) * __b; 41214152Sed } 42229135Sed else if ((crt_isinf(__a) || crt_isinf(__b)) && 43229135Sed crt_isfinite(__c) && crt_isfinite(__d)) 44214152Sed { 45229135Sed __a = crt_copysignf(crt_isinf(__a) ? 1 : 0, __a); 46229135Sed __b = crt_copysignf(crt_isinf(__b) ? 1 : 0, __b); 47229135Sed __real__ z = CRT_INFINITY * (__a * __c + __b * __d); 48229135Sed __imag__ z = CRT_INFINITY * (__b * __c - __a * __d); 49214152Sed } 50229135Sed else if (crt_isinf(__logbw) && __logbw > 0 && 51229135Sed crt_isfinite(__a) && crt_isfinite(__b)) 52214152Sed { 53229135Sed __c = crt_copysignf(crt_isinf(__c) ? 1 : 0, __c); 54229135Sed __d = crt_copysignf(crt_isinf(__d) ? 1 : 0, __d); 55214152Sed __real__ z = 0 * (__a * __c + __b * __d); 56214152Sed __imag__ z = 0 * (__b * __c - __a * __d); 57214152Sed } 58214152Sed } 59214152Sed return z; 60214152Sed} 61