1 //===-- divtc3.c - Implement __divtc3 -------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file implements __divtc3 for the compiler_rt library. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #define QUAD_PRECISION 14 #include "fp_lib.h" 15 16 #if defined(CRT_HAS_128BIT) && defined(CRT_HAS_F128) 17 18 // Returns: the quotient of (a + ib) / (c + id) 19 20 COMPILER_RT_ABI Qcomplex __divtc3(fp_t __a, fp_t __b, fp_t __c, fp_t __d) { 21 int __ilogbw = 0; 22 fp_t __logbw = __compiler_rt_logbtf( 23 __compiler_rt_fmaxtf(crt_fabstf(__c), crt_fabstf(__d))); 24 if (crt_isfinite(__logbw)) { 25 __ilogbw = (int)__logbw; 26 __c = __compiler_rt_scalbntf(__c, -__ilogbw); 27 __d = __compiler_rt_scalbntf(__d, -__ilogbw); 28 } 29 fp_t __denom = __c * __c + __d * __d; 30 Qcomplex z; 31 COMPLEXTF_REAL(z) = 32 __compiler_rt_scalbntf((__a * __c + __b * __d) / __denom, -__ilogbw); 33 COMPLEXTF_IMAGINARY(z) = 34 __compiler_rt_scalbntf((__b * __c - __a * __d) / __denom, -__ilogbw); 35 if (crt_isnan(COMPLEXTF_REAL(z)) && crt_isnan(COMPLEXTF_IMAGINARY(z))) { 36 if ((__denom == 0.0) && (!crt_isnan(__a) || !crt_isnan(__b))) { 37 COMPLEXTF_REAL(z) = crt_copysigntf(CRT_INFINITY, __c) * __a; 38 COMPLEXTF_IMAGINARY(z) = crt_copysigntf(CRT_INFINITY, __c) * __b; 39 } else if ((crt_isinf(__a) || crt_isinf(__b)) && crt_isfinite(__c) && 40 crt_isfinite(__d)) { 41 __a = crt_copysigntf(crt_isinf(__a) ? (fp_t)1.0 : (fp_t)0.0, __a); 42 __b = crt_copysigntf(crt_isinf(__b) ? (fp_t)1.0 : (fp_t)0.0, __b); 43 COMPLEXTF_REAL(z) = CRT_INFINITY * (__a * __c + __b * __d); 44 COMPLEXTF_IMAGINARY(z) = CRT_INFINITY * (__b * __c - __a * __d); 45 } else if (crt_isinf(__logbw) && __logbw > 0.0 && crt_isfinite(__a) && 46 crt_isfinite(__b)) { 47 __c = crt_copysigntf(crt_isinf(__c) ? (fp_t)1.0 : (fp_t)0.0, __c); 48 __d = crt_copysigntf(crt_isinf(__d) ? (fp_t)1.0 : (fp_t)0.0, __d); 49 COMPLEXTF_REAL(z) = 0.0 * (__a * __c + __b * __d); 50 COMPLEXTF_IMAGINARY(z) = 0.0 * (__b * __c - __a * __d); 51 } 52 } 53 return z; 54 } 55 56 #endif 57