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1//===-- divsc3.c - Implement __divsc3 -------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8//9// This file implements __divsc3 for the compiler_rt library.10//11//===----------------------------------------------------------------------===//12 13#define SINGLE_PRECISION14#include "fp_lib.h"15#include "int_lib.h"16#include "int_math.h"17 18// Returns: the quotient of (a + ib) / (c + id)19 20COMPILER_RT_ABI Fcomplex __divsc3(float __a, float __b, float __c, float __d) {21 int __ilogbw = 0;22 float __logbw =23 __compiler_rt_logbf(__compiler_rt_fmaxX(crt_fabsf(__c), crt_fabsf(__d)));24 if (crt_isfinite(__logbw)) {25 __ilogbw = (int)__logbw;26 __c = __compiler_rt_scalbnf(__c, -__ilogbw);27 __d = __compiler_rt_scalbnf(__d, -__ilogbw);28 }29 float __denom = __c * __c + __d * __d;30 Fcomplex z;31 COMPLEX_REAL(z) =32 __compiler_rt_scalbnf((__a * __c + __b * __d) / __denom, -__ilogbw);33 COMPLEX_IMAGINARY(z) =34 __compiler_rt_scalbnf((__b * __c - __a * __d) / __denom, -__ilogbw);35 if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {36 if ((__denom == 0) && (!crt_isnan(__a) || !crt_isnan(__b))) {37 COMPLEX_REAL(z) = crt_copysignf(CRT_INFINITY, __c) * __a;38 COMPLEX_IMAGINARY(z) = crt_copysignf(CRT_INFINITY, __c) * __b;39 } else if ((crt_isinf(__a) || crt_isinf(__b)) && crt_isfinite(__c) &&40 crt_isfinite(__d)) {41 __a = crt_copysignf(crt_isinf(__a) ? 1 : 0, __a);42 __b = crt_copysignf(crt_isinf(__b) ? 1 : 0, __b);43 COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c + __b * __d);44 COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__b * __c - __a * __d);45 } else if (crt_isinf(__logbw) && __logbw > 0 && crt_isfinite(__a) &&46 crt_isfinite(__b)) {47 __c = crt_copysignf(crt_isinf(__c) ? 1 : 0, __c);48 __d = crt_copysignf(crt_isinf(__d) ? 1 : 0, __d);49 COMPLEX_REAL(z) = 0 * (__a * __c + __b * __d);50 COMPLEX_IMAGINARY(z) = 0 * (__b * __c - __a * __d);51 }52 }53 return z;54}55