56 lines
2.2 KiB
C
56 lines
2.2 KiB
C
//===-- divxc3.c - Implement __divxc3 -------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements __divxc3 for the compiler_rt library.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#if !_ARCH_PPC
|
|
|
|
#include "int_lib.h"
|
|
#include "int_math.h"
|
|
|
|
// Returns: the quotient of (a + ib) / (c + id)
|
|
|
|
COMPILER_RT_ABI Lcomplex __divxc3(long double __a, long double __b,
|
|
long double __c, long double __d) {
|
|
int __ilogbw = 0;
|
|
long double __logbw = crt_logbl(crt_fmaxl(crt_fabsl(__c), crt_fabsl(__d)));
|
|
if (crt_isfinite(__logbw)) {
|
|
__ilogbw = (int)__logbw;
|
|
__c = crt_scalbnl(__c, -__ilogbw);
|
|
__d = crt_scalbnl(__d, -__ilogbw);
|
|
}
|
|
long double __denom = __c * __c + __d * __d;
|
|
Lcomplex z;
|
|
COMPLEX_REAL(z) = crt_scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw);
|
|
COMPLEX_IMAGINARY(z) =
|
|
crt_scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw);
|
|
if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
|
|
if ((__denom == 0) && (!crt_isnan(__a) || !crt_isnan(__b))) {
|
|
COMPLEX_REAL(z) = crt_copysignl(CRT_INFINITY, __c) * __a;
|
|
COMPLEX_IMAGINARY(z) = crt_copysignl(CRT_INFINITY, __c) * __b;
|
|
} else if ((crt_isinf(__a) || crt_isinf(__b)) && crt_isfinite(__c) &&
|
|
crt_isfinite(__d)) {
|
|
__a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a);
|
|
__b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b);
|
|
COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c + __b * __d);
|
|
COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__b * __c - __a * __d);
|
|
} else if (crt_isinf(__logbw) && __logbw > 0 && crt_isfinite(__a) &&
|
|
crt_isfinite(__b)) {
|
|
__c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c);
|
|
__d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d);
|
|
COMPLEX_REAL(z) = 0 * (__a * __c + __b * __d);
|
|
COMPLEX_IMAGINARY(z) = 0 * (__b * __c - __a * __d);
|
|
}
|
|
}
|
|
return z;
|
|
}
|
|
|
|
#endif
|