llvm-project

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//===-- mulxc3.c - Implement __mulxc3 -------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements __mulxc3 for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#if !_ARCH_PPC
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#include "int_lib.h"
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#include "int_math.h"
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// Returns: the product of a + ib and c + id
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COMPILER_RT_ABI Lcomplex __mulxc3(xf_float __a, xf_float __b, xf_float __c,
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                                  xf_float __d) {
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  xf_float __ac = __a * __c;
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  xf_float __bd = __b * __d;
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  xf_float __ad = __a * __d;
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  xf_float __bc = __b * __c;
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  Lcomplex z;
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  COMPLEX_REAL(z) = __ac - __bd;
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  COMPLEX_IMAGINARY(z) = __ad + __bc;
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  if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
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    int __recalc = 0;
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    if (crt_isinf(__a) || crt_isinf(__b)) {
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      __a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a);
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      __b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b);
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      if (crt_isnan(__c))
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        __c = crt_copysignl(0, __c);
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      if (crt_isnan(__d))
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        __d = crt_copysignl(0, __d);
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      __recalc = 1;
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    }
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    if (crt_isinf(__c) || crt_isinf(__d)) {
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      __c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c);
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      __d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d);
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      if (crt_isnan(__a))
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        __a = crt_copysignl(0, __a);
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      if (crt_isnan(__b))
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        __b = crt_copysignl(0, __b);
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      __recalc = 1;
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    }
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    if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) ||
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                      crt_isinf(__bc))) {
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      if (crt_isnan(__a))
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        __a = crt_copysignl(0, __a);
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      if (crt_isnan(__b))
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        __b = crt_copysignl(0, __b);
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      if (crt_isnan(__c))
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        __c = crt_copysignl(0, __c);
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      if (crt_isnan(__d))
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        __d = crt_copysignl(0, __d);
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      __recalc = 1;
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    }
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    if (__recalc) {
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      COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);
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      COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);
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    }
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  }
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  return z;
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}
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#endif
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