llvm-project

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//===-- multc3.c - Implement __multc3 -------------------------------------===//
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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 __multc3 for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#define QUAD_PRECISION
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#include "fp_lib.h"
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#include "int_lib.h"
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#include "int_math.h"
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#if defined(CRT_HAS_F128)
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// Returns: the product of a + ib and c + id
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COMPILER_RT_ABI Qcomplex __multc3(fp_t a, fp_t b, fp_t c, fp_t d) {
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  fp_t ac = a * c;
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  fp_t bd = b * d;
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  fp_t ad = a * d;
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  fp_t bc = b * c;
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  Qcomplex z;
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  COMPLEXTF_REAL(z) = ac - bd;
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  COMPLEXTF_IMAGINARY(z) = ad + bc;
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  if (crt_isnan(COMPLEXTF_REAL(z)) && crt_isnan(COMPLEXTF_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_copysigntf(crt_isinf(a) ? 1 : 0, a);
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      b = crt_copysigntf(crt_isinf(b) ? 1 : 0, b);
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      if (crt_isnan(c))
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        c = crt_copysigntf(0, c);
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      if (crt_isnan(d))
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        d = crt_copysigntf(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_copysigntf(crt_isinf(c) ? 1 : 0, c);
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      d = crt_copysigntf(crt_isinf(d) ? 1 : 0, d);
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      if (crt_isnan(a))
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        a = crt_copysigntf(0, a);
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      if (crt_isnan(b))
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        b = crt_copysigntf(0, b);
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      recalc = 1;
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    }
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    if (!recalc &&
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        (crt_isinf(ac) || crt_isinf(bd) || crt_isinf(ad) || crt_isinf(bc))) {
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      if (crt_isnan(a))
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        a = crt_copysigntf(0, a);
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      if (crt_isnan(b))
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        b = crt_copysigntf(0, b);
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      if (crt_isnan(c))
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        c = crt_copysigntf(0, c);
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      if (crt_isnan(d))
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        d = crt_copysigntf(0, d);
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      recalc = 1;
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    }
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    if (recalc) {
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      COMPLEXTF_REAL(z) = CRT_INFINITY * (a * c - b * d);
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      COMPLEXTF_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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