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Current Path: /usr/src/contrib/llvm-project/compiler-rt/lib/builtins/ppc

usr / src / contrib / llvm-project / compiler-rt / lib / builtins / ppc /

📁 ..
📄 DD.h(1.12 KB)
📄 divtc3.c(3.23 KB)
📄 fixtfdi.c(3.29 KB)
📄 fixtfti.c(1.32 KB)
📄 fixunstfdi.c(1.94 KB)
📄 fixunstfti.c(4.58 KB)
📄 floatditf.c(1.02 KB)
📄 floattitf.c(1.97 KB)
📄 floatunditf.c(1.25 KB)
📄 gcc_qadd.c(1.88 KB)
📄 gcc_qdiv.c(1.25 KB)
📄 gcc_qmul.c(1.25 KB)
📄 gcc_qsub.c(1.88 KB)
📄 multc3.c(2.55 KB)
📄 restFP.S(1.44 KB)
📄 saveFP.S(1.33 KB)

Editing: gcc_qmul.c

// 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

// long double __gcc_qmul(long double x, long double y);
// This file implements the PowerPC 128-bit double-double multiply operation.
// This implementation is shamelessly cribbed from Apple's DDRT, circa 1993(!)

#include "DD.h"

long double __gcc_qmul(long double x, long double y) {
  static const uint32_t infinityHi = UINT32_C(0x7ff00000);
  DD dst = {.ld = x}, src = {.ld = y};

double aHi, aLo, bHi, bLo;
  double ab, tmp, tau;

ab = A * B;

// Detect special cases
  if (ab == 0.0) {
    dst.s.hi = ab;
    dst.s.lo = 0.0;
    return dst.ld;
  }

const doublebits abBits = {.d = ab};
  if (((uint32_t)(abBits.x >> 32) & infinityHi) == infinityHi) {
    dst.s.hi = ab;
    dst.s.lo = 0.0;
    return dst.ld;
  }

// Generic cases handled here.
  aHi = high26bits(A);
  bHi = high26bits(B);
  aLo = A - aHi;
  bLo = B - bHi;

tmp = LOWORDER(ab, aHi, aLo, bHi, bLo);
  tmp += (A * b + a * B);
  tau = ab + tmp;

dst.s.lo = (ab - tau) + tmp;
  dst.s.hi = tau;

return dst.ld;
}

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Editing: gcc_qmul.c

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