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📄 README.txt(14.85 KB)
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📄 absvdi2.c(815 B)
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📄 adddf3.c(859 B)
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📄 assembly.h(7.11 KB)
📄 atomic.c(16.86 KB)
📄 atomic_flag_clear.c(791 B)
📄 atomic_flag_clear_explicit.c(859 B)
📄 atomic_flag_test_and_set.c(823 B)
📄 atomic_flag_test_and_set_explicit.c(898 B)
📄 atomic_signal_fence.c(761 B)
📄 atomic_thread_fence.c(761 B)
📄 bswapdi2.c(958 B)
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📄 comparedf2.c(4.29 KB)
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📄 comparetf2.c(3.79 KB)
📄 cpu_model.c(21.28 KB)
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📄 eprintf.c(953 B)
📄 extenddftf2.c(623 B)
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📄 extendsfdf2.c(716 B)
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📄 floatdidf.c(3.37 KB)
📄 floatdisf.c(2.49 KB)
📄 floatditf.c(1.5 KB)
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📄 floatsidf.c(1.7 KB)
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📄 floatunsisf.c(1.75 KB)
📄 floatunsitf.c(1.29 KB)
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📄 floatuntisf.c(2.24 KB)
📄 floatuntitf.c(2.6 KB)
📄 floatuntixf.c(2.39 KB)
📄 fp_add_impl.inc(5.4 KB)
📄 fp_extend.h(2.36 KB)
📄 fp_extend_impl.inc(4.53 KB)
📄 fp_fixint_impl.inc(1.52 KB)
📄 fp_fixuint_impl.inc(1.42 KB)
📄 fp_lib.h(10.12 KB)
📄 fp_mode.c(812 B)
📄 fp_mode.h(824 B)
📄 fp_mul_impl.inc(4.37 KB)
📄 fp_trunc.h(2.01 KB)
📄 fp_trunc_impl.inc(5.57 KB)
📄 gcc_personality_v0.c(8.3 KB)
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📁 i386
📄 int_div_impl.inc(2.19 KB)
📄 int_endianness.h(2.75 KB)
📄 int_lib.h(4.57 KB)
📄 int_math.h(3.6 KB)
📄 int_types.h(4.16 KB)
📄 int_util.c(1.95 KB)
📄 int_util.h(1.32 KB)
📄 lshrdi3.c(1.18 KB)
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📄 mingw_fixfloat.c(1.29 KB)
📄 moddi3.c(1004 B)
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📄 modti3.c(1.03 KB)
📄 muldc3.c(2.14 KB)
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📄 negvti2.c(817 B)
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📄 popcountdi2.c(1.33 KB)
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📄 popcountti2.c(1.69 KB)
📄 powidf2.c(786 B)
📄 powisf2.c(783 B)
📄 powitf2.c(888 B)
📄 powixf2.c(825 B)
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📁 sparc64
📄 subdf3.c(917 B)
📄 subsf3.c(917 B)
📄 subtf3.c(825 B)
📄 subvdi3.c(819 B)
📄 subvsi3.c(819 B)
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📄 trampoline_setup.c(1.75 KB)
📄 truncdfhf2.c(715 B)
📄 truncdfsf2.c(711 B)
📄 truncsfhf2.c(940 B)
📄 trunctfdf2.c(625 B)
📄 trunctfsf2.c(624 B)
📄 ucmpdi2.c(1.13 KB)
📄 ucmpti2.c(978 B)
📄 udivdi3.c(724 B)
📄 udivmoddi4.c(5.4 KB)
📄 udivmodsi4.c(715 B)
📄 udivmodti4.c(4.87 KB)
📄 udivsi3.c(802 B)
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📄 umoddi3.c(724 B)
📄 umodsi3.c(724 B)
📄 umodti3.c(717 B)
📄 unwind-ehabi-helpers.h(1.86 KB)
📁 ve
📁 x86_64

Editing: fp_trunc_impl.inc

//= lib/fp_trunc_impl.inc - high precision -> low precision conversion *-*-===//
//
// 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 a fairly generic conversion from a wider to a narrower
// IEEE-754 floating-point type in the default (round to nearest, ties to even)
// rounding mode.  The constants and types defined following the includes below
// parameterize the conversion.
//
// This routine can be trivially adapted to support conversions to
// half-precision or from quad-precision. It does not support types that don't
// use the usual IEEE-754 interchange formats; specifically, some work would be
// needed to adapt it to (for example) the Intel 80-bit format or PowerPC
// double-double format.
//
// Note please, however, that this implementation is only intended to support
// *narrowing* operations; if you need to convert to a *wider* floating-point
// type (e.g. float -> double), then this routine will not do what you want it
// to.
//
// It also requires that integer types at least as large as both formats
// are available on the target platform; this may pose a problem when trying
// to add support for quad on some 32-bit systems, for example.
//
// Finally, the following assumptions are made:
//
// 1. Floating-point types and integer types have the same endianness on the
//    target platform.
//
// 2. Quiet NaNs, if supported, are indicated by the leading bit of the
//    significand field being set.
//
//===----------------------------------------------------------------------===//

#include "fp_trunc.h"

static __inline dst_t __truncXfYf2__(src_t a) {
  // Various constants whose values follow from the type parameters.
  // Any reasonable optimizer will fold and propagate all of these.
  const int srcBits = sizeof(src_t) * CHAR_BIT;
  const int srcExpBits = srcBits - srcSigBits - 1;
  const int srcInfExp = (1 << srcExpBits) - 1;
  const int srcExpBias = srcInfExp >> 1;

const src_rep_t srcMinNormal = SRC_REP_C(1) << srcSigBits;
  const src_rep_t srcSignificandMask = srcMinNormal - 1;
  const src_rep_t srcInfinity = (src_rep_t)srcInfExp << srcSigBits;
  const src_rep_t srcSignMask = SRC_REP_C(1) << (srcSigBits + srcExpBits);
  const src_rep_t srcAbsMask = srcSignMask - 1;
  const src_rep_t roundMask = (SRC_REP_C(1) << (srcSigBits - dstSigBits)) - 1;
  const src_rep_t halfway = SRC_REP_C(1) << (srcSigBits - dstSigBits - 1);
  const src_rep_t srcQNaN = SRC_REP_C(1) << (srcSigBits - 1);
  const src_rep_t srcNaNCode = srcQNaN - 1;

const int dstBits = sizeof(dst_t) * CHAR_BIT;
  const int dstExpBits = dstBits - dstSigBits - 1;
  const int dstInfExp = (1 << dstExpBits) - 1;
  const int dstExpBias = dstInfExp >> 1;

const int underflowExponent = srcExpBias + 1 - dstExpBias;
  const int overflowExponent = srcExpBias + dstInfExp - dstExpBias;
  const src_rep_t underflow = (src_rep_t)underflowExponent << srcSigBits;
  const src_rep_t overflow = (src_rep_t)overflowExponent << srcSigBits;

const dst_rep_t dstQNaN = DST_REP_C(1) << (dstSigBits - 1);
  const dst_rep_t dstNaNCode = dstQNaN - 1;

// Break a into a sign and representation of the absolute value.
  const src_rep_t aRep = srcToRep(a);
  const src_rep_t aAbs = aRep & srcAbsMask;
  const src_rep_t sign = aRep & srcSignMask;
  dst_rep_t absResult;

if (aAbs - underflow < aAbs - overflow) {
    // The exponent of a is within the range of normal numbers in the
    // destination format.  We can convert by simply right-shifting with
    // rounding and adjusting the exponent.
    absResult = aAbs >> (srcSigBits - dstSigBits);
    absResult -= (dst_rep_t)(srcExpBias - dstExpBias) << dstSigBits;

const src_rep_t roundBits = aAbs & roundMask;
    // Round to nearest.
    if (roundBits > halfway)
      absResult++;
    // Tie to even.
    else if (roundBits == halfway)
      absResult += absResult & 1;
  } else if (aAbs > srcInfinity) {
    // a is NaN.
    // Conjure the result by beginning with infinity, setting the qNaN
    // bit and inserting the (truncated) trailing NaN field.
    absResult = (dst_rep_t)dstInfExp << dstSigBits;
    absResult |= dstQNaN;
    absResult |=
        ((aAbs & srcNaNCode) >> (srcSigBits - dstSigBits)) & dstNaNCode;
  } else if (aAbs >= overflow) {
    // a overflows to infinity.
    absResult = (dst_rep_t)dstInfExp << dstSigBits;
  } else {
    // a underflows on conversion to the destination type or is an exact
    // zero.  The result may be a denormal or zero.  Extract the exponent
    // to get the shift amount for the denormalization.
    const int aExp = aAbs >> srcSigBits;
    const int shift = srcExpBias - dstExpBias - aExp + 1;

const src_rep_t significand = (aRep & srcSignificandMask) | srcMinNormal;

// Right shift by the denormalization amount with sticky.
    if (shift > srcSigBits) {
      absResult = 0;
    } else {
      const bool sticky = (significand << (srcBits - shift)) != 0;
      src_rep_t denormalizedSignificand = significand >> shift | sticky;
      absResult = denormalizedSignificand >> (srcSigBits - dstSigBits);
      const src_rep_t roundBits = denormalizedSignificand & roundMask;
      // Round to nearest
      if (roundBits > halfway)
        absResult++;
      // Ties to even
      else if (roundBits == halfway)
        absResult += absResult & 1;
    }
  }

// Apply the signbit to the absolute value.
  const dst_rep_t result = absResult | sign >> (srcBits - dstBits);
  return dstFromRep(result);
}

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