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📄 README.txt(14.85 KB)
📁 aarch64
📄 absvdi2.c(815 B)
📄 absvsi2.c(815 B)
📄 absvti2.c(864 B)
📄 adddf3.c(859 B)
📄 addsf3.c(853 B)
📄 addtf3.c(730 B)
📄 addvdi3.c(819 B)
📄 addvsi3.c(819 B)
📄 addvti3.c(868 B)
📄 apple_versioning.c(13.1 KB)
📁 arm
📄 ashldi3.c(1.17 KB)
📄 ashlti3.c(1.15 KB)
📄 ashrdi3.c(1.27 KB)
📄 ashrti3.c(1.25 KB)
📄 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)
📄 bswapsi2.c(743 B)
📄 clear_cache.c(6.13 KB)
📄 clzdi2.c(1.27 KB)
📄 clzsi2.c(1.48 KB)
📄 clzti2.c(884 B)
📄 cmpdi2.c(1.12 KB)
📄 cmpti2.c(974 B)
📄 comparedf2.c(4.29 KB)
📄 comparesf2.c(4.28 KB)
📄 comparetf2.c(3.79 KB)
📄 cpu_model.c(21.28 KB)
📄 ctzdi2.c(1.27 KB)
📄 ctzsi2.c(1.61 KB)
📄 ctzti2.c(884 B)
📄 divdc3.c(2.18 KB)
📄 divdf3.c(7.55 KB)
📄 divdi3.c(1.13 KB)
📄 divmoddi4.c(712 B)
📄 divmodsi4.c(715 B)
📄 divsc3.c(2.14 KB)
📄 divsf3.c(6.96 KB)
📄 divsi3.c(1.32 KB)
📄 divtc3.c(2.23 KB)
📄 divtf3.c(8.01 KB)
📄 divti3.c(1.18 KB)
📄 divxc3.c(2.17 KB)
📄 emutls.c(12.39 KB)
📄 enable_execute_stack.c(2.08 KB)
📄 eprintf.c(953 B)
📄 extenddftf2.c(623 B)
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📄 ffsdi2.c(900 B)
📄 ffssi2.c(776 B)
📄 ffsti2.c(969 B)
📄 fixdfdi.c(1.22 KB)
📄 fixdfsi.c(755 B)
📄 fixdfti.c(633 B)
📄 fixsfdi.c(1.22 KB)
📄 fixsfsi.c(755 B)
📄 fixsfti.c(633 B)
📄 fixtfdi.c(624 B)
📄 fixtfsi.c(624 B)
📄 fixtfti.c(624 B)
📄 fixunsdfdi.c(1.29 KB)
📄 fixunsdfsi.c(743 B)
📄 fixunsdfti.c(611 B)
📄 fixunssfdi.c(1.3 KB)
📄 fixunssfsi.c(896 B)
📄 fixunssfti.c(731 B)
📄 fixunstfdi.c(604 B)
📄 fixunstfsi.c(604 B)
📄 fixunstfti.c(604 B)
📄 fixunsxfdi.c(1.65 KB)
📄 fixunsxfsi.c(1.62 KB)
📄 fixunsxfti.c(1.41 KB)
📄 fixxfdi.c(1.75 KB)
📄 fixxfti.c(1.48 KB)
📄 floatdidf.c(3.37 KB)
📄 floatdisf.c(2.49 KB)
📄 floatditf.c(1.5 KB)
📄 floatdixf.c(1.37 KB)
📄 floatsidf.c(1.7 KB)
📄 floatsisf.c(1.89 KB)
📄 floatsitf.c(1.5 KB)
📄 floattidf.c(2.49 KB)
📄 floattisf.c(2.33 KB)
📄 floattitf.c(2.72 KB)
📄 floattixf.c(2.53 KB)
📄 floatundidf.c(3.43 KB)
📄 floatundisf.c(2.4 KB)
📄 floatunditf.c(1.27 KB)
📄 floatundixf.c(1.24 KB)
📄 floatunsidf.c(1.43 KB)
📄 floatunsisf.c(1.75 KB)
📄 floatunsitf.c(1.29 KB)
📄 floatuntidf.c(2.38 KB)
📄 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)
📁 hexagon
📁 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)
📄 lshrti3.c(1.17 KB)
📄 mingw_fixfloat.c(1.29 KB)
📄 moddi3.c(1004 B)
📄 modsi3.c(649 B)
📄 modti3.c(1.03 KB)
📄 muldc3.c(2.14 KB)
📄 muldf3.c(918 B)
📄 muldi3.c(1.55 KB)
📄 mulodi4.c(1.31 KB)
📄 mulosi4.c(1.31 KB)
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📄 multi3.c(1.53 KB)
📄 mulvdi3.c(1.26 KB)
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📄 mulvti3.c(1.31 KB)
📄 mulxc3.c(2.22 KB)
📄 negdf2.c(832 B)
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📄 negvti2.c(817 B)
📄 os_version_check.c(8.07 KB)
📄 paritydi2.c(712 B)
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📄 parityti2.c(761 B)
📄 popcountdi2.c(1.33 KB)
📄 popcountsi2.c(1.13 KB)
📄 popcountti2.c(1.69 KB)
📄 powidf2.c(786 B)
📄 powisf2.c(783 B)
📄 powitf2.c(888 B)
📄 powixf2.c(825 B)
📁 ppc
📁 riscv
📁 sparc64
📄 subdf3.c(917 B)
📄 subsf3.c(917 B)
📄 subtf3.c(825 B)
📄 subvdi3.c(819 B)
📄 subvsi3.c(819 B)
📄 subvti3.c(868 B)
📄 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)
📄 udivti3.c(699 B)
📄 umoddi3.c(724 B)
📄 umodsi3.c(724 B)
📄 umodti3.c(717 B)
📄 unwind-ehabi-helpers.h(1.86 KB)
📁 ve
📁 x86_64

Editing: udivmoddi4.c

//===-- udivmoddi4.c - Implement __udivmoddi4 -----------------------------===//
//
// 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 __udivmoddi4 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//

#include "int_lib.h"

// Effects: if rem != 0, *rem = a % b
// Returns: a / b

// Translated from Figure 3-40 of The PowerPC Compiler Writer's Guide

#if defined(_MSC_VER) && !defined(__clang__)
// MSVC throws a warning about mod 0 here, disable it for builds that
// warn-as-error
#pragma warning(push)
#pragma warning(disable : 4724)
#endif

COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int *rem) {
  const unsigned n_uword_bits = sizeof(su_int) * CHAR_BIT;
  const unsigned n_udword_bits = sizeof(du_int) * CHAR_BIT;
  udwords n;
  n.all = a;
  udwords d;
  d.all = b;
  udwords q;
  udwords r;
  unsigned sr;
  // special cases, X is unknown, K != 0
  if (n.s.high == 0) {
    if (d.s.high == 0) {
      // 0 X
      // ---
      // 0 X
      if (rem)
        *rem = n.s.low % d.s.low;
      return n.s.low / d.s.low;
    }
    // 0 X
    // ---
    // K X
    if (rem)
      *rem = n.s.low;
    return 0;
  }
  // n.s.high != 0
  if (d.s.low == 0) {
    if (d.s.high == 0) {
      // K X
      // ---
      // 0 0
      if (rem)
        *rem = n.s.high % d.s.low;
      return n.s.high / d.s.low;
    }
    // d.s.high != 0
    if (n.s.low == 0) {
      // K 0
      // ---
      // K 0
      if (rem) {
        r.s.high = n.s.high % d.s.high;
        r.s.low = 0;
        *rem = r.all;
      }
      return n.s.high / d.s.high;
    }
    // K K
    // ---
    // K 0
    if ((d.s.high & (d.s.high - 1)) == 0) /* if d is a power of 2 */ {
      if (rem) {
        r.s.low = n.s.low;
        r.s.high = n.s.high & (d.s.high - 1);
        *rem = r.all;
      }
      return n.s.high >> __builtin_ctz(d.s.high);
    }
    // K K
    // ---
    // K 0
    sr = clzsi(d.s.high) - clzsi(n.s.high);
    // 0 <= sr <= n_uword_bits - 2 or sr large
    if (sr > n_uword_bits - 2) {
      if (rem)
        *rem = n.all;
      return 0;
    }
    ++sr;
    // 1 <= sr <= n_uword_bits - 1
    // q.all = n.all << (n_udword_bits - sr);
    q.s.low = 0;
    q.s.high = n.s.low << (n_uword_bits - sr);
    // r.all = n.all >> sr;
    r.s.high = n.s.high >> sr;
    r.s.low = (n.s.high << (n_uword_bits - sr)) | (n.s.low >> sr);
  } else /* d.s.low != 0 */ {
    if (d.s.high == 0) {
      // K X
      // ---
      // 0 K
      if ((d.s.low & (d.s.low - 1)) == 0) /* if d is a power of 2 */ {
        if (rem)
          *rem = n.s.low & (d.s.low - 1);
        if (d.s.low == 1)
          return n.all;
        sr = __builtin_ctz(d.s.low);
        q.s.high = n.s.high >> sr;
        q.s.low = (n.s.high << (n_uword_bits - sr)) | (n.s.low >> sr);
        return q.all;
      }
      // K X
      // ---
      // 0 K
      sr = 1 + n_uword_bits + clzsi(d.s.low) - clzsi(n.s.high);
      // 2 <= sr <= n_udword_bits - 1
      // q.all = n.all << (n_udword_bits - sr);
      // r.all = n.all >> sr;
      if (sr == n_uword_bits) {
        q.s.low = 0;
        q.s.high = n.s.low;
        r.s.high = 0;
        r.s.low = n.s.high;
      } else if (sr < n_uword_bits) /* 2 <= sr <= n_uword_bits - 1 */ {
        q.s.low = 0;
        q.s.high = n.s.low << (n_uword_bits - sr);
        r.s.high = n.s.high >> sr;
        r.s.low = (n.s.high << (n_uword_bits - sr)) | (n.s.low >> sr);
      } else /* n_uword_bits + 1 <= sr <= n_udword_bits - 1 */ {
        q.s.low = n.s.low << (n_udword_bits - sr);
        q.s.high = (n.s.high << (n_udword_bits - sr)) |
                   (n.s.low >> (sr - n_uword_bits));
        r.s.high = 0;
        r.s.low = n.s.high >> (sr - n_uword_bits);
      }
    } else {
      // K X
      // ---
      // K K
      sr = clzsi(d.s.high) - clzsi(n.s.high);
      // 0 <= sr <= n_uword_bits - 1 or sr large
      if (sr > n_uword_bits - 1) {
        if (rem)
          *rem = n.all;
        return 0;
      }
      ++sr;
      // 1 <= sr <= n_uword_bits
      // q.all = n.all << (n_udword_bits - sr);
      q.s.low = 0;
      if (sr == n_uword_bits) {
        q.s.high = n.s.low;
        r.s.high = 0;
        r.s.low = n.s.high;
      } else {
        q.s.high = n.s.low << (n_uword_bits - sr);
        r.s.high = n.s.high >> sr;
        r.s.low = (n.s.high << (n_uword_bits - sr)) | (n.s.low >> sr);
      }
    }
  }
  // Not a special case
  // q and r are initialized with:
  // q.all = n.all << (n_udword_bits - sr);
  // r.all = n.all >> sr;
  // 1 <= sr <= n_udword_bits - 1
  su_int carry = 0;
  for (; sr > 0; --sr) {
    // r:q = ((r:q)  << 1) | carry
    r.s.high = (r.s.high << 1) | (r.s.low >> (n_uword_bits - 1));
    r.s.low = (r.s.low << 1) | (q.s.high >> (n_uword_bits - 1));
    q.s.high = (q.s.high << 1) | (q.s.low >> (n_uword_bits - 1));
    q.s.low = (q.s.low << 1) | carry;
    // carry = 0;
    // if (r.all >= d.all)
    // {
    //      r.all -= d.all;
    //      carry = 1;
    // }
    const di_int s = (di_int)(d.all - r.all - 1) >> (n_udword_bits - 1);
    carry = s & 1;
    r.all -= d.all & s;
  }
  q.all = (q.all << 1) | carry;
  if (rem)
    *rem = r.all;
  return q.all;
}

#if defined(_MSC_VER) && !defined(__clang__)
#pragma warning(pop)
#endif

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