compiler-rt/lib/builtins: Newqual-98

26 files changed, 1771 insertions, 1 deletions

diff --git a/LICENSE.LLVM b/LICENSE.LLVM
new file mode 100644
index 0000000000..fa6ac54000
--- /dev/null
+++ b/LICENSE.LLVM
@@ -0,0 +1,279 @@
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diff --git a/cpukit/compiler-rt/lib/builtins/bswapdi2.c b/cpukit/compiler-rt/lib/builtins/bswapdi2.c
new file mode 100644
index 0000000000..cd049f58e3
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/bswapdi2.c
@@ -0,0 +1,25 @@
+//===-- bswapdi2.c - Implement __bswapdi2 ---------------------------------===//
+//
+// 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 __bswapdi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+COMPILER_RT_ABI uint64_t __bswapdi2(uint64_t u) {
+  return (
+      (((u)&0xff00000000000000ULL) >> 56) |
+      (((u)&0x00ff000000000000ULL) >> 40) |
+      (((u)&0x0000ff0000000000ULL) >> 24) |
+      (((u)&0x000000ff00000000ULL) >> 8)  |
+      (((u)&0x00000000ff000000ULL) << 8)  |
+      (((u)&0x0000000000ff0000ULL) << 24) |
+      (((u)&0x000000000000ff00ULL) << 40) |
+      (((u)&0x00000000000000ffULL) << 56));
+}
diff --git a/cpukit/compiler-rt/lib/builtins/bswapsi2.c b/cpukit/compiler-rt/lib/builtins/bswapsi2.c
new file mode 100644
index 0000000000..ec566d61a2
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/bswapsi2.c
@@ -0,0 +1,20 @@
+//===-- bswapsi2.c - Implement __bswapsi2 ---------------------------------===//
+//
+// 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 __bswapsi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+COMPILER_RT_ABI uint32_t __bswapsi2(uint32_t u) {
+  return ((((u)&0xff000000) >> 24) |
+          (((u)&0x00ff0000) >> 8)  |
+          (((u)&0x0000ff00) << 8)  |
+          (((u)&0x000000ff) << 24));
+}
diff --git a/cpukit/compiler-rt/lib/builtins/clzdi2.c b/cpukit/compiler-rt/lib/builtins/clzdi2.c
new file mode 100644
index 0000000000..12c17982a5
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/clzdi2.c
@@ -0,0 +1,35 @@
+//===-- clzdi2.c - Implement __clzdi2 -------------------------------------===//
+//
+// 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 __clzdi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: the number of leading 0-bits
+
+#if !defined(__clang__) &&                                                     \
+    ((defined(__sparc__) && defined(__arch64__)) || defined(__mips64) ||       \
+     (defined(__riscv) && __SIZEOF_POINTER__ >= 8))
+// On 64-bit architectures with neither a native clz instruction nor a native
+// ctz instruction, gcc resolves __builtin_clz to __clzdi2 rather than
+// __clzsi2, leading to infinite recursion.
+#define __builtin_clz(a) __clzsi2(a)
+extern int __clzsi2(si_int);
+#endif
+
+// Precondition: a != 0
+
+COMPILER_RT_ABI int __clzdi2(di_int a) {
+  dwords x;
+  x.all = a;
+  const si_int f = -(x.s.high == 0);
+  return clzsi((x.s.high & ~f) | (x.s.low & f)) +
+         (f & ((si_int)(sizeof(si_int) * CHAR_BIT)));
+}
diff --git a/cpukit/compiler-rt/lib/builtins/clzsi2.c b/cpukit/compiler-rt/lib/builtins/clzsi2.c
new file mode 100644
index 0000000000..d75f56d937
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/clzsi2.c
@@ -0,0 +1,48 @@
+//===-- clzsi2.c - Implement __clzsi2 -------------------------------------===//
+//
+// 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 __clzsi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: the number of leading 0-bits
+
+// Precondition: a != 0
+
+COMPILER_RT_ABI int __clzsi2(si_int a) {
+  su_int x = (su_int)a;
+  si_int t = ((x & 0xFFFF0000) == 0) << 4; // if (x is small) t = 16 else 0
+  x >>= 16 - t;                            // x = [0 - 0xFFFF]
+  su_int r = t;                            // r = [0, 16]
+  // return r + clz(x)
+  t = ((x & 0xFF00) == 0) << 3;
+  x >>= 8 - t; // x = [0 - 0xFF]
+  r += t;      // r = [0, 8, 16, 24]
+  // return r + clz(x)
+  t = ((x & 0xF0) == 0) << 2;
+  x >>= 4 - t; // x = [0 - 0xF]
+  r += t;      // r = [0, 4, 8, 12, 16, 20, 24, 28]
+  // return r + clz(x)
+  t = ((x & 0xC) == 0) << 1;
+  x >>= 2 - t; // x = [0 - 3]
+  r += t;      // r = [0 - 30] and is even
+  // return r + clz(x)
+  //     switch (x)
+  //     {
+  //     case 0:
+  //         return r + 2;
+  //     case 1:
+  //         return r + 1;
+  //     case 2:
+  //     case 3:
+  //         return r;
+  //     }
+  return r + ((2 - x) & -((x & 2) == 0));
+}
diff --git a/cpukit/compiler-rt/lib/builtins/ctzdi2.c b/cpukit/compiler-rt/lib/builtins/ctzdi2.c
new file mode 100644
index 0000000000..26c908d876
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/ctzdi2.c
@@ -0,0 +1,35 @@
+//===-- ctzdi2.c - Implement __ctzdi2 -------------------------------------===//
+//
+// 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 __ctzdi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: the number of trailing 0-bits
+
+#if !defined(__clang__) &&                                                     \
+    ((defined(__sparc__) && defined(__arch64__)) || defined(__mips64) ||       \
+     (defined(__riscv) && __SIZEOF_POINTER__ >= 8))
+// On 64-bit architectures with neither a native clz instruction nor a native
+// ctz instruction, gcc resolves __builtin_ctz to __ctzdi2 rather than
+// __ctzsi2, leading to infinite recursion.
+#define __builtin_ctz(a) __ctzsi2(a)
+extern int __ctzsi2(si_int);
+#endif
+
+// Precondition: a != 0
+
+COMPILER_RT_ABI int __ctzdi2(di_int a) {
+  dwords x;
+  x.all = a;
+  const si_int f = -(x.s.low == 0);
+  return ctzsi((x.s.high & f) | (x.s.low & ~f)) +
+         (f & ((si_int)(sizeof(si_int) * CHAR_BIT)));
+}
diff --git a/cpukit/compiler-rt/lib/builtins/ctzsi2.c b/cpukit/compiler-rt/lib/builtins/ctzsi2.c
new file mode 100644
index 0000000000..ed95c60579
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/ctzsi2.c
@@ -0,0 +1,53 @@
+//===-- ctzsi2.c - Implement __ctzsi2 -------------------------------------===//
+//
+// 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 __ctzsi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: the number of trailing 0-bits
+
+// Precondition: a != 0
+
+COMPILER_RT_ABI int __ctzsi2(si_int a) {
+  su_int x = (su_int)a;
+  si_int t = ((x & 0x0000FFFF) == 0)
+             << 4; // if (x has no small bits) t = 16 else 0
+  x >>= t;         // x = [0 - 0xFFFF] + higher garbage bits
+  su_int r = t;    // r = [0, 16]
+  // return r + ctz(x)
+  t = ((x & 0x00FF) == 0) << 3;
+  x >>= t; // x = [0 - 0xFF] + higher garbage bits
+  r += t;  // r = [0, 8, 16, 24]
+  // return r + ctz(x)
+  t = ((x & 0x0F) == 0) << 2;
+  x >>= t; // x = [0 - 0xF] + higher garbage bits
+  r += t;  // r = [0, 4, 8, 12, 16, 20, 24, 28]
+  // return r + ctz(x)
+  t = ((x & 0x3) == 0) << 1;
+  x >>= t;
+  x &= 3; // x = [0 - 3]
+  r += t; // r = [0 - 30] and is even
+  // return r + ctz(x)
+
+  //  The branch-less return statement below is equivalent
+  //  to the following switch statement:
+  //     switch (x)
+  //    {
+  //     case 0:
+  //         return r + 2;
+  //     case 2:
+  //         return r + 1;
+  //     case 1:
+  //     case 3:
+  //         return r;
+  //     }
+  return r + ((2 - (x >> 1)) & -((x & 1) == 0));
+}
diff --git a/cpukit/compiler-rt/lib/builtins/divdi3.c b/cpukit/compiler-rt/lib/builtins/divdi3.c
new file mode 100644
index 0000000000..d71e138d99
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/divdi3.c
@@ -0,0 +1,22 @@
+//===-- divdi3.c - Implement __divdi3 -------------------------------------===//
+//
+// 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 __divdi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: a / b
+
+#define fixint_t di_int
+#define fixuint_t du_int
+#define COMPUTE_UDIV(a, b) __udivmoddi4((a), (b), (du_int *)0)
+#include "int_div_impl.inc"
+
+COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b) { return __divXi3(a, b); }
diff --git a/cpukit/compiler-rt/lib/builtins/ffsdi2.c b/cpukit/compiler-rt/lib/builtins/ffsdi2.c
new file mode 100644
index 0000000000..beae553043
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/ffsdi2.c
@@ -0,0 +1,27 @@
+//===-- ffsdi2.c - Implement __ffsdi2 -------------------------------------===//
+//
+// 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 __ffsdi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: the index of the least significant 1-bit in a, or
+// the value zero if a is zero. The least significant bit is index one.
+
+COMPILER_RT_ABI int __ffsdi2(di_int a) {
+  dwords x;
+  x.all = a;
+  if (x.s.low == 0) {
+    if (x.s.high == 0)
+      return 0;
+    return ctzsi(x.s.high) + (1 + sizeof(si_int) * CHAR_BIT);
+  }
+  return ctzsi(x.s.low) + 1;
+}
diff --git a/cpukit/compiler-rt/lib/builtins/ffssi2.c b/cpukit/compiler-rt/lib/builtins/ffssi2.c
new file mode 100644
index 0000000000..ddb52927f8
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/ffssi2.c
@@ -0,0 +1,23 @@
+//===-- ffssi2.c - Implement __ffssi2 -------------------------------------===//
+//
+// 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 __ffssi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: the index of the least significant 1-bit in a, or
+// the value zero if a is zero. The least significant bit is index one.
+
+COMPILER_RT_ABI int __ffssi2(si_int a) {
+  if (a == 0) {
+    return 0;
+  }
+  return ctzsi(a) + 1;
+}
diff --git a/cpukit/compiler-rt/lib/builtins/int_div_impl.inc b/cpukit/compiler-rt/lib/builtins/int_div_impl.inc
new file mode 100644
index 0000000000..dc1f97cbea
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/int_div_impl.inc
@@ -0,0 +1,95 @@
+//===-- int_div_impl.inc - Integer division ---------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Helpers used by __udivsi3, __umodsi3, __udivdi3, and __umodsi3.
+//
+//===----------------------------------------------------------------------===//
+
+#define clz(a) (sizeof(a) == sizeof(unsigned long long) ? __builtin_clzll(a) : clzsi(a))
+
+// Adapted from Figure 3-40 of The PowerPC Compiler Writer's Guide
+static __inline fixuint_t __udivXi3(fixuint_t n, fixuint_t d) {
+  const unsigned N = sizeof(fixuint_t) * CHAR_BIT;
+  // d == 0 cases are unspecified.
+  unsigned sr = (d ? clz(d) : N) - (n ? clz(n) : N);
+  // 0 <= sr <= N - 1 or sr is very large.
+  if (sr > N - 1) // n < d
+    return 0;
+  if (sr == N - 1) // d == 1
+    return n;
+  ++sr;
+  // 1 <= sr <= N - 1. Shifts do not trigger UB.
+  fixuint_t r = n >> sr;
+  n <<= N - sr;
+  fixuint_t carry = 0;
+  for (; sr > 0; --sr) {
+    r = (r << 1) | (n >> (N - 1));
+    n = (n << 1) | carry;
+    // Branch-less version of:
+    // carry = 0;
+    // if (r >= d) r -= d, carry = 1;
+    const fixint_t s = (fixint_t)(d - r - 1) >> (N - 1);
+    carry = s & 1;
+    r -= d & s;
+  }
+  n = (n << 1) | carry;
+  return n;
+}
+
+// Mostly identical to __udivXi3 but the return values are different.
+static __inline fixuint_t __umodXi3(fixuint_t n, fixuint_t d) {
+  const unsigned N = sizeof(fixuint_t) * CHAR_BIT;
+  // d == 0 cases are unspecified.
+  unsigned sr = (d ? clz(d) : N) - (n ? clz(n) : N);
+  // 0 <= sr <= N - 1 or sr is very large.
+  if (sr > N - 1) // n < d
+    return n;
+  if (sr == N - 1) // d == 1
+    return 0;
+  ++sr;
+  // 1 <= sr <= N - 1. Shifts do not trigger UB.
+  fixuint_t r = n >> sr;
+  n <<= N - sr;
+  fixuint_t carry = 0;
+  for (; sr > 0; --sr) {
+    r = (r << 1) | (n >> (N - 1));
+    n = (n << 1) | carry;
+    // Branch-less version of:
+    // carry = 0;
+    // if (r >= d) r -= d, carry = 1;
+    const fixint_t s = (fixint_t)(d - r - 1) >> (N - 1);
+    carry = s & 1;
+    r -= d & s;
+  }
+  return r;
+}
+
+#ifdef COMPUTE_UDIV
+static __inline fixint_t __divXi3(fixint_t a, fixint_t b) {
+  const int N = (int)(sizeof(fixint_t) * CHAR_BIT) - 1;
+  fixint_t s_a = a >> N;                            // s_a = a < 0 ? -1 : 0
+  fixint_t s_b = b >> N;                            // s_b = b < 0 ? -1 : 0
+  fixuint_t a_u = (fixuint_t)(a ^ s_a) + (-s_a);    // negate if s_a == -1
+  fixuint_t b_u = (fixuint_t)(b ^ s_b) + (-s_b);    // negate if s_b == -1
+  s_a ^= s_b;                                       // sign of quotient
+  return (COMPUTE_UDIV(a_u, b_u) ^ s_a) + (-s_a);   // negate if s_a == -1
+}
+#endif // COMPUTE_UDIV
+
+#ifdef ASSIGN_UMOD
+static __inline fixint_t __modXi3(fixint_t a, fixint_t b) {
+  const int N = (int)(sizeof(fixint_t) * CHAR_BIT) - 1;
+  fixint_t s = b >> N;                              // s = b < 0 ? -1 : 0
+  fixuint_t b_u = (fixuint_t)(b ^ s) + (-s);        // negate if s == -1
+  s = a >> N;                                       // s = a < 0 ? -1 : 0
+  fixuint_t a_u = (fixuint_t)(a ^ s) + (-s);        // negate if s == -1
+  fixuint_t res;
+  ASSIGN_UMOD(res, a_u, b_u);
+  return (res ^ s) + (-s);                          // negate if s == -1
+}
+#endif // ASSIGN_UMOD
diff --git a/cpukit/compiler-rt/lib/builtins/int_endianness.h b/cpukit/compiler-rt/lib/builtins/int_endianness.h
new file mode 100644
index 0000000000..291c6b58c8
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/int_endianness.h
@@ -0,0 +1,114 @@
+//===-- int_endianness.h - configuration header for compiler-rt -----------===//
+//
+// 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 is a configuration header for compiler-rt.
+// This file is not part of the interface of this library.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef INT_ENDIANNESS_H
+#define INT_ENDIANNESS_H
+
+#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) &&                \
+    defined(__ORDER_LITTLE_ENDIAN__)
+
+// Clang and GCC provide built-in endianness definitions.
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#define _YUGA_LITTLE_ENDIAN 0
+#define _YUGA_BIG_ENDIAN 1
+#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define _YUGA_LITTLE_ENDIAN 1
+#define _YUGA_BIG_ENDIAN 0
+#endif // __BYTE_ORDER__
+
+#else // Compilers other than Clang or GCC.
+
+#if defined(__SVR4) && defined(__sun)
+#include <sys/byteorder.h>
+
+#if defined(_BIG_ENDIAN)
+#define _YUGA_LITTLE_ENDIAN 0
+#define _YUGA_BIG_ENDIAN 1
+#elif defined(_LITTLE_ENDIAN)
+#define _YUGA_LITTLE_ENDIAN 1
+#define _YUGA_BIG_ENDIAN 0
+#else // !_LITTLE_ENDIAN
+#error "unknown endianness"
+#endif // !_LITTLE_ENDIAN
+
+#endif // Solaris
+
+// ..
+
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) ||   \
+    defined(__minix)
+#include <sys/endian.h>
+
+#if _BYTE_ORDER == _BIG_ENDIAN
+#define _YUGA_LITTLE_ENDIAN 0
+#define _YUGA_BIG_ENDIAN 1
+#elif _BYTE_ORDER == _LITTLE_ENDIAN
+#define _YUGA_LITTLE_ENDIAN 1
+#define _YUGA_BIG_ENDIAN 0
+#endif // _BYTE_ORDER
+
+#endif // *BSD
+
+#if defined(__OpenBSD__)
+#include <machine/endian.h>
+
+#if _BYTE_ORDER == _BIG_ENDIAN
+#define _YUGA_LITTLE_ENDIAN 0
+#define _YUGA_BIG_ENDIAN 1
+#elif _BYTE_ORDER == _LITTLE_ENDIAN
+#define _YUGA_LITTLE_ENDIAN 1
+#define _YUGA_BIG_ENDIAN 0
+#endif // _BYTE_ORDER
+
+#endif // OpenBSD
+
+// ..
+
+// Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the
+// compiler (at least with GCC)
+#if defined(__APPLE__) || defined(__ellcc__)
+
+#ifdef __BIG_ENDIAN__
+#if __BIG_ENDIAN__
+#define _YUGA_LITTLE_ENDIAN 0
+#define _YUGA_BIG_ENDIAN 1
+#endif
+#endif // __BIG_ENDIAN__
+
+#ifdef __LITTLE_ENDIAN__
+#if __LITTLE_ENDIAN__
+#define _YUGA_LITTLE_ENDIAN 1
+#define _YUGA_BIG_ENDIAN 0
+#endif
+#endif // __LITTLE_ENDIAN__
+
+#endif // Mac OSX
+
+// ..
+
+#if defined(_WIN32)
+
+#define _YUGA_LITTLE_ENDIAN 1
+#define _YUGA_BIG_ENDIAN 0
+
+#endif // Windows
+
+#endif // Clang or GCC.
+
+// .
+
+#if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)
+#error Unable to determine endian
+#endif // Check we found an endianness correctly.
+
+#endif // INT_ENDIANNESS_H
diff --git a/cpukit/compiler-rt/lib/builtins/int_lib.h b/cpukit/compiler-rt/lib/builtins/int_lib.h
new file mode 100644
index 0000000000..04ea2d9105
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/int_lib.h
@@ -0,0 +1,171 @@
+//===-- int_lib.h - configuration header for compiler-rt  -----------------===//
+//
+// 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 is a configuration header for compiler-rt.
+// This file is not part of the interface of this library.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef INT_LIB_H
+#define INT_LIB_H
+
+// Assumption: Signed integral is 2's complement.
+// Assumption: Right shift of signed negative is arithmetic shift.
+// Assumption: Endianness is little or big (not mixed).
+
+// ABI macro definitions
+
+#if __ARM_EABI__
+#ifdef COMPILER_RT_ARMHF_TARGET
+#define COMPILER_RT_ABI
+#else
+#define COMPILER_RT_ABI __attribute__((__pcs__("aapcs")))
+#endif
+#else
+#define COMPILER_RT_ABI
+#endif
+
+#define AEABI_RTABI __attribute__((__pcs__("aapcs")))
+
+#if defined(_MSC_VER) && !defined(__clang__)
+#define ALWAYS_INLINE __forceinline
+#define NOINLINE __declspec(noinline)
+#define NORETURN __declspec(noreturn)
+#define UNUSED
+#else
+#define ALWAYS_INLINE __attribute__((always_inline))
+#define NOINLINE __attribute__((noinline))
+#define NORETURN __attribute__((noreturn))
+#define UNUSED __attribute__((unused))
+#endif
+
+#define STR(a) #a
+#define XSTR(a) STR(a)
+#define SYMBOL_NAME(name) XSTR(__USER_LABEL_PREFIX__) #name
+
+#if defined(__ELF__) || defined(__MINGW32__) || defined(__wasm__) ||           \
+    defined(_AIX)    || defined(__CYGWIN__)
+#define COMPILER_RT_ALIAS(name, aliasname) \
+  COMPILER_RT_ABI __typeof(name) aliasname __attribute__((__alias__(#name)));
+#elif defined(__APPLE__)
+#if defined(VISIBILITY_HIDDEN)
+#define COMPILER_RT_ALIAS_VISIBILITY(name) \
+  __asm__(".private_extern " SYMBOL_NAME(name));
+#else
+#define COMPILER_RT_ALIAS_VISIBILITY(name)
+#endif
+#define COMPILER_RT_ALIAS(name, aliasname) \
+  __asm__(".globl " SYMBOL_NAME(aliasname)); \
+  COMPILER_RT_ALIAS_VISIBILITY(aliasname) \
+  __asm__(SYMBOL_NAME(aliasname) " = " SYMBOL_NAME(name)); \
+  COMPILER_RT_ABI __typeof(name) aliasname;
+#elif defined(_WIN32)
+#define COMPILER_RT_ALIAS(name, aliasname)
+#else
+#error Unsupported target
+#endif
+
+#if (defined(__FreeBSD__) || defined(__NetBSD__)) &&                           \
+    (defined(_KERNEL) || defined(_STANDALONE))
+//
+// Kernel and boot environment can't use normal headers,
+// so use the equivalent system headers.
+// NB: FreeBSD (and OpenBSD) deprecate machine/limits.h in
+// favour of sys/limits.h, so prefer the former, but fall
+// back on the latter if not available since NetBSD only has
+// the latter.
+//
+#if defined(__has_include) && __has_include(<sys/limits.h>)
+#include <sys/limits.h>
+#else
+#include <machine/limits.h>
+#endif
+#include <sys/stdint.h>
+#include <sys/types.h>
+#else
+// Include the standard compiler builtin headers we use functionality from.
+#include <float.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdint.h>
+#endif
+
+// Include the commonly used internal type definitions.
+#include "int_types.h"
+
+// Include internal utility function declarations.
+#include "int_util.h"
+
+COMPILER_RT_ABI int __paritysi2(si_int a);
+COMPILER_RT_ABI int __paritydi2(di_int a);
+
+COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
+COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
+COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
+
+COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int *rem);
+COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int *rem);
+#ifdef CRT_HAS_128BIT
+COMPILER_RT_ABI int __clzti2(ti_int a);
+COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int *rem);
+#endif
+
+// Definitions for builtins unavailable on MSVC
+#if defined(_MSC_VER) && !defined(__clang__)
+#include <intrin.h>
+
+int __inline __builtin_ctz(uint32_t value) {
+  unsigned long trailing_zero = 0;
+  if (_BitScanForward(&trailing_zero, value))
+    return trailing_zero;
+  return 32;
+}
+
+int __inline __builtin_clz(uint32_t value) {
+  unsigned long leading_zero = 0;
+  if (_BitScanReverse(&leading_zero, value))
+    return 31 - leading_zero;
+  return 32;
+}
+
+#if defined(_M_ARM) || defined(_M_X64)
+int __inline __builtin_clzll(uint64_t value) {
+  unsigned long leading_zero = 0;
+  if (_BitScanReverse64(&leading_zero, value))
+    return 63 - leading_zero;
+  return 64;
+}
+#else
+int __inline __builtin_clzll(uint64_t value) {
+  if (value == 0)
+    return 64;
+  uint32_t msh = (uint32_t)(value >> 32);
+  uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF);
+  if (msh != 0)
+    return __builtin_clz(msh);
+  return 32 + __builtin_clz(lsh);
+}
+#endif
+
+#define __builtin_clzl __builtin_clzll
+
+bool __inline __builtin_sadd_overflow(int x, int y, int *result) {
+  if ((x < 0) != (y < 0)) {
+    *result = x + y;
+    return false;
+  }
+  int tmp = (unsigned int)x + (unsigned int)y;
+  if ((tmp < 0) != (x < 0))
+    return true;
+  *result = tmp;
+  return false;
+}
+
+#endif // defined(_MSC_VER) && !defined(__clang__)
+
+#endif // INT_LIB_H
diff --git a/cpukit/compiler-rt/lib/builtins/int_types.h b/cpukit/compiler-rt/lib/builtins/int_types.h
new file mode 100644
index 0000000000..e94d3154c6
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/int_types.h
@@ -0,0 +1,198 @@
+//===-- int_lib.h - configuration header for compiler-rt  -----------------===//
+//
+// 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 is not part of the interface of this library.
+//
+// This file defines various standard types, most importantly a number of unions
+// used to access parts of larger types.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef INT_TYPES_H
+#define INT_TYPES_H
+
+#include "int_endianness.h"
+
+// si_int is defined in Linux sysroot's asm-generic/siginfo.h
+#ifdef si_int
+#undef si_int
+#endif
+typedef int32_t si_int;
+typedef uint32_t su_int;
+#if UINT_MAX == 0xFFFFFFFF
+#define clzsi __builtin_clz
+#define ctzsi __builtin_ctz
+#elif ULONG_MAX == 0xFFFFFFFF
+#define clzsi __builtin_clzl
+#define ctzsi __builtin_ctzl
+#else
+#error could not determine appropriate clzsi macro for this system
+#endif
+
+typedef int64_t di_int;
+typedef uint64_t du_int;
+
+typedef union {
+  di_int all;
+  struct {
+#if _YUGA_LITTLE_ENDIAN
+    su_int low;
+    si_int high;
+#else
+    si_int high;
+    su_int low;
+#endif // _YUGA_LITTLE_ENDIAN
+  } s;
+} dwords;
+
+typedef union {
+  du_int all;
+  struct {
+#if _YUGA_LITTLE_ENDIAN
+    su_int low;
+    su_int high;
+#else
+    su_int high;
+    su_int low;
+#endif // _YUGA_LITTLE_ENDIAN
+  } s;
+} udwords;
+
+#if defined(__LP64__) || defined(__wasm__) || defined(__mips64) ||             \
+    defined(__SIZEOF_INT128__) || defined(_WIN64)
+#define CRT_HAS_128BIT
+#endif
+
+// MSVC doesn't have a working 128bit integer type. Users should really compile
+// compiler-rt with clang, but if they happen to be doing a standalone build for
+// asan or something else, disable the 128 bit parts so things sort of work.
+#if defined(_MSC_VER) && !defined(__clang__)
+#undef CRT_HAS_128BIT
+#endif
+
+#ifdef CRT_HAS_128BIT
+typedef int ti_int __attribute__((mode(TI)));
+typedef unsigned tu_int __attribute__((mode(TI)));
+
+typedef union {
+  ti_int all;
+  struct {
+#if _YUGA_LITTLE_ENDIAN
+    du_int low;
+    di_int high;
+#else
+    di_int high;
+    du_int low;
+#endif // _YUGA_LITTLE_ENDIAN
+  } s;
+} twords;
+
+typedef union {
+  tu_int all;
+  struct {
+#if _YUGA_LITTLE_ENDIAN
+    du_int low;
+    du_int high;
+#else
+    du_int high;
+    du_int low;
+#endif // _YUGA_LITTLE_ENDIAN
+  } s;
+} utwords;
+
+static __inline ti_int make_ti(di_int h, di_int l) {
+  twords r;
+  r.s.high = h;
+  r.s.low = l;
+  return r.all;
+}
+
+static __inline tu_int make_tu(du_int h, du_int l) {
+  utwords r;
+  r.s.high = h;
+  r.s.low = l;
+  return r.all;
+}
+
+#endif // CRT_HAS_128BIT
+
+// FreeBSD's boot environment does not support using floating-point and poisons
+// the float and double keywords.
+#if defined(__FreeBSD__) && defined(_STANDALONE)
+#define CRT_HAS_FLOATING_POINT 0
+#else
+#define CRT_HAS_FLOATING_POINT 1
+#endif
+
+#if CRT_HAS_FLOATING_POINT
+typedef union {
+  su_int u;
+  float f;
+} float_bits;
+
+typedef union {
+  udwords u;
+  double f;
+} double_bits;
+#endif
+
+typedef struct {
+#if _YUGA_LITTLE_ENDIAN
+  udwords low;
+  udwords high;
+#else
+  udwords high;
+  udwords low;
+#endif // _YUGA_LITTLE_ENDIAN
+} uqwords;
+
+// Check if the target supports 80 bit extended precision long doubles.
+// Notably, on x86 Windows, MSVC only provides a 64-bit long double, but GCC
+// still makes it 80 bits. Clang will match whatever compiler it is trying to
+// be compatible with. On 32-bit x86 Android, long double is 64 bits, while on
+// x86_64 Android, long double is 128 bits.
+#if (defined(__i386__) || defined(__x86_64__)) &&                              \
+    !(defined(_MSC_VER) || defined(__ANDROID__))
+#define HAS_80_BIT_LONG_DOUBLE 1
+#elif defined(__m68k__) || defined(__ia64__)
+#define HAS_80_BIT_LONG_DOUBLE 1
+#else
+#define HAS_80_BIT_LONG_DOUBLE 0
+#endif
+
+#if CRT_HAS_FLOATING_POINT
+typedef union {
+  uqwords u;
+  long double f;
+} long_double_bits;
+
+#if __STDC_VERSION__ >= 199901L
+typedef float _Complex Fcomplex;
+typedef double _Complex Dcomplex;
+typedef long double _Complex Lcomplex;
+
+#define COMPLEX_REAL(x) __real__(x)
+#define COMPLEX_IMAGINARY(x) __imag__(x)
+#else
+typedef struct {
+  float real, imaginary;
+} Fcomplex;
+
+typedef struct {
+  double real, imaginary;
+} Dcomplex;
+
+typedef struct {
+  long double real, imaginary;
+} Lcomplex;
+
+#define COMPLEX_REAL(x) (x).real
+#define COMPLEX_IMAGINARY(x) (x).imaginary
+#endif
+#endif
+#endif // INT_TYPES_H
diff --git a/cpukit/compiler-rt/lib/builtins/int_util.h b/cpukit/compiler-rt/lib/builtins/int_util.h
new file mode 100644
index 0000000000..c372c2edc6
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/int_util.h
@@ -0,0 +1,47 @@
+//===-- int_util.h - internal utility functions ---------------------------===//
+//
+// 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 is not part of the interface of this library.
+//
+// This file defines non-inline utilities which are available for use in the
+// library. The function definitions themselves are all contained in int_util.c
+// which will always be compiled into any compiler-rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef INT_UTIL_H
+#define INT_UTIL_H
+
+/// \brief Trigger a program abort (or panic for kernel code).
+#define compilerrt_abort() __compilerrt_abort_impl(__FILE__, __LINE__, __func__)
+
+NORETURN void __compilerrt_abort_impl(const char *file, int line,
+                                      const char *function);
+
+#define COMPILE_TIME_ASSERT(expr) COMPILE_TIME_ASSERT1(expr, __COUNTER__)
+#define COMPILE_TIME_ASSERT1(expr, cnt) COMPILE_TIME_ASSERT2(expr, cnt)
+#define COMPILE_TIME_ASSERT2(expr, cnt)                                        \
+  typedef char ct_assert_##cnt[(expr) ? 1 : -1] UNUSED
+
+// Force unrolling the code specified to be repeated N times.
+#define REPEAT_0_TIMES(code_to_repeat) /* do nothing */
+#define REPEAT_1_TIMES(code_to_repeat) code_to_repeat
+#define REPEAT_2_TIMES(code_to_repeat)                                         \
+  REPEAT_1_TIMES(code_to_repeat)                                               \
+  code_to_repeat
+#define REPEAT_3_TIMES(code_to_repeat)                                         \
+  REPEAT_2_TIMES(code_to_repeat)                                               \
+  code_to_repeat
+#define REPEAT_4_TIMES(code_to_repeat)                                         \
+  REPEAT_3_TIMES(code_to_repeat)                                               \
+  code_to_repeat
+
+#define REPEAT_N_TIMES_(N, code_to_repeat) REPEAT_##N##_TIMES(code_to_repeat)
+#define REPEAT_N_TIMES(N, code_to_repeat) REPEAT_N_TIMES_(N, code_to_repeat)
+
+#endif // INT_UTIL_H
diff --git a/cpukit/compiler-rt/lib/builtins/moddi3.c b/cpukit/compiler-rt/lib/builtins/moddi3.c
new file mode 100644
index 0000000000..15cf80b995
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/moddi3.c
@@ -0,0 +1,22 @@
+//===-- moddi3.c - Implement __moddi3 -------------------------------------===//
+//
+// 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 __moddi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: a % b
+
+#define fixint_t di_int
+#define fixuint_t du_int
+#define ASSIGN_UMOD(res, a, b) __udivmoddi4((a), (b), &(res))
+#include "int_div_impl.inc"
+
+COMPILER_RT_ABI di_int __moddi3(di_int a, di_int b) { return __modXi3(a, b); }
diff --git a/cpukit/compiler-rt/lib/builtins/paritydi2.c b/cpukit/compiler-rt/lib/builtins/paritydi2.c
new file mode 100644
index 0000000000..350dceb8ce
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/paritydi2.c
@@ -0,0 +1,25 @@
+//===-- paritydi2.c - Implement __paritydi2 -------------------------------===//
+//
+// 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 __paritydi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: 1 if number of bits is odd else returns 0
+
+COMPILER_RT_ABI int __paritydi2(di_int a) {
+  dwords x;
+  x.all = a;
+  su_int x2 = x.s.high ^ x.s.low;
+  x2 ^= x2 >> 16;
+  x2 ^= x2 >> 8;
+  x2 ^= x2 >> 4;
+  return (0x6996 >> (x2 & 0xF)) & 1;
+}
diff --git a/cpukit/compiler-rt/lib/builtins/paritysi2.c b/cpukit/compiler-rt/lib/builtins/paritysi2.c
new file mode 100644
index 0000000000..a4b84e0806
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/paritysi2.c
@@ -0,0 +1,23 @@
+//===-- paritysi2.c - Implement __paritysi2 -------------------------------===//
+//
+// 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 __paritysi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: 1 if number of bits is odd else returns 0
+
+COMPILER_RT_ABI int __paritysi2(si_int a) {
+  su_int x = (su_int)a;
+  x ^= x >> 16;
+  x ^= x >> 8;
+  x ^= x >> 4;
+  return (0x6996 >> (x & 0xF)) & 1;
+}
diff --git a/cpukit/compiler-rt/lib/builtins/popcountdi2.c b/cpukit/compiler-rt/lib/builtins/popcountdi2.c
new file mode 100644
index 0000000000..20dd0b0239
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/popcountdi2.c
@@ -0,0 +1,32 @@
+//===-- popcountdi2.c - Implement __popcountdi2 ---------------------------===//
+//
+// 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 __popcountdi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: count of 1 bits
+
+COMPILER_RT_ABI int __popcountdi2(di_int a) {
+  du_int x2 = (du_int)a;
+  x2 = x2 - ((x2 >> 1) & 0x5555555555555555uLL);
+  // Every 2 bits holds the sum of every pair of bits (32)
+  x2 = ((x2 >> 2) & 0x3333333333333333uLL) + (x2 & 0x3333333333333333uLL);
+  // Every 4 bits holds the sum of every 4-set of bits (3 significant bits) (16)
+  x2 = (x2 + (x2 >> 4)) & 0x0F0F0F0F0F0F0F0FuLL;
+  // Every 8 bits holds the sum of every 8-set of bits (4 significant bits) (8)
+  su_int x = (su_int)(x2 + (x2 >> 32));
+  // The lower 32 bits hold four 16 bit sums (5 significant bits).
+  //   Upper 32 bits are garbage
+  x = x + (x >> 16);
+  // The lower 16 bits hold two 32 bit sums (6 significant bits).
+  //   Upper 16 bits are garbage
+  return (x + (x >> 8)) & 0x0000007F; // (7 significant bits)
+}
diff --git a/cpukit/compiler-rt/lib/builtins/popcountsi2.c b/cpukit/compiler-rt/lib/builtins/popcountsi2.c
new file mode 100644
index 0000000000..4d346c45d9
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/popcountsi2.c
@@ -0,0 +1,29 @@
+//===-- popcountsi2.c - Implement __popcountsi2 ---------------------------===//
+//
+// 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 __popcountsi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: count of 1 bits
+
+COMPILER_RT_ABI int __popcountsi2(si_int a) {
+  su_int x = (su_int)a;
+  x = x - ((x >> 1) & 0x55555555);
+  // Every 2 bits holds the sum of every pair of bits
+  x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
+  // Every 4 bits holds the sum of every 4-set of bits (3 significant bits)
+  x = (x + (x >> 4)) & 0x0F0F0F0F;
+  // Every 8 bits holds the sum of every 8-set of bits (4 significant bits)
+  x = (x + (x >> 16));
+  // The lower 16 bits hold two 8 bit sums (5 significant bits).
+  //    Upper 16 bits are garbage
+  return (x + (x >> 8)) & 0x0000003F; // (6 significant bits)
+}
diff --git a/cpukit/compiler-rt/lib/builtins/udivdi3.c b/cpukit/compiler-rt/lib/builtins/udivdi3.c
new file mode 100644
index 0000000000..74319cbe71
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/udivdi3.c
@@ -0,0 +1,23 @@
+//===-- udivdi3.c - Implement __udivdi3 -----------------------------------===//
+//
+// 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 __udivdi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+typedef du_int fixuint_t;
+typedef di_int fixint_t;
+#include "int_div_impl.inc"
+
+// Returns: a / b
+
+COMPILER_RT_ABI du_int __udivdi3(du_int a, du_int b) {
+  return __udivXi3(a, b);
+}
diff --git a/cpukit/compiler-rt/lib/builtins/udivmoddi4.c b/cpukit/compiler-rt/lib/builtins/udivmoddi4.c
new file mode 100644
index 0000000000..123e5fb05f
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/udivmoddi4.c
@@ -0,0 +1,200 @@
+//===-- 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 : 4723 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 >> ctzsi(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 = ctzsi(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
diff --git a/cpukit/compiler-rt/lib/builtins/umoddi3.c b/cpukit/compiler-rt/lib/builtins/umoddi3.c
new file mode 100644
index 0000000000..e672da96ef
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/umoddi3.c
@@ -0,0 +1,23 @@
+//===-- umoddi3.c - Implement __umoddi3 -----------------------------------===//
+//
+// 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 __umoddi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+typedef du_int fixuint_t;
+typedef di_int fixint_t;
+#include "int_div_impl.inc"
+
+// Returns: a % b
+
+COMPILER_RT_ABI du_int __umoddi3(du_int a, du_int b) {
+  return __umodXi3(a, b);
+}
diff --git a/cpukit/doxygen/top-level-groups.h b/cpukit/doxygen/top-level-groups.h
index 674672b21e..e7f4a5e9fb 100644
--- a/cpukit/doxygen/top-level-groups.h
+++ b/cpukit/doxygen/top-level-groups.h
@@ -201,3 +201,187 @@
  *
  * @brief This source file contains the implemention of a C library function.
  */
+
+/**
+ * @defgroup RTEMSImplCompilerBuiltins Compiler Builtins
+ *
+ * @ingroup RTEMSImpl
+ *
+ * @brief This group contains the implementation of compiler builtins.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/bswapdi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/bswapsi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/clzsi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/clzdi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/ctzsi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/ctzdi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/divdi3.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/ffsdi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/ffssi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/int_div_impl.inc
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This header file contains the implemention of compiler builtins.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/int_endianness.h
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/int_lib.h
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This header file provides interfaces for compiler builtins.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/int_types.h
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This header file provides interfaces for compiler builtins.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/int_util.h
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This header file provides interfaces for compiler builtins.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/moddi3.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/paritydi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/paritysi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/popcountdi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/popcountsi2.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/udivdi3.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/udivmoddi4.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
+
+/**
+ * @file cpukit/compiler-rt/lib/builtins/umoddi3.c
+ *
+ * @ingroup RTEMSImplCompilerBuiltins
+ *
+ * @brief This source file contains the implemention of a compiler builtin.
+ */
diff --git a/spec/build/bsps/optldflags.yml b/spec/build/bsps/optldflags.yml
index 14aaffc1e5..2f7b7ef937 100644
--- a/spec/build/bsps/optldflags.yml
+++ b/spec/build/bsps/optldflags.yml
@@ -12,8 +12,8 @@ default:
   value:
   - -nodefaultlibs
   - -Wl,--start-group
-  - -lrtemscpu
   - -lrtemsbsp
+  - -lrtemscpu
   - -lgcc
   - -Wl,--end-group
   - -Wl,--gc-sections
diff --git a/spec/build/cpukit/objqual.yml b/spec/build/cpukit/objqual.yml
index bc95099f88..e1f2d09fe2 100644
--- a/spec/build/cpukit/objqual.yml
+++ b/spec/build/cpukit/objqual.yml
@@ -10,6 +10,23 @@ includes: []
 install: []
 links: []
 source:
+- cpukit/compiler-rt/lib/builtins/bswapdi2.c
+- cpukit/compiler-rt/lib/builtins/bswapsi2.c
+- cpukit/compiler-rt/lib/builtins/clzdi2.c
+- cpukit/compiler-rt/lib/builtins/clzsi2.c
+- cpukit/compiler-rt/lib/builtins/ctzdi2.c
+- cpukit/compiler-rt/lib/builtins/ctzsi2.c
+- cpukit/compiler-rt/lib/builtins/divdi3.c
+- cpukit/compiler-rt/lib/builtins/ffsdi2.c
+- cpukit/compiler-rt/lib/builtins/ffssi2.c
+- cpukit/compiler-rt/lib/builtins/moddi3.c
+- cpukit/compiler-rt/lib/builtins/paritydi2.c
+- cpukit/compiler-rt/lib/builtins/paritysi2.c
+- cpukit/compiler-rt/lib/builtins/popcountdi2.c
+- cpukit/compiler-rt/lib/builtins/popcountsi2.c
+- cpukit/compiler-rt/lib/builtins/udivdi3.c
+- cpukit/compiler-rt/lib/builtins/udivmoddi4.c
+- cpukit/compiler-rt/lib/builtins/umoddi3.c
 - cpukit/libc/string/flsl.c
 - cpukit/libc/string/memcpy.c
 - cpukit/libc/string/memset.c