Index: compiler-rt/lib/builtins/CMakeLists.txt
===================================================================
--- compiler-rt/lib/builtins/CMakeLists.txt
+++ compiler-rt/lib/builtins/CMakeLists.txt
@@ -52,8 +52,10 @@
   addvti3.c
   apple_versioning.c
   ashldi3.c
+  ashlsi3.c
   ashlti3.c
   ashrdi3.c
+  ashrsi3.c
   ashrti3.c
   bswapdi2.c
   bswapsi2.c
@@ -110,6 +112,7 @@
   fp_mode.c
   int_util.c
   lshrdi3.c
+  lshrsi3.c
   lshrti3.c
   moddi3.c
   modsi3.c
Index: compiler-rt/lib/builtins/ashlsi3.c
===================================================================
--- /dev/null
+++ compiler-rt/lib/builtins/ashlsi3.c
@@ -0,0 +1,34 @@
+// ====-- ashlsi3.c - Implement __ashlsi3 ---------------------------------===//
+//
+// 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 __ashlsi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: a << b
+
+// Preconsition:  0 <= b < bits_in_sword
+
+COMPILER_RT_ABI si_int __ashlsi3(si_int a, int b) {
+  const int bits_in_word = (int)(sizeof(hi_int) * CHAR_BIT);
+  swords input;
+  swords result;
+  input.all = a;
+  if (b & bits_in_word) /* bits_in_word <= b < bits_in_sword */ {
+    result.s.low = 0;
+    result.s.high = input.s.low << (b - bits_in_word);
+  } else /* 0 <= b < bits_in_word */ {
+    if (b == 0)
+      return a;
+    result.s.low = input.s.low << b;
+    result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_word - b));
+  }
+  return result.all;
+}
Index: compiler-rt/lib/builtins/ashrsi3.c
===================================================================
--- /dev/null
+++ compiler-rt/lib/builtins/ashrsi3.c
@@ -0,0 +1,35 @@
+//===-- ashrsi3.c - Implement __ashrsi3 -----------------------------------===//
+//
+// 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 __ashrsi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: arithmetic a >> b
+
+// Precondition:  0 <= b < bits_in_dword
+
+COMPILER_RT_ABI si_int __ashrsi3(si_int a, int b) {
+  const int bits_in_word = (int)(sizeof(hi_int) * CHAR_BIT);
+  swords input;
+  swords result;
+  input.all = a;
+  if (b & bits_in_word) /* bits_in_word <= b < bits_in_sword */ {
+    // result.s.high = input.s.high < 0 ? -1 : 0
+    result.s.high = input.s.high >> (bits_in_word - 1);
+    result.s.low = input.s.high >> (b - bits_in_word);
+  } else /* 0 <= b < bits_in_word */ {
+    if (b == 0)
+      return a;
+    result.s.high = input.s.high >> b;
+    result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b);
+  }
+  return result.all;
+}
Index: compiler-rt/lib/builtins/int_types.h
===================================================================
--- compiler-rt/lib/builtins/int_types.h
+++ compiler-rt/lib/builtins/int_types.h
@@ -18,6 +18,9 @@
 
 #include "int_endianness.h"
 
+typedef int16_t hi_int;
+typedef uint16_t hu_int;
+
 // si_int is defined in Linux sysroot's asm-generic/siginfo.h
 #ifdef si_int
 #undef si_int
@@ -28,6 +31,32 @@
 typedef int64_t di_int;
 typedef uint64_t du_int;
 
+typedef union {
+  si_int all;
+  struct {
+#if _YUGA_LITTLE_ENDIAN
+    hu_int low;
+    hi_int high;
+#else
+    hi_int high;
+    hu_int low;
+#endif // _YUGA_LITTLE_ENDIAN
+  } s;
+} swords;
+
+typedef union {
+  su_int all;
+  struct {
+#if _YUGA_LITTLE_ENDIAN
+    hu_int low;
+    hu_int high;
+#else
+    hu_int high;
+    hu_int low;
+#endif // _YUGA_LITTLE_ENDIAN
+  } s;
+} uswords;
+
 typedef union {
   di_int all;
   struct {
Index: compiler-rt/lib/builtins/lshrsi3.c
===================================================================
--- /dev/null
+++ compiler-rt/lib/builtins/lshrsi3.c
@@ -0,0 +1,34 @@
+//===-- lshrsi3.c - Implement __lshrsi3 -----------------------------------===//
+//
+// 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 __lshrsi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: logical a >> b
+
+// Precondition:  0 <= b < bits_in_sword
+
+COMPILER_RT_ABI si_int __lshrsi3(si_int a, int b) {
+  const int bits_in_word = (int)(sizeof(hi_int) * CHAR_BIT);
+  uswords input;
+  uswords result;
+  input.all = a;
+  if (b & bits_in_word) /* bits_in_word <= b < bits_in_sword */ {
+    result.s.high = 0;
+    result.s.low = input.s.high >> (b - bits_in_word);
+  } else /* 0 <= b < bits_in_word */ {
+    if (b == 0)
+      return a;
+    result.s.high = input.s.high >> b;
+    result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b);
+  }
+  return result.all;
+}
Index: compiler-rt/test/builtins/Unit/ashlsi3_test.c
===================================================================
--- /dev/null
+++ compiler-rt/test/builtins/Unit/ashlsi3_test.c
@@ -0,0 +1,76 @@
+// RUN: %clang_builtins %s %librt -o %t && %run %t
+// REQUIRES: librt_has_ashlsi3
+//===-- ashlsi3_test.c - Test __ashlsi3 -----------------------------------===//
+//
+// 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 tests __ashlsi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+#include <stdio.h>
+
+// Returns: a << b
+
+// Precondition:  0 <= b < bits_in_dword
+
+COMPILER_RT_ABI si_int __ashlsi3(si_int a, int b);
+
+int test__ashlsi3(si_int a, int b, si_int expected)
+{
+    si_int x = __ashlsi3(a, b);
+    if (x != expected)
+        printf("error in __ashlsi3: %X << %d = %X, expected %X\n",
+               a, b, __ashlsi3(a, b), expected);
+    return x != expected;
+}
+
+int main()
+{
+    if (test__ashlsi3(0x01234567, 0, 0x1234567))
+        return 1;
+    if (test__ashlsi3(0x01234567, 1, 0x2468ACE))
+        return 1;
+    if (test__ashlsi3(0x01234567, 2, 0x048D159C))
+        return 1;
+    if (test__ashlsi3(0x01234567, 3, 0x091A2B38))
+        return 1;
+    if (test__ashlsi3(0x01234567, 4, 0x12345670))
+        return 1;
+
+    if (test__ashlsi3(0x01234567, 12, 0x34567000))
+        return 1;
+    if (test__ashlsi3(0x01234567, 13, 0x68ACE000))
+        return 1;
+    if (test__ashlsi3(0x01234567, 14, 0xD159C000))
+        return 1;
+    if (test__ashlsi3(0x01234567, 15, 0xA2B38000))
+        return 1;
+
+    if (test__ashlsi3(0x01234567, 16, 0x45670000))
+        return 1;
+
+    if (test__ashlsi3(0x01234567, 17, 0x8ACE0000))
+        return 1;
+    if (test__ashlsi3(0x01234567, 18, 0x159C0000))
+        return 1;
+    if (test__ashlsi3(0x01234567, 19, 0x2B380000))
+        return 1;
+    if (test__ashlsi3(0x01234567, 20, 0x56700000))
+        return 1;
+
+    if (test__ashlsi3(0x01234567, 28, 0x70000000))
+        return 1;
+    if (test__ashlsi3(0x01234567, 29, 0xE0000000))
+        return 1;
+    if (test__ashlsi3(0x01234567, 30, 0xC0000000))
+        return 1;
+    if (test__ashlsi3(0x01234567, 31, 0x80000000))
+        return 1;
+    return 0;
+}
Index: compiler-rt/test/builtins/Unit/ashrsi3_test.c
===================================================================
--- /dev/null
+++ compiler-rt/test/builtins/Unit/ashrsi3_test.c
@@ -0,0 +1,117 @@
+// RUN: %clang_builtins %s %librt -o %t && %run %t
+// REQUIRES: librt_has_ashrsi3
+//===-- ashrsi3_test.c - Test __ashrsi3 -----------------------------------===//
+//
+// 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 tests __ashrsi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+#include <stdio.h>
+
+// Returns: arithmetic a >> b
+
+// Precondition:  0 <= b < bits_in_dword
+
+COMPILER_RT_ABI si_int __ashrsi3(si_int a, int b);
+
+int test__ashrsi3(si_int a, int b, si_int expected)
+{
+    si_int x = __ashrsi3(a, b);
+    if (x != expected)
+        printf("error in __ashrsi3: %X >> %d = %X, expected %X\n",
+               a, b, __ashrsi3(a, b), expected);
+    return x != expected;
+}
+
+int main()
+{
+    if (test__ashrsi3(0x01234567, 0, 0x1234567))
+        return 1;
+    if (test__ashrsi3(0x01234567, 1, 0x91A2B3))
+        return 1;
+    if (test__ashrsi3(0x01234567, 2, 0x48D159))
+        return 1;
+    if (test__ashrsi3(0x01234567, 3, 0x2468AC))
+        return 1;
+    if (test__ashrsi3(0x01234567, 4, 0x123456))
+        return 1;
+
+    if (test__ashrsi3(0x01234567, 12, 0x1234))
+        return 1;
+    if (test__ashrsi3(0x01234567, 13, 0x91A))
+        return 1;
+    if (test__ashrsi3(0x01234567, 14, 0x48D))
+        return 1;
+    if (test__ashrsi3(0x01234567, 15, 0x246))
+        return 1;
+
+    if (test__ashrsi3(0x01234567, 16, 0x123))
+        return 1;
+
+    if (test__ashrsi3(0x01234567, 17, 0x91))
+        return 1;
+    if (test__ashrsi3(0x01234567, 18, 0x48))
+        return 1;
+    if (test__ashrsi3(0x01234567, 19, 0x24))
+        return 1;
+    if (test__ashrsi3(0x01234567, 20, 0x12))
+        return 1;
+
+    if (test__ashrsi3(0x01234567, 28, 0))
+        return 1;
+    if (test__ashrsi3(0x01234567, 29, 0))
+        return 1;
+    if (test__ashrsi3(0x01234567, 30, 0))
+        return 1;
+    if (test__ashrsi3(0x01234567, 31, 0))
+        return 1;
+
+    if (test__ashrsi3(0xFEDCBA98, 0, 0xFEDCBA98))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 1, 0xFF6E5D4C))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 2, 0xFFB72EA6))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 3, 0xFFDB9753))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 4, 0xFFEDCBA9))
+        return 1;
+
+    if (test__ashrsi3(0xFEDCBA98, 12, 0xFFFFEDCB))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 13, 0xFFFFF6E5))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 14, 0xFFFFFB72))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 15, 0xFFFFFDB9))
+        return 1;
+
+    if (test__ashrsi3(0xFEDCBA98, 16, 0xFFFFFEDC))
+        return 1;
+
+    if (test__ashrsi3(0xFEDCBA98, 17, 0xFFFFFF6E))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 18, 0xFFFFFFB7))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 19, 0xFFFFFFDB))
+        return 1;
+    if (test__ashrsi3(0xFEDCBA98, 20, 0xFFFFFFED))
+        return 1;
+
+    if (test__ashrsi3(0xAEDCBA98, 28, 0xFFFFFFFA))
+        return 1;
+    if (test__ashrsi3(0xAEDCBA98, 29, 0xFFFFFFFD))
+        return 1;
+    if (test__ashrsi3(0xAEDCBA98, 30, 0xFFFFFFFE))
+        return 1;
+    if (test__ashrsi3(0xAEDCBA98, 31, 0xFFFFFFFF))
+        return 1;
+    return 0;
+}
Index: compiler-rt/test/builtins/Unit/lshrsi3_test.c
===================================================================
--- /dev/null
+++ compiler-rt/test/builtins/Unit/lshrsi3_test.c
@@ -0,0 +1,117 @@
+// RUN: %clang_builtins %s %librt -o %t && %run %t
+// REQUIRES: librt_has_lshrsi3
+//===-- lshrsi3_test.c - Test __lshrsi3 -----------------------------------===//
+//
+// 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 tests __lshrsi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+#include <stdio.h>
+
+// Returns: logical a >> b
+
+// Precondition:  0 <= b < bits_in_dword
+
+COMPILER_RT_ABI si_int __lshrsi3(si_int a, int b);
+
+int test__lshrsi3(si_int a, int b, si_int expected)
+{
+    si_int x = __lshrsi3(a, b);
+    if (x != expected)
+        printf("error in __lshrsi3: %X >> %d = %X, expected %X\n",
+               a, b, __lshrsi3(a, b), expected);
+    return x != expected;
+}
+
+int main()
+{
+    if (test__lshrsi3(0x01234567, 0, 0x1234567))
+        return 1;
+    if (test__lshrsi3(0x01234567, 1, 0x91A2B3))
+        return 1;
+    if (test__lshrsi3(0x01234567, 2, 0x48D159))
+        return 1;
+    if (test__lshrsi3(0x01234567, 3, 0x2468AC))
+        return 1;
+    if (test__lshrsi3(0x01234567, 4, 0x123456))
+        return 1;
+
+    if (test__lshrsi3(0x01234567, 12, 0x1234))
+        return 1;
+    if (test__lshrsi3(0x01234567, 13, 0x91A))
+        return 1;
+    if (test__lshrsi3(0x01234567, 14, 0x48D))
+        return 1;
+    if (test__lshrsi3(0x01234567, 15, 0x246))
+        return 1;
+
+    if (test__lshrsi3(0x01234567, 16, 0x123))
+        return 1;
+
+    if (test__lshrsi3(0x01234567, 17, 0x91))
+        return 1;
+    if (test__lshrsi3(0x01234567, 18, 0x48))
+        return 1;
+    if (test__lshrsi3(0x01234567, 19, 0x24))
+        return 1;
+    if (test__lshrsi3(0x01234567, 20, 0x12))
+        return 1;
+
+    if (test__lshrsi3(0x01234567, 28, 0))
+        return 1;
+    if (test__lshrsi3(0x01234567, 29, 0))
+        return 1;
+    if (test__lshrsi3(0x01234567, 30, 0))
+        return 1;
+    if (test__lshrsi3(0x01234567, 31, 0))
+        return 1;
+
+    if (test__lshrsi3(0xFEDCBA98, 0, 0xFEDCBA98))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 1, 0x7F6E5D4C))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 2, 0x3FB72EA6))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 3, 0x1FDB9753))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 4, 0xFEDCBA9))
+        return 1;
+
+    if (test__lshrsi3(0xFEDCBA98, 12, 0xFEDCB))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 13, 0x7F6E5))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 14, 0x3FB72))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 15, 0x1FDB9))
+        return 1;
+
+    if (test__lshrsi3(0xFEDCBA98, 16, 0xFEDC))
+        return 1;
+
+    if (test__lshrsi3(0xFEDCBA98, 17, 0x7F6E))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 18, 0x3FB7))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 19, 0x1FDB))
+        return 1;
+    if (test__lshrsi3(0xFEDCBA98, 20, 0xFED))
+        return 1;
+
+    if (test__lshrsi3(0xAEDCBA98, 28, 0xA))
+        return 1;
+    if (test__lshrsi3(0xAEDCBA98, 29, 0x5))
+        return 1;
+    if (test__lshrsi3(0xAEDCBA98, 30, 0x2))
+        return 1;
+    if (test__lshrsi3(0xAEDCBA98, 31, 0x1))
+        return 1;
+    return 0;
+}