--- /dev/null
+/** @file\r
+ 64-bit left shift function for IA-32.\r
+\r
+ Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
+ All rights reserved. This program and the accompanying materials\r
+ are licensed and made available under the terms and conditions of the BSD License\r
+ which accompanies this distribution. The full text of the license may be found at\r
+ http://opensource.org/licenses/bsd-license.php\r
+\r
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+**/\r
+\r
+UINT64\r
+EFIAPI\r
+InternalMathLShiftU64 (\r
+ IN UINT64 Operand,\r
+ IN UINTN Count\r
+ )\r
+{\r
+ _asm {\r
+ mov cl, byte ptr [Count]\r
+ xor eax, eax\r
+ mov edx, dword ptr [Operand + 0]\r
+ test cl, 32 // Count >= 32?\r
+ cmovz eax, edx\r
+ cmovz edx, dword ptr [Operand + 4]\r
+ shld edx, eax, cl\r
+ shl eax, cl\r
+ }\r
+}\r
+\r