Optimize the size of the Base Library for the MSFT 32-bit tool chains by taking advantage of inline assembly.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1567 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/Ia32/LRotU64.c

@@ -0,0 +1,39 @@
+/** @file
+  64-bit left rotation for Ia32
+
+  Copyright (c) 2006, Intel Corporation<BR>
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#if _MSC_EXTENSIONS
+
+UINT64
+EFIAPI
+InternalMathLRotU64 (
+  IN      UINT64                    Operand,
+  IN      UINTN                     Count
+  )
+{
+  _asm {
+    mov     cl, byte ptr [Count]
+    mov     edx, dword ptr [Operand + 4]
+    mov     eax, dword ptr [Operand + 0]
+    shld    ebx, edx, cl
+    shld    edx, eax, cl
+    ror     ebx, cl
+    shld    eax, ebx, cl
+    test    cl, 32                      ; Count >= 32?
+    cmovnz  ecx, eax
+    cmovnz  eax, edx
+    cmovnz  edx, ecx
+  }
+}
+
+#endif