X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseLib%2FIa32%2FRRotU64.c;fp=MdePkg%2FLibrary%2FBaseLib%2FIa32%2FRRotU64.c;h=78ac484afcbf26d531f4691eb3727c0ca3b8c324;hb=23086ba84cbb13350a2464b857b197eef67f1361;hp=0000000000000000000000000000000000000000;hpb=b0537818290619c85993136877afae37492fe5e0;p=mirror_edk2.git

diff --git a/MdePkg/Library/BaseLib/Ia32/RRotU64.c b/MdePkg/Library/BaseLib/Ia32/RRotU64.c
new file mode 100644
index 0000000000..78ac484afc
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/RRotU64.c
@@ -0,0 +1,39 @@
+/** @file
+  64-bit right 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
+InternalMathRRotU64 (
+  IN      UINT64                    Operand,
+  IN      UINTN                     Count
+  )
+{
+  _asm {
+    mov     cl, byte ptr [Count]
+    mov     eax, dword ptr [Operand + 0]
+    mov     edx, dword ptr [Operand + 4]
+    shrd    ebx, eax, cl
+    shrd    eax, edx, cl
+    rol     ebx, cl
+    shrd    edx, ebx, cl
+    test    cl, 32                      // Count >= 32?
+    cmovnz  ecx, eax
+    cmovnz  eax, edx
+    cmovnz  edx, ecx
+  }
+}
+
+#endif