Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / Ia32 / RShiftU64.asm

diff --git a/OldMdePkg/Library/BaseLib/Ia32/RShiftU64.asm b/OldMdePkg/Library/BaseLib/Ia32/RShiftU64.asm
new file mode 100644 (file)
index 0000000..faa4e96
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/RShiftU64.asm
@@ -0,0 +1,46 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006, Intel Corporation\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
+; Module Name:\r
+;\r
+;   RShiftU64.asm\r
+;\r
+; Abstract:\r
+;\r
+;   64-bit logical right shift function for IA-32\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    .686\r
+    .model  flat,C\r
+    .code\r
+\r
+;------------------------------------------------------------------------------\r
+; UINT64\r
+; EFIAPI\r
+; InternalMathRShiftU64 (\r
+;   IN      UINT64                    Operand,\r
+;   IN      UINTN                     Count\r
+;   );\r
+;------------------------------------------------------------------------------\r
+InternalMathRShiftU64   PROC\r
+    mov     cl, [esp + 12]              ; cl <- Count\r
+    xor     edx, edx\r
+    mov     eax, [esp + 8]\r
+    test    cl, 32                      ; Count >= 32?\r
+    cmovz   edx, eax\r
+    cmovz   eax, [esp + 4]\r
+    shrd    eax, edx, cl\r
+    shr     edx, cl\r
+    ret\r
+InternalMathRShiftU64   ENDP\r
+\r
+    END\r