MdePkg BaseLib: Convert Ia32/RRotU64.asm to NASM

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / RRotU64.nasm

diff --git a/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm b/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm
new file mode 100644 (file)
index 0000000..8110202
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm
@@ -0,0 +1,50 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>\r
+; 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
+;   RRotU64.nasm\r
+;\r
+; Abstract:\r
+;\r
+;   64-bit right rotation for Ia32\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    SECTION .text\r
+\r
+;------------------------------------------------------------------------------\r
+; UINT64\r
+; EFIAPI\r
+; InternalMathRRotU64 (\r
+;   IN      UINT64                    Operand,\r
+;   IN      UINTN                     Count\r
+;   );\r
+;------------------------------------------------------------------------------\r
+global ASM_PFX(InternalMathRRotU64)\r
+ASM_PFX(InternalMathRRotU64):\r
+    push    ebx\r
+    mov     cl, [esp + 16]\r
+    mov     eax, [esp + 8]\r
+    mov     edx, [esp + 12]\r
+    shrd    ebx, eax, cl\r
+    shrd    eax, edx, cl\r
+    rol     ebx, cl\r
+    shrd    edx, ebx, cl\r
+    test    cl, 32                      ; Count >= 32?\r
+    jz      .0\r
+    mov     ecx, eax                    ; switch eax & edx if Count >= 32\r
+    mov     eax, edx\r
+    mov     edx, ecx\r
+.0:\r
+    pop     ebx\r
+    ret\r
+\r