ArmPkg/ArmDisassemblerLib: fix check for MSR instruction

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / MultU64x64.asm

diff --git a/MdePkg/Library/BaseLib/Ia32/MultU64x64.asm b/MdePkg/Library/BaseLib/Ia32/MultU64x64.asm
index 377aa5197227fc6a335fb46273e51bfa098ace26..061301f5597244a20ab80af0e64b11116767bfc5 100644 (file)
--- a/MdePkg/Library/BaseLib/Ia32/MultU64x64.asm
+++ b/MdePkg/Library/BaseLib/Ia32/MultU64x64.asm
@@ -1,10 +1,10 @@
 ;------------------------------------------------------------------------------\r
 ;\r
-; Copyright (c) 2006, Intel Corporation\r
-; All rights reserved. This program and the accompanying materials\r
+; Copyright (c) 2006, 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
+; 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
@@ -32,15 +32,15 @@
 ;   );\r
 ;------------------------------------------------------------------------------\r
 InternalMathMultU64x64  PROC    USES    ebx\r
-    mov     ebx, [esp + 8]\r
-    mov     edx, [esp + 16]\r
+    mov     ebx, [esp + 8]              ; ebx <- M1[0..31]\r
+    mov     edx, [esp + 16]             ; edx <- M2[0..31]\r
     mov     ecx, ebx\r
     mov     eax, edx\r
-    imul    ebx, [esp + 20]\r
-    imul    edx, [esp + 12]\r
-    add     ebx, edx\r
-    mul     ecx\r
-    add     edx, ebx\r
+    imul    ebx, [esp + 20]             ; ebx <- M1[0..31] * M2[32..63]\r
+    imul    edx, [esp + 12]             ; edx <- M1[32..63] * M2[0..31]\r
+    add     ebx, edx                    ; carries are abandoned\r
+    mul     ecx                         ; edx:eax <- M1[0..31] * M2[0..31]\r
+    add     edx, ebx                    ; carries are abandoned\r
     ret\r
 InternalMathMultU64x64  ENDP\r
 \r