1 files changed, 63 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/math/watcom/U8RS-x86-32.asm b/src/VBox/Runtime/common/math/watcom/U8RS-x86-32.asm
new file mode 100644
index 00000000..2c4f7d38
--- /dev/null
+++ b/src/VBox/Runtime/common/math/watcom/U8RS-x86-32.asm
@@ -0,0 +1,63 @@
+; $Id: U8RS-x86-32.asm $
+;; @file
+; BS3Kit - 32-bit Watcom C/C++, 64-bit unsigned integer right shift.
+;
+
+;
+; Copyright (C) 2007-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+%include "iprt/asmdefs.mac"
+
+
+BEGINCODE
+
+
+;;
+; 64-bit unsigned integer right shift.
+;
+; @returns  EDX:EAX
+; @param    EDX:EAX     Value to shift.
+; @param    BL          Shift count (it's specified as ECX:EBX, but we only use BL).
+;
+global __U8RS
+__U8RS:
+        push    ecx                     ; We're allowed to trash ECX, but why bother.
+
+        mov     cl, bl
+        and     cl, 3fh
+        test    cl, 20h
+        jnz     .big_shift
+
+        ; Shifting less than 32.
+        shrd    eax, edx, cl
+        shr     edx, cl
+
+.return:
+        pop     ecx
+        ret
+
+.big_shift:
+        ; Shifting 32 or more.
+        mov     eax, edx
+        shr     eax, cl                 ; Only uses lower 5 bits.
+        xor     edx, edx
+        jmp     .return
+