1 files changed, 64 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/asm/ASMMultU32ByU32DivByU32.asm b/src/VBox/Runtime/common/asm/ASMMultU32ByU32DivByU32.asm
new file mode 100644
index 00000000..c87b88c8
--- /dev/null
+++ b/src/VBox/Runtime/common/asm/ASMMultU32ByU32DivByU32.asm
@@ -0,0 +1,64 @@
+; $Id: ASMMultU32ByU32DivByU32.asm $
+;; @file
+; IPRT - Assembly Functions, ASMMultU32ByU32DivByU32.
+;
+
+;
+; Copyright (C) 2006-2020 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"
+
+
+;;
+; Multiple a 32-bit by a 32-bit integer and divide the result by a 32-bit integer
+; using a 64 bit intermediate result.
+;
+; @returns (u32A * u32B) / u32C.
+; @param   u32A/ecx/edi     The 32-bit value (A).
+; @param   u32B/edx/esi     The 32-bit value to multiple by A.
+; @param   u32C/r8d/edx     The 32-bit value to divide A*B by.
+;
+; @cproto  DECLASM(uint32_t) ASMMultU32ByU32DivByU32(uint32_t u32A, uint32_t u32B, uint32_t u32C);
+;
+BEGINPROC_EXPORTED ASMMultU32ByU32DivByU32
+%ifdef RT_ARCH_AMD64
+ %ifdef ASM_CALL64_MSC
+        mov     eax, ecx
+        mul     edx
+        div     r8d
+ %else
+        mov     eax, edi
+        mov     ecx, edx
+        mul     esi
+        div     ecx
+ %endif
+
+%elifdef RT_ARCH_X86
+        mov     eax, [esp + 04h]
+        mul     dword [esp + 08h]
+        div     dword [esp + 0ch]
+%else
+ %error "Unsupported arch."
+ unsupported arch
+%endif
+
+        ret
+ENDPROC ASMMultU32ByU32DivByU32