MdePkg/Library/BaseLib/Ia32/MultU64x64.S File Reference


Detailed Description

#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.

# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php.
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
# Module Name:
#
# MultU64x64.S
#
# Abstract:
#
# Calculate the product of a 64-bit integer and another 64-bit integer
#
#------------------------------------------------------------------------------

ASM_GLOBAL ASM_PFX(InternalMathMultU64x64)

#------------------------------------------------------------------------------
# UINT64
# EFIAPI
# InternalMathMultU64x64 (
# IN UINT64 Multiplicand,
# IN UINT64 Multiplier
# );
#------------------------------------------------------------------------------
ASM_PFX(InternalMathMultU64x64):
push ebx
movl 8(esp), ebx # ebx <- M1[0..31]
movl 16(esp), edx # edx <- M2[0..31]
movl ebx, ecx
movl edx, eax
imull 20(esp), ebx # ebx <- M1[0..31] * M2[32..63]
imull 12(esp), edx # edx <- M1[32..63] * M2[0..31]
addl edx, ebx # carries are abandoned
mull ecx # edx:eax <- M1[0..31] * M2[0..31]
addl ebx, edx # carries are abandoned
pop ebx
ret


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