mirror of https://github.com/acidanthera/audk.git
72 lines
2.0 KiB
ArmAsm
72 lines
2.0 KiB
ArmAsm
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#/*++
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#
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#Copyright (c) 2006, Intel Corporation
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#All rights reserved. This program and the accompanying materials
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#are licensed and made available under the terms and conditions of the BSD License
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#which accompanies this distribution. The full text of the license may be found at
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#http://opensource.org/licenses/bsd-license.php
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#
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#THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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#WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#Module Name:
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#
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# MultU64x32.c
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#
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#Abstract:
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#
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# 64-bit Multiplication function for IA-32
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#
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#--*/
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#include "EfiBind.h"
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#---------------------------------------------------------------------------
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.686:
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#.MODEL flat,C
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.code:
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#---------------------------------------------------------------------------
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.globl ASM_PFX(MultU64x32)
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#UINT64
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#MultU64x32 (
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# IN UINT64 Multiplicand,
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# IN UINTN Multiplier
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# )
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#/*++
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#
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#Routine Description:
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#
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# This routine allows a 64 bit value to be multiplied with a 32 bit
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# value returns 64bit result.
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# No checking if the result is greater than 64bits
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#
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#Arguments:
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#
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# Multiplicand - multiplicand
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# Multiplier - multiplier
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#
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#Returns:
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#
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# Multiplicand * Multiplier
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#
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#--*/
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ASM_PFX(MultU64x32):
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movl 4(%esp), %eax # dword ptr Multiplicand[0]
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mull 0xC(%esp) # Multiplier
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pushl %eax
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pushl %edx
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movl 0x10(%esp), %eax # dword ptr Multiplicand[4]
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mull 0x14(%esp) # Multiplier
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#
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# The value in edx stored by second multiplication overflows
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# the output and should be discarded. So here we overwrite it
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# with the edx value of first multiplication.
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#
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popl %edx
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addl %eax, %edx
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popl %eax
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ret
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#MultU64x32 ENDP
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