96 lines
2.2 KiB
ArmAsm
96 lines
2.2 KiB
ArmAsm
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/**
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*** Copyright (C) 1996-97 Intel Corporation. All rights reserved.
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***
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*** The information and source code contained herein is the exclusive
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*** property of Intel Corporation and may not be disclosed, examined
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*** or reproduced in whole or in part without explicit written authorization
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*** from the company.
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**/
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// TITLE("Large Integer Arithmetic")
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//++
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//
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// Module Name:
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//
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// largeint.s
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//
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// Abstract:
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//
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// This module implements routines for performing extended integer
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// arithmetic.
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//
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// Author:
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//
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// William K. Cheung (wcheung) 08-Feb-1996
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//
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// Environment:
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//
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// Any mode.
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//
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// Revision History:
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//
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// 09-Feb-1996 Updated to EAS 2.1
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//
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//--
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#include "ksia64.h"
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.file "largeint.s"
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//++
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//
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// LARGE_INTEGER
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// RtlExtendedMagicDivide (
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// IN LARGE_INTEGER Dividend,
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// IN LARGE_INTEGER MagicDivisor,
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// IN CCHAR ShiftCount
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// )
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//
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// Routine Description:
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//
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// This function divides a signed large integer by an unsigned large integer
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// and returns the signed large integer result. The division is performed
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// using reciprocal multiplication of a signed large integer value by an
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// unsigned large integer fraction which represents the most significant
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// 64-bits of the reciprocal divisor rounded up in its least significant bit
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// and normalized with respect to bit 63. A shift count is also provided
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// which is used to truncate the fractional bits from the result value.
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//
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// Arguments:
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//
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// Dividend (a0) - Supplies the dividend value.
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//
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// MagicDivisor (a1) - Supplies the magic divisor value which
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// is a 64-bit multiplicative reciprocal.
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//
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// Shiftcount (a2) - Supplies the right shift adjustment value.
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//
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// Return Value:
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//
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// The large integer result is returned as the function value in v0.
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//
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//--
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LEAF_ENTRY(RtlExtendedMagicDivide)
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cmp.gt pt0, pt1 = r0, a0
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;;
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(pt0) sub a0 = r0, a0
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;;
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setf.sig ft0 = a0
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setf.sig ft1 = a1
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;;
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zxt1 a2 = a2
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xma.hu ft2 = ft0, ft1, f0
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;;
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getf.sig v0 = ft2
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;;
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shr v0 = v0, a2
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;;
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(pt0) sub v0 = r0, v0
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LEAF_RETURN
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LEAF_EXIT(RtlExtendedMagicDivide)
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