68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/*
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* Copright (C) 2014 Linaro Ltd.
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* Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice and this list of conditions, without modification.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or (at your option) any later version.
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*/
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#include "lib.h"
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UINT64
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LShiftU64 (
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IN UINT64 Operand,
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IN UINTN Count
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)
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// Left shift 64bit by 32bit and get a 64bit result
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{
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return Operand << Count;
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}
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UINT64
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RShiftU64 (
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IN UINT64 Operand,
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IN UINTN Count
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)
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// Right shift 64bit by 32bit and get a 64bit result
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{
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return Operand >> Count;
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}
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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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// Multiply 64bit by 32bit and get a 64bit result
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{
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return Multiplicand * Multiplier;
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}
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UINT64
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DivU64x32 (
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IN UINT64 Dividend,
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IN UINTN Divisor,
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OUT UINTN *Remainder OPTIONAL
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)
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{
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/*
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* GCC turns a division into a multiplication and shift with precalculated
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* constants if the divisor is constant and the dividend fits into a 32 bit
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* variable. Otherwise, it will turn this into calls into the 32-bit div
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* library functions.
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*/
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if (Remainder)
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*Remainder = Dividend % Divisor;
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return Dividend / Divisor;
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}
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