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%$Header: /home/dashley/cvsrep/uculib01/uculib01/doc/manual/c_laf0/c_laf0.tex,v 1.7 2010/05/12 18:56:18 dashley Exp $ |
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\chapter[Large-Operand and Extended-Precision Arithmetic Functions] |
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{Large-Operand and Extended-Precision Arithmetic Functions} |
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\chaptermark{Large-Operand and Extended-Precision} |
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\label{claf0} |
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\section{Introduction and Overview} |
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\label{claf0:siov0} |
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\section{Unsigned Integer Division Functions} |
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\label{claf0:suid0} |
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TBD. |
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%\subsection[\emph{UcuLoU32U64U32DivQFRxn(\protect\mbox{\protect$\cdot$})}] |
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% {\emph{UcuLoU32U64U32DivQFRxn(\protect\mbox{\protect\boldmath $\cdot$})}} |
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%\label{claf0:suid0:sdsf0} |
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% |
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%\index{UcuLoU32U64U32DivQFRxn()@\emph{UcuLoU32U64U32DivQFRxn($\cdot$)}}% |
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% |
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%\noindent\textbf{PROTOTYPE} |
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%\begin {list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item |
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%\begin{verbatim} |
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%void UcuLoU32U64U32DivQFRxn( |
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% UCU_UINT32 *out_quotient, |
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% const UCU_UNION64 *in_dividend, |
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% const UCU_UINT32 *in_divisor |
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% ) |
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%\end{verbatim} |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{SYNOPSIS} |
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%\begin{list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item Calculates |
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% |
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% \begin{equation} |
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% *out\_quotient = \left\lfloor \frac{*in\_dividend}{*in\_divisor} \right\rfloor |
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% \end{equation} |
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% |
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% using a 32-iteration classic shift/compare/subtract division |
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% algorithm where it is known in advance that the quotient will not exceed 32 bits.\footnote{The |
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% general case of division of a 64-bit unsigned integer dividend by a 32-bit unsigned integer |
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% divisor may produce up to a 64-bit unsigned integer quotient. This function is not a |
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% general division function and should only be used when it is known that the quotient |
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% cannot exceed 32 bits.} |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{INPUT} |
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%\begin{list}{}{\setlength{\leftmargin}{0.5in}\setlength{\itemindent}{-0.25in}\setlength{\topsep}{0.0in}\setlength{\partopsep}{0.0in}} |
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%\item \emph{\textbf{in\_dividend}}\\ |
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% Pointer to a buffer containing the 64-bit unsigned integer dividend. |
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% The buffer is not modified by the function. |
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% |
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% This pointer may not be NULL or otherwise invalid. |
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% |
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% This buffer may not be coincident with the \emph{*in\_quotient} or |
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% \emph{*in\_divisor} buffers. |
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%\item \emph{\textbf{in\_divisor}}\\ |
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% Pointer to a buffer containing the 32-bit unsigned integer divisor. |
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% The buffer is not modified by the function. |
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% |
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% This pointer may not be NULL or otherwise invalid. |
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% |
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% This buffer may not be coincident with the \emph{*in\_quotient} or |
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% \emph{*in\_dividend} buffers. |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{OUTPUT} |
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%\begin{list}{}{\setlength{\leftmargin}{0.5in}\setlength{\itemindent}{-0.25in}\setlength{\topsep}{0.0in}\setlength{\partopsep}{0.0in}} |
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%\item \emph{\textbf{out\_quotient}}\\ |
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% Pointer to a buffer that will be assigned with the quotient. |
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% |
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% This pointer may not be NULL or otherwise invalid. |
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% |
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% This buffer may not be coincident with the \emph{*in\_dividend} or |
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% \emph{*in\_divisor} buffers. |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{INTERRUPT COMPATIBILITY} |
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%\begin{list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item This function may be used from both non-ISR and ISR software. |
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%\item This function is thread-safe. |
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%\item This function does not ensure atomic access to the buffers pointed to, so |
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% it is not thread-safe when processes in different threads use this |
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% function to access the \emph{same} buffer(s). |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{EXECUTION TIME} |
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%\begin{list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item TBD. |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{FUNCTION NAME MNEMONIC} |
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%\begin{list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item \emph{U32}: produces a UCU\_UINT32 result. |
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% \emph{U64}: accepts an unsigned 64-bit argument as input. |
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% \emph{U32}: accepts a UCU\_UINT32 argument as input. |
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% \emph{Div}: division. |
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% \emph{Q}: produces only a quotient (no remainder). |
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% \emph{F}: the quotient is rounded down, consistent with the traditional |
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% \emph{floor($\cdot$)} function. |
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%\end{list} |
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% |
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% |
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\section{Unsigned Integer Squaring Functions} |
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\label{claf0:ssqf0} |
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TBD. |
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%\subsection[\emph{UcuLoU64U32SquareInPlaceRxn(\protect\mbox{\protect$\cdot$})}] |
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% {\emph{UcuLoU64U32SquareInPlaceRxn(\protect\mbox{\protect\boldmath $\cdot$})}} |
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%\label{claf0:ssqf0:susf0} |
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% |
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%\index{UcuLoU64U32SquareInPlaceRxn()@\emph{UcuLoU64U32SquareInPlaceRxn($\cdot$)}}% |
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% |
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%\noindent\textbf{PROTOTYPE} |
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%\begin {list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item |
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%\begin{verbatim} |
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%void UcuLoU64U32SquareInPlaceRxn( UCU_UNION64 *in_u64 ) |
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%\end{verbatim} |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{SYNOPSIS} |
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%\begin{list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item |
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%Calculates the square of a 32-bit unsigned integer, yielding a |
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%64-bit unsigned integer result. The squaring is done ``in place'', meaning that the |
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%32-bit integer to be squared is placed right-aligned into |
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%a 64-bit buffer, and when the function returns, the same buffer contains the |
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%result. |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{INPUT} |
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%\begin{list}{}{\setlength{\leftmargin}{0.5in}\setlength{\itemindent}{-0.25in}\setlength{\topsep}{0.0in}\setlength{\partopsep}{0.0in}} |
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%\item \emph{\textbf{in\_u64}}\\ |
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% Pointer to a buffer containing the unsigned 32-bit integer whose square is to be calculated. |
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% The integer should be right-aligned (placed in the least significant |
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% bit positions of the buffer). |
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% |
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% The 32 most significant bit positions of the buffer are ignored and |
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% overwritten, and will not affect the calculation result. These |
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% bit positions do not need to be assigned prior to the function call. |
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% |
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% This pointer may not be NULL or otherwise invalid. |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{OUTPUT} |
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%\begin{list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item The buffer pointed to by \emph{in\_u64} |
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% will contain the unsigned 64-bit integer square of the unsigned 32-bit integer |
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% provided in the rightmost position in the buffer before the function call. |
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% |
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% The original unsigned 32-bit integer provided is overwritten by the result. |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{INTERRUPT COMPATIBILITY} |
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%\begin{list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item This function may be used from both non-ISR and ISR software. |
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%\item This function is thread-safe. |
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%\item This function does not ensure atomic access to \emph{*in\_u64}, so |
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% it is not thread-safe when processes in different threads use this |
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% function to access the \emph{same} buffer. |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{EXECUTION TIME} |
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%\begin{list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item TBD. |
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%\end{list} |
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%\vspace{2.8ex} |
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% |
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%\noindent\textbf{FUNCTION NAME MNEMONIC} |
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%\begin{list}{}{\setlength{\leftmargin}{0.25in}\setlength{\topsep}{0.0in}} |
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%\item \emph{U64}: produces an unsigned 64-bit result. |
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% \emph{U32}: accepts a UCU\_UINT32 as input. |
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% \emph{Square}: calculates the square. |
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% \emph{InPlace}: calculates ``in place'' (uses the same input and output buffer). |
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%\end{list} |
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% |
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% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\noindent\begin{figure}[!b] |
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\noindent\rule[-0.25in]{\textwidth}{1pt} |
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\begin{tiny} |
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\begin{verbatim} |
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$RCSfile: c_laf0.tex,v $ |
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$Source: /home/dashley/cvsrep/uculib01/uculib01/doc/manual/c_laf0/c_laf0.tex,v $ |
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$Revision: 1.7 $ |
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$Author: dashley $ |
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$Date: 2010/05/12 18:56:18 $ |
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\end{verbatim} |
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\end{tiny} |
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\noindent\rule[0.25in]{\textwidth}{1pt} |
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\end{figure} |
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%$Log: c_laf0.tex,v $ |
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%Revision 1.7 2010/05/12 18:56:18 dashley |
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%Removal of UcuLoU64U32SquareInPlaceRxn() function. |
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% |
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%Revision 1.6 2010/05/12 18:41:46 dashley |
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%Removal of UcuLoU32U64U32DivQFRxn() function. |
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% |
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%Revision 1.5 2010/04/15 17:09:38 dashley |
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%Addition of UcuLoU32U64U32DivQFRxn() function. |
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% |
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%Revision 1.4 2010/04/15 15:56:41 dashley |
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%Addition of UcuU64U32SquareInPlaceRxn() function. |
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% |
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%Revision 1.3 2010/01/28 21:18:32 dashley |
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%a)Chapter start quotes removed. |
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%b)Aesthetic comment line added at the bottom of most files. |
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% |
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%Revision 1.2 2010/01/24 05:37:27 dashley |
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%Addition and reorganization of content. |
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% |
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%Revision 1.1 2007/10/08 18:07:42 dtashley |
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%Initial checkin. |
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% |
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%End of $RCSfile: c_laf0.tex,v $. |
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