\subsection{\index{shiftri}shiftri}

\index{shift right immediate logic}
SHIFT Right Immediate logic


\begin{tabular}{l}
  {\bf shiftri Imm8, r2, r1} \\
  {\bf sshiftri Imm8, r2, r1} \\
\end{tabular}

~~~~~~
Computes r1 = r2 {\htmlGt}{\htmlGt} Imm8

~~~~~~
The value of Imm8 is truncated to the number of bits needed by the bit
shuffler unit.

~~~~~~
If -h is specified in SIMD, that means r3 sdup (r3)

~~~~~~

\begin{center}

\begin{tabular}{|l|l|l|l|l|l|}
 \hline
\multicolumn{1}{|r| }{size :
} & \multicolumn{1}{c| }{8
} & \multicolumn{1}{c| }{4
} & \multicolumn{1}{c| }{8
} & \multicolumn{1}{c| }{6
} & \multicolumn{1}{c| }{6
 } \\
 \hline
\multicolumn{1}{|r| }{bits :
} & {31 ~ ~ ~ ~ ~ ~ ~ ~ 24
} & {23 ~ ~ ~ ~ 20
} & {19 ~ ~ ~ ~ ~ ~ ~ ~ 12
} & {11 ~ ~ ~ ~ ~ ~ 6
} & {5 ~ ~ ~ ~ ~ ~ 0
 } \\
 \hline
\multicolumn{1}{|r| }{function :
} & \multicolumn{1}{c| }{OP\_SHIFTRI
} & \multicolumn{1}{c| }{Flags
} & \multicolumn{1}{c| }{Imm8
} & \multicolumn{1}{c| }{Reg 2
} & \multicolumn{1}{c| }{Reg 1
}
\\ \hline

\end{tabular}



\begin{tabular}{|l|l|l|l|}
 \hline
\multicolumn{1}{|c| }{~ ~ Flags ~ ~
} & \multicolumn{1}{c| }{Syntax
} & {Values
} & {Function
 } \\
 \hline
\multicolumn{1}{|c| }{23-22
} & {.q, .d or .b postfix
} & {*
} & {Defines the size parameter
 } \\
 \hline
\multicolumn{1}{|c| }{21
} & {s- prefix
} & {1 if set
} & {Defines if the operation is SIMD
 } \\
 \hline
\multicolumn{1}{|c| }{20
} & {(none yet)
} & {0
} & {Reserved
}
\\ \hline

\end{tabular}


~

{\bf Performance (FC0 only) :}
\end{center}

{\em Execution Unit :} Bit Shuffling Unit\\
{\em Latency :} 1 cycle\\
{\em Throughput :} 1 per cycle per BSU.\\

~

\pagebreak

