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imm_j and imm_b can only be even

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John Winans 2022-10-07 06:11:59 -05:00
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book/rv32/chapter.tex
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@ -209,7 +209,7 @@ The address of the current instruction minus a numeric offset.
\subsection{pcrel\_13} \subsection{pcrel\_13}
\label{pcrel.13} \label{pcrel.13}
An address that is within $[-4096..4095]$ of the current instruction location. An address that is within $[-4096..4094]$ $[$\verb@-0x1000..0x0ffe@$]$ of the current instruction location.
These addresses are typically expressed in assembly source code by using labels. These addresses are typically expressed in assembly source code by using labels.
See \autoref{insnformat:btype} for examples. See \autoref{insnformat:btype} for examples.
@ -217,7 +217,7 @@ See \autoref{insnformat:btype} for examples.
\subsection{pcrel\_21} \subsection{pcrel\_21}
\label{pcrel.21} \label{pcrel.21}
An address that is within $[-1048576..1048575]$ of the current instruction An address that is within $[-1048576..1048574]$ $[$\verb@-0x100000..0x0ffffe@$]$ of the current instruction
location. location.
These addresses are typically expressed in assembly source code by using labels. These addresses are typically expressed in assembly source code by using labels.
See \autoref{insnformat:jtype} for an example. See \autoref{insnformat:jtype} for an example.
@ -414,8 +414,8 @@ arranged in a different order.
Note that the \verb@imm_j@ value is Note that the \verb@imm_j@ value is
%expressed in the instruction as a target address that is converted to %expressed in the instruction as a target address that is converted to
a 21-bit value in the range of an even 21-bit value in the range of
$[-1048576..1048575]$ representing a \verb@pc@-relative offset to the $[-1048576..1048574]$ $[$\verb@-0x100000..0x0ffffe@$]$ representing a \verb@pc@-relative offset to the
target address. target address.
%In the J-type format the 20 {\em imm} bits are arranged such %In the J-type format the 20 {\em imm} bits are arranged such
@ -995,8 +995,8 @@ to form the \verb@imm_b@ value.
\end{figure} \end{figure}
Note that \verb@imm_b@ is expressed in the instruction as a target Note that \verb@imm_b@ is expressed in the instruction as a target
address that is converted to a 13-bit value in the range of address that is converted to an even 13-bit value in the range of
$[-4096..4095]$ representing a \verb@pc@-relative offset to the $[-4096..4094]$ $[$\verb@-0x1000..0x0ffe@$]$ representing a \verb@pc@-relative offset to the
target address. For example, consider the branch instructions in target address. For example, consider the branch instructions in
the following code: the following code: