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Add more insn examples and refs to shifting

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John Winans 2021-02-10 21:09:09 -06:00
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commit 49289fcbfa
1 changed files with 30 additions and 3 deletions
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book/rv32/chapter.tex
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@ -550,7 +550,8 @@ value \verb@0xff55ff11@.
\label{insn:sll}
Shift \verb@rs1@ left by the number of bits specified in the least significant
five bits of \verb@rs2@ and store the result in \verb@rd@.
five bits of \verb@rs2@ and store the result in \verb@rd@.\footnote{For
more information on how shifting works, see \autoref{shifting}.}
For example, if \verb@x17@ = \verb@0x12345678@ and \verb@x18@ = \verb@0x08@
then the instruction \verb@sll x12,x17,x18@ will set \verb@x12@ to the
@ -563,6 +564,14 @@ If the signed integer value in \verb@rs1@ is less than the
signed integer value in \verb@rs2@ then set \verb@rd@ to \verb@1@.
Otherwise, set \verb@rd@ to \verb@0@.
For example, if \verb@x17@ = \verb@0x12345678@ and \verb@x18@ = \verb@0x0000ffff@
then the instruction \verb@slt x12,x17,x18@ will set \verb@x12@ to the
value \verb@0x00000000@.
If \verb@x17@ = \verb@0x82345678@ and \verb@x18@ = \verb@0x0000ffff@
then the instruction \verb@slt x12,x17,x18@ will set \verb@x12@ to the
value \verb@0x00000001@.
\item\instructionHeader{sltu\ \ rd,rs1,rs2}
\label{insn:sltu}
@ -570,26 +579,44 @@ If the unsigned integer value in \verb@rs1@ is less than the
unsigned integer value in \verb@rs2@ then set \verb@rd@ to \verb@1@.
Otherwise, set \verb@rd@ to \verb@0@.
For example, if \verb@x17@ = \verb@0x12345678@ and \verb@x18@ = \verb@0x0000ffff@
then the instruction \verb@sltu x12,x17,x18@ will set \verb@x12@ to the
value \verb@0x00000000@.
If \verb@x17@ = \verb@0x12345678@ and \verb@x18@ = \verb@0x8000ffff@
then the instruction \verb@sltu x12,x17,x18@ will set \verb@x12@ to the
value \verb@0x00000001@.
\item\instructionHeader{sra\ \ \ rd,rs1,rs2}
\label{insn:sra}
Arithmetic-shift \verb@rs1@ right by the number of bits given in \verb@rs2@ and
store the result in \verb@rd@.
store the result in \verb@rd@.\footnote{For
more information on how shifting works, see \autoref{shifting}.}
For example, if \verb@x17@ = \verb@0x87654321@ and \verb@x18@ = \verb@0x08@
then the instruction \verb@sra x12,x17,x18@ will set \verb@x12@ to the
value \verb@0xff876543@.
If \verb@x17@ = \verb@0x76543210@ and \verb@x18@ = \verb@0x08@
then the instruction \verb@sra x12,x17,x18@ will set \verb@x12@ to the
value \verb@0x00765432@.
\item\instructionHeader{srl\ \ \ rd,rs1,rs2}
\label{insn:srl}
Logic-shift \verb@rs1@ right by the number of bits given in \verb@rs2@ and
store the result in \verb@rd@.
store the result in \verb@rd@.\footnote{For
more information on how shifting works, see \autoref{shifting}.}
For example, if \verb@x17@ = \verb@0x87654321@ and \verb@x18@ = \verb@0x08@
then the instruction \verb@srl x12,x17,x18@ will set \verb@x12@ to the
value \verb@0x00876543@.
If \verb@x17@ = \verb@0x76543210@ and \verb@x18@ = \verb@0x08@
then the instruction \verb@srl x12,x17,x18@ will set \verb@x12@ to the
value \verb@0x00765432@.
\item\instructionHeader{sub\ \ \ rd,rs1,rs2}
\label{insn:sub}