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Express shamt_i in terms of XLEN.

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John Winans 2020-03-12 14:16:29 -05:00
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2 changed files with 8 additions and 6 deletions
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6
book/refcard/chapter.tex
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@ -54,7 +54,7 @@ sb & rs2, imm(rs1) & \hyperref[insnformat:stype]{S} & \hyperref[insn:sb]{Stor
\hline \hline
sh & rs2, imm(rs1) & \hyperref[insnformat:stype]{S} & \hyperref[insn:sh]{Store Halfword} & {\tt m16(rs1+\hyperref[imm.s:decode]{imm\_s}) $\leftarrow$ rs2[15:0], pc $\leftarrow$ pc+4}\\ sh & rs2, imm(rs1) & \hyperref[insnformat:stype]{S} & \hyperref[insn:sh]{Store Halfword} & {\tt m16(rs1+\hyperref[imm.s:decode]{imm\_s}) $\leftarrow$ rs2[15:0], pc $\leftarrow$ pc+4}\\
\hline \hline
sll & rd, rs1, rs2 & \hyperref[insnformat:rtype]{R} & \hyperref[insn:sll]{Shift Left Logical} & {\tt rd $\leftarrow$ rs1 << (rs2\&0x1f), pc $\leftarrow$ pc+4}\\ sll & rd, rs1, rs2 & \hyperref[insnformat:rtype]{R} & \hyperref[insn:sll]{Shift Left Logical} & {\tt rd $\leftarrow$ rs1 << (rs2\%XLEN), pc $\leftarrow$ pc+4}\\
\hline \hline
slli & rd, rs1, shamt & \hyperref[insnformat:itype]{I} & \hyperref[insn:slli]{Shift Left Logical Immediate} & {\tt rd $\leftarrow$ rs1 << \hyperref[shamt.i:decode]{shamt\_i}, pc $\leftarrow$ pc+4}\\ slli & rd, rs1, shamt & \hyperref[insnformat:itype]{I} & \hyperref[insn:slli]{Shift Left Logical Immediate} & {\tt rd $\leftarrow$ rs1 << \hyperref[shamt.i:decode]{shamt\_i}, pc $\leftarrow$ pc+4}\\
\hline \hline
@ -66,11 +66,11 @@ sltiu & rd, rs1, imm & \hyperref[insnformat:itype]{I} & \hyperref[insn:sltiu]{S
\hline \hline
sltu & rd, rs1, rs2 & \hyperref[insnformat:rtype]{R} & \hyperref[insn:sltu]{Set Less Than Unsigned} & {\tt rd $\leftarrow$ (rs1 < rs2) ? 1 : 0, pc $\leftarrow$ pc+4}\\ sltu & rd, rs1, rs2 & \hyperref[insnformat:rtype]{R} & \hyperref[insn:sltu]{Set Less Than Unsigned} & {\tt rd $\leftarrow$ (rs1 < rs2) ? 1 : 0, pc $\leftarrow$ pc+4}\\
\hline \hline
sra & rd, rs1, rs2 & \hyperref[insnformat:rtype]{R} & \hyperref[insn:sra]{Shift Right Arithmetic} & {\tt rd $\leftarrow$ rs1 >> (rs2\&0x1f), pc $\leftarrow$ pc+4}\\ sra & rd, rs1, rs2 & \hyperref[insnformat:rtype]{R} & \hyperref[insn:sra]{Shift Right Arithmetic} & {\tt rd $\leftarrow$ rs1 >> (rs2\%XLEN), pc $\leftarrow$ pc+4}\\
\hline \hline
srai & rd, rs1, shamt & \hyperref[insnformat:itype]{I} & \hyperref[insn:srai]{Shift Right Arithmetic Immediate} & {\tt rd $\leftarrow$ rs1 >> \hyperref[shamt.i:decode]{shamt\_i}, pc $\leftarrow$ pc+4}\\ srai & rd, rs1, shamt & \hyperref[insnformat:itype]{I} & \hyperref[insn:srai]{Shift Right Arithmetic Immediate} & {\tt rd $\leftarrow$ rs1 >> \hyperref[shamt.i:decode]{shamt\_i}, pc $\leftarrow$ pc+4}\\
\hline \hline
srl & rd, rs1, rs2 & \hyperref[insnformat:rtype]{R} & \hyperref[insn:srl]{Shift Right Logical} & {\tt rd $\leftarrow$ rs1 >> (rs2\&0x1f), pc $\leftarrow$ pc+4}\\ srl & rd, rs1, rs2 & \hyperref[insnformat:rtype]{R} & \hyperref[insn:srl]{Shift Right Logical} & {\tt rd $\leftarrow$ rs1 >> (rs2\%XLEN), pc $\leftarrow$ pc+4}\\
\hline \hline
srli & rd, rs1, shamt & \hyperref[insnformat:itype]{I} & \hyperref[insn:srli]{Shift Right Logical Immediate} & {\tt rd $\leftarrow$ rs1 >> \hyperref[shamt.i:decode]{shamt\_i}, pc $\leftarrow$ pc+4}\\ srli & rd, rs1, shamt & \hyperref[insnformat:itype]{I} & \hyperref[insn:srli]{Shift Right Logical Immediate} & {\tt rd $\leftarrow$ rs1 >> \hyperref[shamt.i:decode]{shamt\_i}, pc $\leftarrow$ pc+4}\\
\hline \hline

8
book/rv32/chapter.tex
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@ -622,10 +622,12 @@ to form the \verb@imm_i@ value.
\end{figure} \end{figure}
A special case of the I-type is used for shift-immediate instructions A special case of the I-type is used for shift-immediate instructions
where only five bits of the imm field are used to represent the number where the imm field is used to represent the number of bit positions
of bit positions to shift as shown in \autoref{Figure:shamt_i_type_decode}. to shift as shown in \autoref{Figure:shamt_i_type_decode}.
In this variation, the least significant five bits of the imm field are In this variation, the least significant five bits of the imm field are
zero-extended to form the \verb@shamt_i@ value. zero-extended to form the \verb@shamt_i@
value.\footnote{When XLEN is 64 or 128, the {\tt shamt\_i} field will
consist of 6 or 7 bits respectively.}
\begin{figure}[ht] \begin{figure}[ht]
\centering \centering