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[SPCA] Stack

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almost complete, still missing variadic functions
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Janis Hutz
2026-01-12 08:06:51 +01:00
parent 53c5e984b2
commit 639c147264
4 changed files with 65 additions and 8 deletions
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10
semester3/spca/parts/00_asm/03_operations.tex
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@@ -9,7 +9,7 @@ The following instruction formats are commonly used:
Arithmetic / logic operations need a size postfix (replace \texttt{X} below with \texttt{b} (1B), \texttt{w} (2B), \texttt{l} (4B) or \texttt{q} (8B)).
\begin{tables}{lll}{Mnemonic & Format & Computation}
\texttt{addl} & \texttt{Src, Dest} & \texttt{Dest} $\gets$ \texttt{Dest + Src} \\
\texttt{addX} & \texttt{Src, Dest} & \texttt{Dest} $\gets$ \texttt{Dest + Src} \\
\texttt{subX} & \texttt{Src, Dest} & \texttt{Dest} $\gets$ \texttt{Dest - Src} \\
\texttt{imulX} & \texttt{Src, Dest} & \texttt{Dest} $\gets$ \texttt{Dest * Src} \\
\texttt{salX} & \texttt{Src, Dest} & \texttt{Dest} $\gets$ \texttt{Dest << Src} \\
@@ -48,9 +48,9 @@ and \texttt{SF} is set if \texttt{a \& b < 0}.
\content{Zeroing register} We can use a move instruction, but that is less efficient than using \texttt{xorl reg, reg}, where \texttt{reg} is the 32-bit version of the reg we want to zero.
\content{Reading condition codes} To read condition codes, we can use the \texttt{setX} instructions, where the \texttt{X} is to be substituted by an element of table \ref{tab:condition-codes}
\content{Reading condition codes} To read condition codes, we can use the \texttt{setC} instructions, where the \texttt{C} is to be substituted by an element of table \ref{tab:condition-codes}
\content{Jumping} To jump, we have the \texttt{jmp <label>} instruction (unconditional jump) or the \texttt{jX} instructions, with \texttt{X} from table \ref{tab:condition-codes}
\content{Jumping} To jump, we have the \texttt{jmp <label>} instruction (unconditional jump) or the \texttt{jC} instructions, with \texttt{C} from table \ref{tab:condition-codes}
\begin{table}[h!]
\begin{tables}{lll}{\texttt{setX} & Condition & Description}
@@ -71,7 +71,7 @@ and \texttt{SF} is set if \texttt{a \& b < 0}.
\content{Conditional Moves}
Similar to \texttt{jX}, the same postfixes can be applied to \texttt{cmovX}, for example:
Similar to \texttt{jC}, the same postfixes can be applied to \texttt{cmovC}, for example:
\begin{minted}{gas}
cmpl %eax, %edx
@@ -80,4 +80,4 @@ Similar to \texttt{jX}, the same postfixes can be applied to \texttt{cmovX}, for
Will move \verb|%edx| into \verb|%eax|, only if \verb|%edx| is less or equal (\verb|le|) \verb|%eax|.
This can be used to, for example, compile ternary expressions from \verb|C| to Assembly. However, this requires evaluating both possible expressions, which may lead to a (significant) performance overhead.
This can be used to, for example, compile ternary expressions from \verb|C| to Assembly. However, this requires evaluating both possible expressions, which may lead to a (significant) performance overhead.