|
|
@@ -3060,12 +3060,12 @@ requested, things aren't aligned on 4-byte boundaries. When speed is
|
|
|
requested, things are aligned on 4-byte boundaries as much as possible.
|
|
|
\item Fast optimizations (\var{-O1}): activate the peephole optimizer
|
|
|
\item Slower optimizations (\var{-O2}): also activate the common subexpression
|
|
|
-elimination (formaerly called the "reloading optimizer)
|
|
|
+elimination (formerly called the "reloading optimizer")
|
|
|
\item Uncertain optimizations (\var{-Ou}): With this switch, the common subexpression
|
|
|
elimination algorithm can be forced into making uncertain optimizations.
|
|
|
|
|
|
Although you can enable uncertain optimizations in most cases, for people who
|
|
|
-do not understand the follwong technical explanation, it might be the safes to
|
|
|
+do not understand the following technical explanation, it might be the safest to
|
|
|
leave them off.
|
|
|
|
|
|
\begin{quote}
|
|
|
@@ -3218,8 +3218,8 @@ when they cannot be used.
|
|
|
\end{description}
|
|
|
|
|
|
\section{Tips to get faster code}
|
|
|
-Here some general tips for getting better code are presented. They are
|
|
|
-mainly concerned with coding style.
|
|
|
+Here some general tips for getting better code are presented. They
|
|
|
+mainly concern coding style.
|
|
|
|
|
|
\begin{itemize}
|
|
|
\item Find a better algorithm. No matter how much you and the compiler
|
|
|
@@ -3232,9 +3232,12 @@ using longint and cardinal variables.
|
|
|
|
|
|
\item Turn on the optimizer.
|
|
|
|
|
|
+\item Write your if/then/else statements so that the code in the "then"-part
|
|
|
+gets executed most of the time (improves the rate of successful jump prediction).
|
|
|
+
|
|
|
\item If you are allocating and disposing a lot of small memory blocks,
|
|
|
-check out the heapblocks variable. (heapblocks are on by default from
|
|
|
-release 0.99.8 on)
|
|
|
+check out the heapblocks variable (heapblocks are on by default from
|
|
|
+release 0.99.8 and later)
|
|
|
|
|
|
\item Profile your code (see the -pg switch) to find out where the
|
|
|
bottlenecks are. If you want, you can rewrite those parts in assembler.
|
Jonas Maebe