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Add section on the newly added Instruction and subclasses constructor

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13802 91177308-0d34-0410-b5e6-96231b3b80d8
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Alkis Evlogimenos 2004-05-27 00:57:51 +00:00
parent f3ecf3a40c
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@ -808,7 +808,22 @@ into an existing sequence of instructions that form a <tt>BasicBlock</tt>:</p>
<tt>BasicBlock</tt>, and a newly-created instruction we wish to insert
before <tt>*pi</tt>, we do the following: </p>
<pre> BasicBlock *pb = ...;<br> Instruction *pi = ...;<br> Instruction *newInst = new Instruction(...);<br> pb-&gt;getInstList().insert(pi, newInst); // inserts newInst before pi in pb<br></pre></li>
<pre> BasicBlock *pb = ...;<br> Instruction *pi = ...;<br> Instruction *newInst = new Instruction(...);<br> pb-&gt;getInstList().insert(pi, newInst); // inserts newInst before pi in pb<br></pre>
<p>Appending to the end of a <tt>BasicBlock</tt> is so common that
the <tt>Instruction</tt> class and <tt>Instruction</tt>-derived
classes provide constructors which take a pointer to a
<tt>BasicBlock</tt> to be appended to. For example code that
looked like: </p>
<pre> BasicBlock *pb = ...;<br> Instruction *newInst = new Instruction(...);<br> pb-&gt;getInstList().push_back(newInst); // appends newInst to pb<br></pre>
<p>becomes: </p>
<pre> BasicBlock *pb = ...;<br> Instruction *newInst = new Instruction(..., pb);<br></pre>
<p>which is much cleaner, especially if you are creating
long instruction streams.</p></li>
<li>Insertion into an implicit instruction list