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some more tweaks

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llvm-svn: 99643
This commit is contained in:
Gabor Greif 2010-03-26 19:40:38 +00:00
parent 746a971656
commit 77e468da11
1 changed files with 5 additions and 4 deletions
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docs/ProgrammersManual.html
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@ -1977,9 +1977,9 @@ for (Value::use_iterator i = F->use_begin(), e = F->use_end(); i != e; ++i
</pre>
</div>
Note that dereferencing a <tt>Value::use_iterator</tt> is not a very cheap
<p>Note that dereferencing a <tt>Value::use_iterator</tt> is not a very cheap
operation. Instead of performing <tt>*i</tt> above several times, consider
doing it only once in the loop body and reusing its result.
doing it only once in the loop body and reusing its result.</p>
<p>Alternatively, it's common to have an instance of the <a
href="/doxygen/classllvm_1_1User.html">User Class</a> and need to know what
@ -2001,12 +2001,13 @@ for (User::op_iterator i = pi-&gt;op_begin(), e = pi-&gt;op_end(); i != e; ++i)
</div>
<p>Declaring objects as <tt>const</tt> is an important tool of enforcing
mutation free algorithms (such as analyses etc.). For this purpose above
mutation free algorithms (such as analyses, etc.). For this purpose above
iterators come in constant flavors as <tt>Value::const_use_iterator</tt>
and <tt>Value::const_op_iterator</tt>. They automatically arise when
calling <tt>use/op_begin()</tt> on <tt>const Value*</tt>s or
<tt>const User*</tt>s respectively. Upon dereferencing, they return
<tt>const Use*</tt>s. Otherwise the above patterns remain unchanged.
<tt>const Use*</tt>s. Otherwise the above patterns remain unchanged.</p>
</div>
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