</term>
<listitem>
<para>Controls whether <constant>memcheck</constant> detects
- dangerous uses of undefined value errors. When
- <varname>yes</varname>, Memcheck behaves like Addrcheck, a lightweight
- memory-checking tool that used to be part of Valgrind, which didn't
- detect undefined value errors. Use this option if you don't like
- seeing undefined value errors.
+ dangerous uses of undefined value errors. Set this to
+ <varname>no</varname> if you don't like seeing undefined value
+ errors; it also has the side effect of speeding
+ <constant>memcheck</constant> up somewhat.
</para>
</listitem>
</varlistentry>