flow graph, to reduce the size of the function as much as possible. Finally,
<tt>bugpoint</tt> deletes any individual LLVM instructions whose absence does
not eliminate the failure. At the end, <tt>bugpoint</tt> should tell you what
-passes crash, give you a bytecode file, and give you instructions on how to
+passes crash, give you a bitcode file, and give you instructions on how to
reproduce the failure with <tt>opt</tt> or <tt>llc</tt>.</p>
</div>
with the C backend (into a shared object), and one piece which it runs with
either the JIT or the static LLC compiler. It uses several techniques to
reduce the amount of code pushed through the LLVM code generator, to reduce the
-potential scope of the problem. After it is finished, it emits two bytecode
+potential scope of the problem. After it is finished, it emits two bitcode
files (called "test" [to be compiled with the code generator] and "safe" [to be
compiled with the C backend], respectively), and instructions for reproducing
the problem. The code generator debugger assumes that the C backend produces
you might try <tt>llvm-link -v</tt> on the same set of input files. If
that also crashes, you may be experiencing a linker bug.
-<li>If your program is <b>supposed</b> to crash, <tt>bugpoint</tt> will be
- confused. One way to deal with this is to cause bugpoint to ignore the exit
- code from your program, by giving it the <tt>-check-exit-code=false</tt>
- option.
-
<li><tt>bugpoint</tt> is useful for proactively finding bugs in LLVM.
Invoking <tt>bugpoint</tt> with the <tt>-find-bugs</tt> option will cause
the list of specified optimizations to be randomized and applied to the
program. This process will repeat until a bug is found or the user
kills <tt>bugpoint</tt>.
+
+<li><p><tt>bugpoint</tt> does not understand the <tt>-O</tt> option
+ that is used to specify optimization level to <tt>opt</tt>. You
+ can use e.g.</p>
+
+<div class="doc_code">
+<p><tt>opt -O2 -debug-pass=Arguments foo.bc -disable-output</tt></p>
+</div>
+
+ <p>to get a list of passes that are used with <tt>-O2</tt> and
+ then pass this list to <tt>bugpoint</tt>.</p>
</ol>
<hr>
<address>
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<a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
<a href="http://llvm.org">LLVM Compiler Infrastructure</a><br>