Eliminate a redundant check. This speeds up optimization of 253.perlbmk from 13...

[oota-llvm.git] / docs / FAQ.html

diff --git a/docs/FAQ.html b/docs/FAQ.html
index b67fae3abe547d3d281e693f30b42f533a5d7667..6c4a79ce8ffb2cf71d083a27dc6d924d77244988 100644 (file)
--- a/docs/FAQ.html
+++ b/docs/FAQ.html
@@ -51,7 +51,9 @@
   <li>When I use the test suite, all of the C Backend tests fail.  What is
       wrong?</li>
   <li>After CVS update, rebuilding gives the error "No rule to make
-  target".</li>
+      target".</li>
+  <li><a href="#llvmc">The <tt>llvmc</tt> program gives me errors/doesn't
+      work.</li></a>
   </ol></li>
 
   <li><a href="#felangs">Source Languages</a>
@@ -311,11 +313,20 @@ clean</tt> and then <tt>make</tt> in the directory that fails to build.</p>
 
 <p>For example, if you built LLVM with the command:</p>
 
-<p><tt>gmake ENABLE_PROFILING=1</tt>
+<div class="doc_code">
+<pre>
+% gmake ENABLE_PROFILING=1
+</pre>
+</div>
 
 <p>...then you must run the tests with the following commands:</p>
 
-<p><tt>cd llvm/test<br>gmake  ENABLE_PROFILING=1</tt></p>
+<div class="doc_code">
+<pre>
+% cd llvm/test
+% gmake ENABLE_PROFILING=1
+</pre>
+</div>
 
 </div>
 
@@ -354,11 +365,11 @@ build.</p>
 <p>If the error is of the form:</p>
 
 <div class="doc_code">
-<tt>
+<pre>
 gmake[2]: *** No rule to make target `/path/to/somefile', needed by
 `/path/to/another/file.d'.<br>
 Stop.
-</tt>
+</pre>
 </div>
 
 <p>This may occur anytime files are moved within the CVS repository or removed
@@ -377,6 +388,16 @@ which list dependencies for source files, and rebuild:</p>
 rebuilding.</p>
 </div>
 
+<div class="question">
+  <a name="llvmc"<p>The <tt>llvmc</tt> program gives me errors/doesn't
+  work.</p></a>
+</div>
+
+<div class="answer">
+  <p><tt>llvmc</tt> is experimental and isn't really supported. We suggest
+  using <tt>llvm-gcc</tt> instead.</p>
+</div>
+
 <!-- *********************************************************************** -->
 <div class="doc_section"><a name="felangs">Source Languages</a></div>
 
@@ -471,11 +492,14 @@ find libcrtend.a.
 <p>
 The only way this can happen is if you haven't installed the runtime library. To
 correct this, do:</p>
+
+<div class="doc_code">
 <pre>
-  % cd llvm/runtime
-  % make clean ; make install-bytecode
+% cd llvm/runtime
+% make clean ; make install-bytecode
 </pre>
 </div>
+</div>
 
 <div class="question">
 <p>
@@ -512,14 +536,20 @@ C++ support for a processor that does not otherwise have a C++ compiler.
 <ol>
 <li><p>Compile your program as normal with llvm-g++:</p></li>
 
-<div class="doc_code">$ llvm-g++ x.cpp -o program</div>
+<div class="doc_code">
+<pre>
+% llvm-g++ x.cpp -o program
+</pre>
+</div>
 
 <p>or:</p>
 
 <div class="doc_code">
- llvm-g++ a.cpp -c<br>
- llvm-g++ b.cpp -c<br>
- llvm-g++ a.o b.o -o program
+<pre>
+% llvm-g++ a.cpp -c
+% llvm-g++ b.cpp -c
+% llvm-g++ a.o b.o -o program
+</pre>
 </div>
 
 <p>With llvm-gcc3, this will generate program and program.bc.  The .bc file is 
@@ -528,11 +558,19 @@ the LLVM version of the program all linked together.</p>
 <li><p>Convert the LLVM code to C code, using the LLC tool with the C
 backend:</p></li>
 
-<div class="doc_code">$ llc -march=c program.bc -o program.c</div>
+<div class="doc_code">
+<pre>
+% llc -march=c program.bc -o program.c
+</pre>
+</div>
 
 <li><p>Finally, compile the c file:</p></li>
 
-<div class="doc_code">$ cc x.c</div>
+<div class="doc_code">
+<pre>
+% cc x.c
+</pre>
+</div>
 
 </ol>
 
@@ -650,12 +688,13 @@ a value that is not defined.  You can get these if you do not initialize a
 variable before you use it.  For example, the C function:</p>
 
 <div class="doc_code">
-  <tt>int X() { int i; return i; }</tt>
+<pre>
+int X() { int i; return i; }
+</pre>
 </div>
 
-<p>Is compiled to "<tt>ret int undef</tt>" because "i" never has a value 
-specified for it.
-</p>
+<p>Is compiled to "<tt>ret i32 undef</tt>" because "<tt>i</tt>" never has
+a value specified for it.</p>
 </div>
 
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