Update docs with x64 build instructions.

doc/changes.html

@@ -55,9 +55,7 @@ to see whether newer versions are available.
 <div class="major" style="background: #d0d0d0;">
 <h2 id="snap">Development Snapshot</h2>
 <ul>
-<li>Build of preliminary x64 interpreter can be enabled with
-<tt>make "CC=gcc -m64"</tt>.
-Only works on Linux/x64. Does not work on WIN64 or OSX/x64 (yet).</li>
+<li>Build of preliminary x64 interpreter works on Linux/x64 or WIN64.</li>
 <li>Implement yield from C hooks.</li>
 <li>Add abstract C call handling to IR.</li>
 <li>Improve KNUM fuse vs. load heuristics.</li>

doc/install.html

@@ -54,6 +54,17 @@ LuaJIT currently builds out-of-the box on all popular x86 systems
 (Linux, Windows, OSX etc.). It builds and runs fine as a 32 bit
 application under x64-based systems, too.
 </p>
+<p class="indent" style="color: #00a000;">
+The x64 port of LuaJIT is still experimental and not enabled by default.
+It only contains the interpreter and only builds on Linux/x64 and WIN64
+right now. If you want to give it a try, follow the special build instructions
+below.
+</p>
+<p class="indent" style="color: #00a000;">
+Note that the pure interpreter is quite a bit faster than Lua, but of
+course not as fast as the x86 JIT compiler. Work on the x64 JIT compiler
+is still ongoing.
+</p>
 
 <h2>Configuring LuaJIT</h2>
 <p>
@@ -84,8 +95,8 @@ complete SDK.
 </p>
 <p>
 E.g. on a current Debian/Ubuntu, install <tt>libc6-dev</tt>
-with the package manager. Currently LuaJIT only builds as a 32&nbsp;bit
-application, so you actually need to install <tt>libc6-dev-i386</tt>
+with the package manager. Currently LuaJIT builds as a 32&nbsp;bit
+application by default, so you actually need to install <tt>libc6-dev-i386</tt>
 when building on an x64 OS.
 </p>
 <p>
@@ -106,6 +117,15 @@ which is probably the default on your system, anyway. Simply run:
 <pre class="code">
 make
 </pre>
+<div style="color: #00a000;">
+<p>
+You can force a build of the x64 interpreter on Linux/x64 with the
+following command:
+</p>
+<pre class="code">
+make CC="gcc -m64"
+</pre>
+</div>
 <p>
 By default modules are only searched under the prefix <tt>/usr/local</tt>.
 You can add an extra prefix to the search paths by appending the
@@ -122,7 +142,7 @@ in <tt>src/Makefile</tt>. Change it, if you want to build on an older version.
 <p>
 The top-level Makefile installs LuaJIT by default under
 <tt>/usr/local</tt>, i.e. the executable ends up in
-<tt>/usr/local/bin</tt> and so on. You need to have root privileges
+<tt>/usr/local/bin</tt> and so on. You need root privileges
 to write to this path. So, assuming sudo is installed on your system,
 run the following command and enter your sudo password:
 </p>
@@ -157,9 +177,15 @@ Either install one of the open source SDKs
 GCC plus the required development headers.
 </p>
 <p>
-Or install Microsoft's Visual C++ (MSVC) &mdash; the freely downloadable
+Or install Microsoft's Visual C++ (MSVC). The freely downloadable
 <a href="http://www.microsoft.com/Express/VC/"><span class="ext">&raquo;</span>&nbsp;Express Edition</a>
-works just fine.
+works just fine, but only contains an x86 compiler.
+</p>
+<p>
+The freely downloadable
+<a href="http://msdn.microsoft.com/en-us/windowsserver/bb980924.aspx"><span class="ext">&raquo;</span>&nbsp;Windows SDK</a>
+only comes with command line tools, but this is all you need to build LuaJIT.
+It contains x86 and x64 compilers.
 </p>
 <p>
 Next, download the source package and unpack it using an archive manager
@@ -177,6 +203,32 @@ msvcbuild
 <p>
 Then follow the installation instructions below.
 </p>
+<h3>Building with the Windows SDK</h3>
+<p>
+Open a "Windows SDK Command Shell" and select the x86 compiler:
+</p>
+<pre class="code">
+setenv /release /x86
+</pre>
+<div style="color: #00a000;">
+<p>
+Or select the x64 compiler (this only builds the interpreter right now):
+</p>
+<pre class="code">
+setenv /release /x64
+</pre>
+</div>
+<p>
+Then <tt>cd</tt> to the directory where you've unpacked the sources
+and run these commands:
+</p>
+<pre class="code">
+cd src
+msvcbuild
+</pre>
+<p>
+Then follow the installation instructions below.
+</p>
 <h3>Building with MinGW or Cygwin</h3>
 <p>
 Open a command prompt window and make sure the MinGW or Cygwin programs

doc/luajit.html

@@ -63,8 +63,10 @@ standard Lua interpreter and can be deployed as a drop-in replacement.
 <p>
 LuaJIT offers more performance, at the expense of portability. It
 currently runs on all popular operating systems based on <b>x86 CPUs</b>
-(Linux, Windows, OSX etc.). It will be ported to x64 CPUs and other
-platforms in the future, based on user demand and sponsoring.
+(Linux, Windows, OSX etc.). A port to x64 CPUs is currently ongoing &mdash;
+you can follow its progress in the <a href="http://luajit.org/download.html"><span class="ext">&raquo;</span>&nbsp;git repository</a>.
+Other platforms will be supported in the future, based on user demand
+and sponsoring.
 </p>
 
 <h2>Overview</h2>