6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-14 11:32:34 +00:00
Code Issues Projects Releases Wiki Activity

some minor edits, link to Passes.html, make one point

Browse Source 
I forgot about yesterday.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43350 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-10-25 17:52:39 +00:00
parent 89a354d7fa
commit 7271423a99
1 changed files with 25 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
docs/tutorial/LangImpl4.html
View File

@ -252,8 +252,9 @@ entry:
add from the program.</p> add from the program.</p>
<p>LLVM provides a wide variety of optimizations that can be used in certain <p>LLVM provides a wide variety of optimizations that can be used in certain
circumstances. Unfortunately we don't have a good centralized description of circumstances. Some <a href="../Passes.html">documentation about the various
what every pass does, but you can check out the ones that <tt>llvm-gcc</tt> or passes</a> is available, but it isn't very complete. Another good source of
ideas is to look at the passes that <tt>llvm-gcc</tt> or
<tt>llvm-ld</tt> run to get started. The "<tt>opt</tt>" tool allows you to <tt>llvm-ld</tt> run to get started. The "<tt>opt</tt>" tool allows you to
experiment with passes from the command line, so you can see if they do experiment with passes from the command line, so you can see if they do
anything.</p> anything.</p>
@ -410,6 +411,7 @@ declare double @cos(double)
ready&gt; <b>sin(1.0);</b> ready&gt; <b>sin(1.0);</b>
<em>Evaluated to 0.841471</em> <em>Evaluated to 0.841471</em>
ready&gt; <b>def foo(x) sin(x)*sin(x) + cos(x)*cos(x);</b> ready&gt; <b>def foo(x) sin(x)*sin(x) + cos(x)*cos(x);</b>
Read function definition: Read function definition:
define double @foo(double %x) { define double @foo(double %x) {
@ -444,6 +446,27 @@ tables, for example), allows you to dynamically decide on the fly based on the
function name, and even allows you to have the JIT abort itself if any lazy function name, and even allows you to have the JIT abort itself if any lazy
compilation is attempted.</p> compilation is attempted.</p>
<p>One interesting application of this is that we can now extend the language
by writing arbitrary C++ code to implement operations. For example, if we add:
</p>
<div class="doc_code">
<pre>
/// putchard - putchar that takes a double and returns 0.
extern "C"
double putchard(double X) {
putchar((char)X);
return 0;
}
</pre>
</div>
<p>Now we can produce simple output to the console by using things like:
"<tt>extern putchard(x); putchard(120);</tt>", which prints a lowercase 'x' on
the console (120 is the ascii code for 'x'). Similar code could be used to
implement file I/O, console input, and many other capabilities in
Kaleidoscope.</p>
<p>This completes the JIT and optimizer chapter of the Kaleidoscope tutorial. At <p>This completes the JIT and optimizer chapter of the Kaleidoscope tutorial. At
this point, we can compile a non-Turing-complete programming language, optimize this point, we can compile a non-Turing-complete programming language, optimize
and JIT compile it in a user-driven way. Next up we'll look into <a and JIT compile it in a user-driven way. Next up we'll look into <a