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<div class="moz-cite-prefix">On 10/30/16 5:33 PM, soroosh khoram via
llvm-dev wrote:<br>
</div>
<blockquote
cite="mid:CACxUfiQOhWpowdyzKrrH-xKy_BP7uxS8mphUycoGLJFZTVhVxQ@mail.gmail.com"
type="cite">
<div dir="ltr">Hi,
<div><br>
</div>
<div>As part of a project I need to compile C code for a new
architecture that is based on x86 with some new instructions.
In my C code I'm going to use inline assembly, so the only
thing I need from LLVM is to recognize the instruction and put
it in the binary in the right place with correct input
values/register addresses.</div>
</div>
</blockquote>
<br>
If you already have an assembler that recognizes your new
instruction, it may be easier to use the -no-integrated-as argument
on the clang command line and have it use the assembler that
supports the instruction.<br>
<br>
If there is no assembler that understands your new instructions,
then enhancing LLVM's code generator/internal assembler/internal
disassembler is probably a good way to go.<br>
<br>
Regards,<br>
<br>
John Criswell<br>
<blockquote
cite="mid:CACxUfiQOhWpowdyzKrrH-xKy_BP7uxS8mphUycoGLJFZTVhVxQ@mail.gmail.com"
type="cite">
<div dir="ltr">
<div><br>
</div>
<div>I tried to add a simple ADD instruction, following the
instructions in <a moz-do-not-send="true"
href="http://llvm.org/docs/ExtendingLLVM.html#adding-a-new-instruction">http://llvm.org/docs/ExtendingLLVM.html#adding-a-new-instruction</a>
and just duplicating everything I saw for the ADD instruction
for my instruction. The problem is that this page doesn't
explain where I should add the opcode for my instruction.</div>
<div><br>
</div>
<div>I've been reading the documents and the source code for
several days now and I feel kind of lost right now. I was
hoping someone here could point me to the right direction.</div>
<div><br>
</div>
<div>Thank you</div>
<div>Soroosh
</div>
</div>
<br>
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</blockquote>
<br>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
<a class="moz-txt-link-freetext" href="http://www.cs.rochester.edu/u/criswell">http://www.cs.rochester.edu/u/criswell</a></pre>
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