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Expand on adding an intrinsic. Move section to before adding an instruction

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12796 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2004-04-09 19:24:20 +00:00
parent 6d804f408a
commit 3636540635
1 changed files with 40 additions and 26 deletions
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66
docs/ExtendingLLVM.html
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@ -14,8 +14,8 @@
<ol>
<li><a href="#introduction">Introduction and Warning</a></li>
<li><a href="#instruction">Adding a new instruction</a></li>
<li><a href="#intrinsic">Adding a new intrinsic function</a></li>
<li><a href="#instruction">Adding a new instruction</a></li>
<li><a href="#type">Adding a new type</a>
<ol>
<li><a href="#fund_type">Adding a new fundamental type</a></li>
@ -69,6 +69,45 @@ href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM-dev</a>.</p>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="intrinsic">Adding a new intrinsic function</a>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>Adding a new intrinsic function to LLVM is much easier than adding a new
instruction. Almost all extensions to LLVM should start as an intrinsic
function and then be turned into an instruction if warranted.</p>
<ol>
<li><tt>llvm/docs/LangRef.html</tt>:
Document the intrinsic. Decide whether it is code generator specific and
what the restrictions are. Talk to other people about it so that you are
sure it's a good idea.</li>
<li><tt>llvm/include/llvm/Intrinsics.h</tt>:
add an enum in the <tt>llvm::Intrinsic</tt> namespace</li>
<li><tt>llvm/lib/VMCore/IntrinsicLowering.cpp</tt>:
implement the lowering for this intrinsic</li>
<li><tt>llvm/lib/VMCore/Verifier.cpp</tt>:
Add code to check the invariants of the intrinsic are respected.</li>
<li><tt>llvm/lib/VMCore/Function.cpp (<tt>Function::getIntrinsicID()</tt>)</tt>:
Identify the new intrinsic function, returning the enum for the intrinsic
that you added.</li>
<li>Test your intrinsic</li>
<li><tt>llvm/test/Regression/*</tt>: add your test cases to the test suite.</li>
</ol>
<p>If this intrinsic requires code generator support (ie, it cannot be lowered).
You should also add support to the code generator in question.</p>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="instruction">Adding a new instruction</a>
@ -116,31 +155,6 @@ to understand this new instruction.</p>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="intrinsic">Adding a new intrinsic function</a>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<ol>
<li><tt>llvm/include/llvm/Intrinsics.h</tt>:
add an enum in the <tt>llvm::Intrinsic</tt> namespace</li>
<li><tt>llvm/lib/VMCore/IntrinsicLowering.cpp</tt>:
implement the lowering for this intrinsic</li>
<li><tt>llvm/lib/VMCore/Verifier.cpp</tt>:
handle the new intrinsic</li>
<li><tt>llvm/lib/VMCore/Function.cpp</tt>:
handle the new intrinsic</li>
</ol>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">