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Add a note about the V9 backend.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13959 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner
2004-06-02 07:06:06 +00:00
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@ -130,6 +130,18 @@ implement radically different code generators in the LLVM system that do not
make use of any of the built-in components. Doing so is not recommended at all, make use of any of the built-in components. Doing so is not recommended at all,
but could be required for radically different targets that do not fit into the but could be required for radically different targets that do not fit into the
LLVM machine description model: programmable FPGAs for example.</p> LLVM machine description model: programmable FPGAs for example.</p>
<p><b>Important Note:</b> For historical reasons, the LLVM SparcV9 code
generator uses almost entirely different code paths than described in this
document. For this reason, there are some deprecated interfaces (such as
<tt>TargetRegInfo</tt> and <tt>TargetSchedInfo</tt>), which are only used by the
V9 backend and should not be used by any other targets. Also, all code in the
<tt>lib/Target/SparcV9</tt> directory and subdirectories should be considered
deprecated, and should not be used as the basis for future code generator work.
The SparcV9 backend is slowly being merged into the rest of the target
independent code generators, but this is a low-priority process with no
predictable completion date.</p>
</div> </div>
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