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