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Document the automatic alias printing of InstAliases.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130889 91177308-0d34-0410-b5e6-96231b3b80d8
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Bill Wendling 2011-05-04 23:40:14 +00:00
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docs/CodeGenerator.html
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@ -2019,6 +2019,11 @@ def : InstAlias<"fcomi $reg", (COM_FIr RST:$reg)>;
<p>Instruction aliases can also have a Requires clause to make them
subtarget specific.</p>
<p>If the back-end supports it, the instruction printer can automatically emit
the alias rather than what's being aliased. It typically leads to better,
more readable code. If it's better to print out what's being aliased, then
pass a '0' as the third parameter to the InstAlias definition.</p>
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