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Update the -tailcallopt description to match djg's improvements to the calling

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convention. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93167 91177308-0d34-0410-b5e6-96231b3b80d8
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Jeffrey Yasskin 2010-01-11 18:53:47 +00:00
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@ -1731,11 +1731,6 @@ define fastcc i32 @tailcaller(i32 %in1, i32 %in2) {
(because one or more of above constraints are not met) to be followed by a (because one or more of above constraints are not met) to be followed by a
readjustment of the stack. So performance might be worse in such cases.</p> readjustment of the stack. So performance might be worse in such cases.</p>
<p>On x86 and x86-64 one register is reserved for indirect tail calls (e.g via a
function pointer). So there is one less register for integer argument
passing. For x86 this means 2 registers (if <tt>inreg</tt> parameter
attribute is used) and for x86-64 this means 5 register are used.</p>
</div> </div>
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<div class="doc_subsection"> <div class="doc_subsection">