document calling convention extensions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21753 91177308-0d34-0410-b5e6-96231b3b80d8
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+++ b/docs/BytecodeFormat.html
@@ -1059,7 +1059,11 @@
</tr>
<tr>
<td><a href="#bit">bit(0-3)</a></td>
- <td class="td_left">Reserved for future use. Currently set to 0001.</td>
+ <td class="td_left">
+ Encodes the calling convention number of the function. If this number is
+ zero, this field is followed by a vbr indicating the CC#. Otherwise, the
+ CC number of the function is the value of this field minus one.
+ </td>
</tr>
<tr>
<td><a href="#bit">bit(4)</a></td>