Clarify some of the differences between indexing with getelementptr and indexing with insertvalue/extractvalue.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120957 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LangRef.html b/docs/LangRef.html
index 68d65f1..76fa06f 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -4131,6 +4131,14 @@
<a href="#t_array">array</a> type. The operands are constant indices to
specify which value to extract in a similar manner as indices in a
'<tt><a href="#i_getelementptr">getelementptr</a></tt>' instruction.</p>
+ <p>The major differences to <tt>getelementptr</tt> indexing are:</p>
+ <ul>
+ <li>Since the value being indexed is not a pointer, the first index is
+ omitted and assumed to be zero.</li>
+ <li>At least one index must be specified.</li>
+ <li>Not only struct indices but also array indices must be in
+ bounds.</li>
+ </ul>
<h5>Semantics:</h5>
<p>The result is the value at the position in the aggregate specified by the
@@ -4165,7 +4173,7 @@
<a href="#t_array">array</a> type. The second operand is a first-class
value to insert. The following operands are constant indices indicating
the position at which to insert the value in a similar manner as indices in a
- '<tt><a href="#i_getelementptr">getelementptr</a></tt>' instruction. The
+ '<tt><a href="#i_extractvalue">extractvalue</a></tt>' instruction. The
value to insert must have the same type as the value identified by the
indices.</p>