<p>The type of each index argument depends on the type it is indexing into.
When indexing into a (packed) structure, only <tt>i32</tt> integer
<b>constants</b> are allowed. When indexing into an array, pointer or vector,
-integers of any width are allowed (also non-constants). 16-bit
-values will be sign extended to 32-bits if required, and 32-bit values
-will be sign extended to 64-bits if required.</p>
+integers of any width are allowed (also non-constants).</p>
<p>For example, let's consider a C code fragment and how it gets
compiled to LLVM:</p>