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authorDan Gohman <gohman@apple.com>2009-11-09 18:40:39 +0000
committerDan Gohman <gohman@apple.com>2009-11-09 18:40:39 +0000
commit938443807150a1259283412bf8b89bd4141f9111 (patch)
tree5fc1d6619e5bff7903bddc69d30ab434c0162cda /docs
parentf6572d0aa2abb87d34afcca3e3bec89e1613b8ec (diff)
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Remove the "special case" for zero-length arrays, and rephrase this
paragraph to be more precise. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86572 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
-rw-r--r--docs/LangRef.html13
1 files changed, 7 insertions, 6 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html
index eea1f03060..be2b93b5a0 100644
--- a/docs/LangRef.html
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@@ -1576,12 +1576,13 @@ Classifications</a> </div>
</tr>
</table>
-<p>Note that 'variable sized arrays' can be implemented in LLVM with a zero
- length array. Normally, accesses past the end of an array are undefined in
- LLVM (e.g. it is illegal to access the 5th element of a 3 element array). As
- a special case, however, zero length arrays are recognized to be variable
- length. This allows implementation of 'pascal style arrays' with the LLVM
- type "<tt>{ i32, [0 x float]}</tt>", for example.</p>
+<p>Except when the <tt>inbounds</tt> keyword is present, there is no limitation
+ on indexing beyond the end of the array implied by the static type (though
+ any loads or stores must of course be within the bounds of the allocated
+ object!). This means that single-dimension 'variable sized array' addressing
+ can be implemented in LLVM with a zero length array type. An implementation
+ of 'pascal style arrays' in LLVM could use the type
+ "<tt>{ i32, [0 x float]}</tt>", for example.</p>
<p>Note that the code generator does not yet support large aggregate types to be
used as function return types. The specific limit on how large an aggregate