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Diffstat (limited to 'docs/LangRef.html')
| -rw-r--r-- | docs/LangRef.html | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html index c06a88ba802b..a417db011541 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -1215,6 +1215,13 @@ target datalayout = "<i>layout specification</i>" <dt><tt>s<i>size</i>:<i>abi</i>:<i>pref</i></tt></dt> <dd>This specifies the alignment for a stack object of a given bit <i>size</i>.</dd> + + <dt><tt>n<i>size1</i>:<i>size2</i>:<i>size3</i>...</tt></dt> + <dd>This specifies a set of native integer widths for the target CPU + in bits. For example, it might contain "n32" for 32-bit PowerPC, + "n32:64" for PowerPC 64, or "n8:16:32:64" for X86-64. Elements of + this set are considered to support most general arithmetic + operations efficiently.</dd> </dl> <p>When constructing the data layout for a given target, LLVM starts with a @@ -1569,12 +1576,12 @@ 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>There is no restriction on indexing beyond the end of the array implied by + a static type (though there are restrictions on indexing beyond the bounds + of an allocated object in some cases). 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 @@ -7278,7 +7285,7 @@ LLVM</a>.</p> <a href="mailto:sabre@nondot.org">Chris Lattner</a><br> <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br> - Last modified: $Date: 2009-11-02 01:25:26 +0100 (Mon, 02 Nov 2009) $ + Last modified: $Date: 2009-11-09 20:01:53 +0100 (Mon, 09 Nov 2009) $ </address> </body> |