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Add a note that specifies that the whether or not sign extension is done by 

a cast is determined by the source operand.

llvm-svn: 3304
This commit is contained in:
Chris Lattner 2002-08-13 20:52:09 +00:00
parent 42f596feda
commit 1330428256
1 changed files with 6 additions and 1 deletions
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7
llvm/docs/LangRef.html
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@ -1603,6 +1603,11 @@ When casting to bool, any value that would be considered true in the context of
a C '<tt>if</tt>' condition is converted to the boolean '<tt>true</tt>' values,
all else are '<tt>false</tt>'.<p>
When extending an integral value from a type of one signness to another (for
example '<tt>sbyte</tt>' to '<tt>ulong</tt>'), the value is sign-extended if the
<b>source</b> value is signed, and zero-extended if the source value is
unsigned.<p>
<h5>Example:</h5>
<pre>
%X = cast int 257 to ubyte <i>; yields ubyte:1</i>
@ -1736,7 +1741,7 @@ more...
<address><a href="mailto:sabre@nondot.org">Chris Lattner</a></address>
<!-- Created: Tue Jan 23 15:19:28 CST 2001 -->
<!-- hhmts start -->
Last modified: Tue Jun 25 15:19:34 CDT 2002
Last modified: Tue Aug 13 15:50:47 CDT 2002
<!-- hhmts end -->
</font>
</body></html>