[llvm-commits] [llvm] r46500 - /llvm/trunk/docs/LangRef.html

[Chris Lattner]

Author: lattner
Date: Tue Jan 29 01:00:44 2008
New Revision: 46500

URL: http://llvm.org/viewvc/llvm-project?rev=46500&view=rev
Log:
llvm.sqrt(-0.0) is defined.

Modified:
    llvm/trunk/docs/LangRef.html

Modified: llvm/trunk/docs/LangRef.html
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/LangRef.html?rev=46500&r1=46499&r2=46500&view=diff

==============================================================================
--- llvm/trunk/docs/LangRef.html (original)
+++ llvm/trunk/docs/LangRef.html Tue Jan 29 01:00:44 2008
@@ -4677,7 +4677,9 @@
 The '<tt>llvm.sqrt</tt>' intrinsics return the sqrt of the specified operand,
 returning the same value as the libm '<tt>sqrt</tt>' functions would.  Unlike
 <tt>sqrt</tt> in libm, however, <tt>llvm.sqrt</tt> has undefined behavior for
-negative numbers (which allows for better optimization).
+negative numbers other than -0.0 (which allows for better optimization, because
+there is no need to worry about errno being set).  <tt>llvm.sqrt(-0.0)</tt> is
+defined to return -0.0 like IEEE sqrt.
 </p>
 
 <h5>Arguments:</h5>