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>
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