From: Chris Lattner <sabre@nondot.org>
Date: Tue, 29 Jan 2008 07:00:44 +0000 (+0000)
Subject: llvm.sqrt(-0.0) is defined.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=103e2d760f3fb81d426319389106a8aeb21a584d;p=oota-llvm.git

llvm.sqrt(-0.0) is defined.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46500 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/docs/LangRef.html b/docs/LangRef.html
index a2ee339bc0b..90ba0cc058f 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -4677,7 +4677,9 @@ types however.
 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>