[LangRef] Clarify which fast-math flags affect fcmp.

nsz has no effect due to the way fcmp is defined; +0 and -0 compare
equal anyway. reassoc could have the obvious effect.

llvm-svn: 337322

diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 9c10bbb..1f4641c 100644 (file)
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -9294,7 +9294,7 @@ otherwise unsafe floating-point optimizations.
 Any set of fast-math flags are legal on an ``fcmp`` instruction, but the
 only flags that have any effect on its semantics are those that allow
 assumptions to be made about the values of input arguments; namely
-``nnan``, ``ninf``, and ``nsz``. See :ref:`fastmath` for more information.
+``nnan``, ``ninf``, and ``reassoc``. See :ref:`fastmath` for more information.
 
 Example:
 """"""""