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

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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
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Eli Friedman 2018-07-17 20:28:31 +00:00
parent 5f96ea6159
commit 0e00c7e30d
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docs/LangRef.rst
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@ -9294,7 +9294,7 @@ otherwise unsafe floating-point optimizations.
Any set of fast-math flags are legal on an ``fcmp`` instruction, but the 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 only flags that have any effect on its semantics are those that allow
assumptions to be made about the values of input arguments; namely 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: Example:
"""""""" """"""""