aaron.ballman added inline comments.
================
Comment at: clang/docs/LanguageExtensions.rst:4698
``-ffast-math`` is disabled and ``-ffp-contract=on``
-(fused multiply add) is enabled.
+(fused multiply add) is enabled. This pragam enables ``-fmath-errno``.
+
----------------
================
Comment at: clang/docs/LanguageExtensions.rst:4702
+optimizations are enabled in the section of code governed by the pragma.
+Effectively ``-ffast-math`` is enabled and ``-ffp-contract=fast``. This pragam
+disables ``-fmath-errno``.
----------------
================
Comment at: clang/docs/UsersManual.rst:1727
- * ``precise`` Disables optimizations that are not value-safe on
floating-point data, although FP contraction (FMA) is enabled
(``-ffp-contract=on``). This is the default behavior.
+ * ``precise`` Disables optimizations that are not value-safe on
floating-point data, although FP contraction (FMA) is enabled
(``-ffp-contract=on``). This is the default behavior. This value resets
``-fmath-errno`` to its target-dependent default.
* ``strict`` Enables ``-frounding-math`` and
``-ffp-exception-behavior=strict``, and disables contractions (FMA). All of
the ``-ffast-math`` enablements are disabled. Enables ``STDC FENV_ACCESS``: by
default ``FENV_ACCESS`` is disabled. This option setting behaves as though
``#pragma STDC FENV_ACCESS ON`` appeared at the top of the source file.
----------------
Can you re-flow this to 80 columns?
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D151834/new/
https://reviews.llvm.org/D151834
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