[clang] 95edd7f - Making the code compliant to the documentation about Floating Point

[Zahira Ammarguellat via cfe-commits]

Author: Zahira Ammarguellat
Date: 2021-11-15T15:30:10-05:00
New Revision: 95edd7f53e77415ca30abefdcdc5ce723c292ebd

URL: https://github.com/llvm/llvm-project/commit/95edd7f53e77415ca30abefdcdc5ce723c292ebd
DIFF: https://github.com/llvm/llvm-project/commit/95edd7f53e77415ca30abefdcdc5ce723c292ebd.diff

LOG: Making the code compliant to the documentation about Floating Point
support default values for C/C++. FPP-MODEL=PRECISE enables FFP-CONTRACT
(FMA is enabled).

Added: 
    

Modified: 
    clang/docs/ReleaseNotes.rst

Removed: 
    


################################################################################
diff  --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 00582b6898629..204ccdfa58e51 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -205,11 +205,16 @@ Arm and AArch64 Support in Clang
 
 Floating Point Support in Clang
 -------------------------------
-- The -ffp-model=precise now implies -ffp-contract=on rather than
-  -ffp-contract=fast, and the documentation of these features has been
-  clarified. Previously, the documentation claimed that -ffp-model=precise was
-  the default, but this was incorrect because the precise model implied
-  -ffp-contract=fast, whereas the default behavior is -ffp-contract=on.
+- The default setting of FP contraction (FMA) is now -ffp-contract=on (for
+  languages other than CUDA/HIP) even when optimization is off. Previously,
+  the default behavior was equivalent to -ffp-contract=off (-ffp-contract
+  was not set).
+  Related to this, the switch -ffp-model=precise now implies -ffp-contract=on
+  rather than -ffp-contract=fast, and the documentation of these features has
+  been clarified. Previously, the documentation claimed that -ffp-model=precise
+  was the default, but this was incorrect because the precise model implied
+  -ffp-contract=fast, wheras the (now corrected) default behavior is
+  -ffp-contract=on.
   -ffp-model=precise is now exactly the default mode of the compiler.
 
 Internal API Changes