================
@@ -1681,19 +1681,25 @@ for more details.
permitted to produce more precise results than performing the same
operations separately.
- The C standard permits intermediate floating-point results within an
+ The C/C++ standard permits intermediate floating-point results within an
expression to be computed with more precision than their type would
normally allow. This permits operation fusing, and Clang takes advantage
- of this by default. This behavior can be controlled with the ``FP_CONTRACT``
- and ``clang fp contract`` pragmas. Please refer to the pragma documentation
- for a description of how the pragmas interact with this option.
+ of this by default (``on``). Fusion across statements is non-C/C++ standard
+ compliant behavior and can be enabled (``fast``).
+
+ Fusion can be controlled with the ``FP_CONTRACT`` and ``clang fp contract``
+ pragmas. Please refer to the pragma documentation for a description of how
+ the pragmas interact with this option.
Valid values are:
- * ``fast`` (fuse across statements disregarding pragmas, default for CUDA)
- * ``on`` (fuse in the same statement unless dictated by pragmas, default
for languages other than CUDA/HIP)
- * ``off`` (never fuse)
- * ``fast-honor-pragmas`` (fuse across statements unless dictated by
pragmas, default for HIP)
+ * ``fast``: enable non-C/C++ standard compliant behavior and fusion across
+ statements disregarding pragmas (default for CUDA)
----------------
sjoerdmeijer wrote:
Done.
I did notice you're using "expressions", but I've kept "statements".
https://github.com/llvm/llvm-project/pull/127621
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