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| -rw-r--r-- | llvm/docs/ReleaseNotes.rst | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst index cf00ae2ad56..06f3f1a9c19 100644 --- a/llvm/docs/ReleaseNotes.rst +++ b/llvm/docs/ReleaseNotes.rst @@ -62,9 +62,12 @@ Non-comprehensive list of changes in this release applied by default. * Optimization of floating-point casts is improved. This may cause surprising - results for code that is relying on undefined behavior. Code sanitizers can - be used to detect affected patterns. The option for detecting this problem - alone is "-fsanitize=float-cast-overflow": + results for code that is relying on the undefined behavior of overflowing + casts. The optimization can be disabled by specifying a function attribute: + "fp-cast-overflow-workaround"="true". This attribute may be created by the + clang option :option:`-ffp-cast-overflow-workaround`. + Code sanitizers can be used to detect affected patterns. The option for + detecting this problem alone is "-fsanitize=float-cast-overflow": .. code-block:: c |
