From 13c5de777947ef9fdae9aebfba78ece9fc861577 Mon Sep 17 00:00:00 2001 From: Sanjay Patel Date: Fri, 27 Apr 2018 16:33:35 +0000 Subject: [PATCH] [docs] add fp-cast-overflow-workaround options to release notes llvm-svn: 331059 --- docs/ReleaseNotes.rst | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst index cf00ae2ad56..06f3f1a9c19 100644 --- a/docs/ReleaseNotes.rst +++ b/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