[Bug target/85683] [8 Regression] GCC 8 stopped using RMW (Read Modify Write) instructions on x86[_64]

jakub at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Tue May 8 16:22:00 GMT 2018


Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
            Summary|[8/9 Regression] GCC 8      |[8 Regression] GCC 8
                   |stopped using RMW (Read     |stopped using RMW (Read
                   |Modify Write) instructions  |Modify Write) instructions
                   |on x86[_64]                 |on x86[_64]

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for GCC9 so far, will backport to 8.2 after a while.

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