Float arguments are passed incorrectly from a ms_abi function to a sysv function, as can be witnessed by a simple testcase, which fails on all optimizations. I don't think this is a regression, as wine always failed on that testcase.
-- Summary: ms_abi -> sysv_abi passing float arguments incorrectly Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: m dot b dot lankhorst at gmail dot com GCC build triplet: x86_64-linux-gnu GCC host triplet: x86_64-linux-gnu GCC target triplet: x86_64-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43869