the form %c0, as in asm ( "movl $42, %c0(%1)" : : "i"(offsetof(...)), "r"(...) : "memory" );
is not documented. -- Summary: inline asm %c0 template form not documented Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: trivial Priority: P3 Component: inline-asm AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: avi at argo dot co dot il GCC build triplet: N/A GCC host triplet: N/A GCC target triplet: N/A http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29357