http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48417
--- Comment #7 from Mikael Pettersson <mikpe at it dot uu.se> 2011-08-28 10:25:41 UTC --- I guess !global_regs[regno] vs !fixed_regs[regno] matters for compilation units that are compiled with -ffixed-$N but where there is no global register variable declaration for $N in scope. Can you construct a C test case which shows that gcc clobbers a register $N even though the file is compiled with -ffixed-$N ?
