http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49211
--- Comment #5 from Nils Asmussen <n...@script-solution.de> 2011-05-30 15:22:37 UTC --- > Again, I suggest you have a look at crtn.asm, in particular these lines: > > % This must be the last file on the link-line, allocating global registers > % from the top. > > % Register $254 is the stack-pointer. > sp GREG > > So, if you leave that out, the global-register-allocation machinery in the > linker will allocate registers starting from the topmost, which is $254 ($255 > being a scratch register). Oh, ok. I thought in a different direction :/ Then it's perfectly clear. Thanks!
