On 04/18/2014 11:31 PM, Richard Henderson wrote: > On 04/17/2014 10:14 AM, DJ Delorie wrote: >> _medium_frame: >> pushm r6-r12 >> add #-4, r0, r6 ; marked frame-related (fp = sp - 4) >> mov.L r6, r0 ; marked frame-related (sp = fp) > > There's your bug. If the frame pointer is required, you shouldn't mark that > third insn as frame related. > > With this sequence, the auto-guessing code is assuming that r6 is just a > computational temporary and that sp is still the cfa.
This auto-guessing mistake is why I strongly recommend not using it if possible. Better to use explicit REG_CFA_DEF_CFA (et al) notes. Certainly one *must* use the explicit notes for the epilogue. r~
