https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70220
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |hjl.tools at gmail dot com --- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Wink Saville from comment #0) > I have identified one possible problem and with this scheme, what if the > compiler needs to setup a stack frame by pushing rbp and then moving rsp to > rbp, how would that case be handled. Why should be it a problem unless you don't want to restore RSP and RBP to its original values upon returning from ISR. Please provide an example here.