https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78459
--- Comment #7 from Jeffrey A. Law <law at redhat dot com> --- So I've got a patch for the h8 instance of this problem. I'll have to see if I can reproduce the various SH instances and backtest my patch against them. The situation we were running into was generic code was creating something like (set (temp) (plus (stack_pointer_rtx) (const))) (set (stack_pointer_rtx) (temp) REG_ARGS_SIZE note) CSE's back propagation would backprop stack_pointer_rtx for temp in the first insn, the second insn is dead and gets removed. The result is we lost the REG_ARGS_SIZE note. The obvious solution is to move the note during the back propagation. My tester has run that through a newlib build on the h8.
