[avr-gcc-list] Clarification for interrupt specific changes in output_movhi() in revision 136238

[Boyapati, Anitha]

This is quite an old change date 2 years ago.
http://gcc.gnu.org/viewcvs?view=revision&revision=136238


Please check the diff done in avr.c file in revision 136238 w.r.t to its 
previous revision.
http://gcc.gnu.org/viewcvs/trunk/gcc/config/avr/avr.c?r1=135953&r2=136238&pathrev=136238


Interrupt specific code has been removed from output_movhi for instructions 
belonging to prologue and epilogue. Hence the relevant code from output_movhi() 
[3rd hunk] has been moved to expand_prologue() [1st hunk] and expand_epilogue() 
[2nd hunk]


There is one issue I would like to get clarified. In prologue, conditional 
check for is_OS_main is happening but not the same in epilogue.

expand_prologue() {
        ...
+             else if (TARGET_NO_INTERRUPTS 
+                      || cfun->machine->is_signal
+                      || cfun->machine->is_OS_main)
+               {
        ...

expand_epilogue() {
        ...
+             else if (TARGET_NO_INTERRUPTS 
+                      || cfun->machine->is_signal)
+               {
        ...

Any quick thoughts on why this is not done?


Thanks
Anitha