RE: [avr-gcc-list] code selection: ijmp and icall

[Weddington, Eric]

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Markus Oertel
> Sent: Monday, December 01, 2008 6:14 AM
> To: address@hidden
> Subject: [avr-gcc-list] code selection: ijmp and icall
> 
> Hello,
> 
> I'm trying to optimize an interpreter for avr code by previously 
> translating static basic blocks. Indirect jumps can make that effort 
> useless when the IJMP and ICALL command jump to targets that are not 
> labeled.
> 
> So my question is: does the compiler create jumptargets for IJMP and 
> ICALL that are not labeled. It seems pretty strange to me to 
> jump in the 
> middle of a block although it is possible in assembler.
> 
> Where can I find information about the code selection process of the 
> avr-gcc and the behaviour of the different optimization levels?

For that information you will have to look into GCC internals, and the AVR back 
end in GCC.