On Thu, May 30, 2013 at 2:07 AM, Vini Kanvar <v...@cse.iitb.ac.in> wrote: > > gcc-4.7.2 adds exception handling constructs (try/finally block) for > pointer and array variables. These variables are CLOBBERed in the > finally block.
I'm not sure what you mean by this. An example might help. > What is the meaning and use of CLOBBER? In which cases is it required? > What will happen if gcc does not CLOBBER these variables (e.g. > gcc-4.6.2 does not add try/finally and CLOBBER in the gimple code. How > does gcc-4.6.2 deal with such variables?). In RTL CLOBBER simply means that the value is unimportant and meaningless. If a CLOBBER is omitted it means that GCC will 1) preserve the value in the register; 2) assume that the value in the register has been preserved. Ian
