removing ctr branches from rs6000

[Spundun]

Hi as I am trying to use rs6000 configuration as a template to port gcc
to a new architecture, I am encountering problems. My latest is that
unlike rs6000 my arch doesnt have ctr register and the macros like 
HAVE_decrement_and_branch_on_count should be false. But I couldnt locate
a place in the sourcecode where they are defined ( I basically tried to
grep through the source). Can anyone suggest a clean way of removing
these "barnch on count" support? 
Thanx for all your help. 
Spundun