One more thing I forgot to mention is that, I am working on a rather old version of gcc - 2.95.2 for some reasons.
Krishna. On Sat, 28 May 2005, Ian Lance Taylor wrote: #N V Krishna <[EMAIL PROTECTED]> writes: # #> I am trying to do some modifications to the register allocator and for the #> architecture I am dealing with, I want to handle different type of pseudos #> differently. All local scalars fall under one group, local struct/union #> variables under one group and all globals under one group. Given a pseudo, #> I want to know which group it is being used with. # #It's hard to make sense of a strict distinction between local scalars #and local struct/union variables in gcc 4. The SRA optimization means #that struct/union variables will sometimes be handled as a collection #of independent scalar values. See tree-sra.c. # #> For some pseudos reg_equiv_memory_loc is returning NULL. And those are the #> cases that are causing me to thing otherwise. # #This will happen for a local variable which has not been spilled onto #the stack, and is thus always held in registers (this could be either #a scalar variable or a struct/union variable). It will also happen #for pseudos which hold sufficiently simple constant values--see the #reg_equiv_constant array. # #Ian #
