VIRTUAL_STACK_VARS_REGNUM vs VIRTUAL_STACK_DYNAMIC_REGNUM

Hello, Can anyone familiar with backend explain to me when we use VIRTUAL_STACK_VARS_REGNUM (or) VIRTUAL_STACK_DYNAMIC_REGNUM in gcc? Rather, when does the compiler decide to allocate a variable to stack_vars region and when to stack_dynamic? I encountered some trouble with virtual-stack-vars

IRA improvement patch

Hi Vlad, I found a problem with your IRA improvement checkin r171649 on 29-3-2011. I can't get picochip port to build with this change. The problem is in the function "clarify_prohibited_class_mode_regs" in ira.c:1413. The code reproduced here is /* Clarify IRA_PROHIBITED_CLASS_MODE_REGS by e

reload question

Hello all, I was making some modifications to picochip port and ran into a problem with cse within reload and I think it is a bug. Can someone familiar with reload let me know if it is indeed a bug. The c testcase that caused the problem was gcc-4.6.0/gcc/testsuite/./gcc.c-torture/execute/9912