GCC4.0.0 - Query

[Sachin Vijay Sonawane]

Hi,
  I am currently working on GCC Instruction Scheduling pass. The previous 
versions of GCC, from GCC-3.3 onwards, had the provision to insert NOP-rtl 
appropriately during Instruction Scheduling pass(haifa.c : schedule_block).
This is required for machine-architectures which do not support
hardware-stall and requires compiler to insert NOP.
  However, GCC4.0.0 does not contain this code to insert NOP rtl.

  Is there any technical reason behind this? Can anyone please clarify 
about this matter?

-- 
Regards,
Sachin S.