GCC4.3.4 downside against GCC3.4.4 on mips?

[Amker.Cheng]

Hi all,
  I compared assembly files of a function compiled by GCC4.3.4 and GCC3.4.4.
The function focuses on array computation and has no branch, or any
loop structure,
The command line is like "-march=mips32r2 -O3", and here is the
instruction statics:

            total    : 1879 : 1534
             addiu  :    6   :    6
             addu  :  216  :  129
              jr       :    1   :    1
             lui      :    5    :    5
              lw     :  396  :  353
            madd  :   41   :    0
            mfhi    :   80   :   80
            mflo    :  121  :   86
            move  :    0    :   21
            mtlo   :   39   :    0
             mul   :   85   :    0
            mult   :   18   :   80
           multu  :   64   :    0
              or    :   80   :   80
             sll     :   80  :   80
             sra   :   79   :   47
             srl    :   80   :   80
            subu  :   80   :   80
              sw   :  408  :  406

Considering there is no any branch or loop structure ,It seems result
of GCC3.4.4
is much better, since generating much less instructions.

secondly, GCC4.3.4 does consume less stack slots(1224 bytes against 1408).

So, any comments? Thanks in advance.
-- 
Best Regards.