optimizing gcc output for ARM

[law@redhat.com]

  In message < 200011221759.RAA14019@cam-mail2.cambridge.arm.com >you write:
  > gives me (gcc -O2):
  > 
  > bar:
  >         mul     r1, r0, r1
  >         mov     r3, #9
  > .L13:
  >         subs    r3, r3, #1
  >         bpl     .L13
  >         add     r0, r1, r1, asl #2
  >         mov     r0, r0, asl #1
  >         mov     pc, lr
FWIW, the loop itself is completely useless too since the result of the
entire loop is sum += (coeff * sample * 10)

We actually realize that the loop computes above expression, but don't
actually remove the useless loop.

jeff


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