What happens when -O1 flag is used?

[ranjith kumar <ranjit_kumar_b4u@xxxxxxxxxxx>]

Hi,
   1)Are -O and -O1 flags  equal?
   2) What happens internally when -O1/-O flag is
used?
      I have been searching gcc internal manuals. But
I could not locate.
  Where can I find it.Any help please.

Thanks in advance.


		
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