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Re: Which optimization levels affect gimple?
"Paulo J. Matos" <pocm@soton.ac.uk> writes:
> Which optimization levels affect gimple?
> I've tried for a program to check what kind of gimple code you get
> with -fdump-tree-gimple and -O0 and -O3 have different results,
> however, -O3 and -O9 have exactly the same output. Will -Ox for x > 3,
> generate the same gimple trees? (i.e., are done in backend of gcc?)
At present, as far as I know, the highest defined optimization level
is -O3. -ONUMBER where NUMBER > 3 is equivalent to -O3. There is no
particular guarantee that will remain true in the future, although
there are also no current plans to change it.
Ian