how to dump ssa-pre debug info

Wed Nov 30 22:08:00 GMT 2011

> Trashbucket<>  writes:
>> I am trying to dump the debug info of gcc/tree-ssa-pre.c but did not
>> succeed. (using gcc 4.4.3)
>> I tried -ftree-pre with -fdump-tree-all or -fdump-tree-pre[-all] and
>> many more and searched for strings that should have been in one of the
>> generated files.
> It should work to use -fdump-tree-pre-details -O2.  You need the -O2 to
> ensure that the optimization is enabled--merely adding the -fdump option
> won't enable the option, and neither will merely adding -ftree-pre.
> Ian
Thank you, now it works.
I thought -ftree-pre would enable the optimization. Also I used -o 
instead of -O (no comment on that).

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