Re: BUG #13498: make check failures

I'll agree to a point.

I'll see what else I can find out. Is there an option to make the test more
verbose ? And I'll see what I can get out of the what changes the
optimization does

Its a pitty, I'd love to get postgresql screaming on a P-series. In other
things level 3 can increase the performance 20-30% and level 5 in one
program that does a lot of array searching 50-70%



On Mon, Jul 13, 2015 at 1:13 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:

> pete@petelancashire.com writes:
> > make check
> > -O2 passes w/o errors
> > -O3 with or without -strict fails
>
> Presumably what is happening here (and also in your followon #13499)
> is that xlc with higher optimization levels generates bad code.  Whether
> this is a compiler bug, or is traceable to a valid deficiency in our code,
> is really impossible to tell for anyone without access to that compiler
> (and even with access, it might be a lot of work).  If you want to trace
> it down I'm afraid it's going to be pretty much your responsibility to do
> it.
>
>                         regards, tom lane
>
>