On Sep 26, 2024, at 11:47 AM, Alex Coplan <alex.cop...@arm.com> wrote:
>
> In r15-3585-g9759f6299d9633cabac540e5c893341c708093ac I added a test which
> started failing on PowerPC. The test checks that we unroll exactly one loop
> three times with the following:
>
> // { dg-final { scan-ltrans-rtl-dump-times "Unrolled loop 3 times" 1
> "loop2_unroll" } }
>
> which passes on most targets. However, on PowerPC, the loop in main
> gets unrolled too, causing the scan-ltrans-rtl-dump-times check to fail
> as the statement now appears twice in the dump. I think the extra
> unrolling is due to different unrolling heuristics in the rs6000 port.
>
> This patch therefore explicitly tries to block the unrolling in main with an
> appropriate #pragma.
>
> I've checked that the test now passes on power (on cfarm29) and aarch64. I
> also
> checked that reverting the lto-streamer-{in,out}.cc changes still causes the
> test to fail (on aarch64).
>
> OK for trunk?
Ok.
