On Wed, Jan 25, 2017 at 4:25 PM, Segher Boessenkool
<seg...@kernel.crashing.org> wrote:
> On Wed, Jan 25, 2017 at 04:08:54PM +0000, Bin.Cheng wrote:
>> > I was worried this patch would prevent too many other optimisations,
>> > so I looked into better options. I didn't find any. I tested the
>> > effects of the patch on 31 architectures (building GCC and then Linux
>> Thanks very much for this, that's a lot of testing work.
>
> The power of scripting ;-) Of course it doesn't help if you do not
> have enough free disk space, and other yak shaving, sigh.
>
> Analysing the differences is mostly manual of course. Luckily there
> weren't any. I also tested a few other changes at the same time; if
> I would have known this one was easy in the end... Oh well.
>
>> I will
>> revise the patch by explaining why is the change, as well as the
>> impact.
>
> Yes please. Make sure to mention the PR, it helps finding the mail
> threads and commits a lot.
Hi all,
Thanks very much for helping. I committed below change to trunk.
------------------------------------------------------------------------
r244979 | amker | 2017-01-27 14:42:23 +0000 (Fri, 27 Jan 2017) | 8 lines
PR rtl-optimization/78559
* combine.c (try_combine): Discard REG_EQUAL and REG_EQUIV for
other_insn in combine.
gcc/testsuite
PR rtl-optimization/78559
* gcc.c-torture/execute/pr78559.c: New test.
Thanks,
bin
>
>
> Segher
