Hi,
On Fri, 18 Nov 2016, Bin.Cheng wrote:
> On Wed, Nov 16, 2016 at 3:05 PM, Andreas Schwab wrote:
> > On Nov 14 2016, Michael Matz wrote:
> >
> >> PR missed-optimization/77881
> >> * combine.c (simplify_comparison): Remove useless subregs
> >> also inside the loop, not just a
On Wed, Nov 16, 2016 at 3:05 PM, Andreas Schwab wrote:
> On Nov 14 2016, Michael Matz wrote:
>
>> PR missed-optimization/77881
>> * combine.c (simplify_comparison): Remove useless subregs
>> also inside the loop, not just after it.
>> (make_compound_operation): Recognize s
On Nov 14 2016, Michael Matz wrote:
> PR missed-optimization/77881
> * combine.c (simplify_comparison): Remove useless subregs
> also inside the loop, not just after it.
> (make_compound_operation): Recognize some subregs as being
> masking as well.
This breaks gcc.
On Mon, Nov 14, 2016 at 05:56:49AM +0100, Michael Matz wrote:
> With this patch there are now no regressions on x86-64-linux (bootstrapped
> with all languages+ada). Okay for trunk?
I build cross-compilers for this for a whole bunch of archs, and built
Linux with that, to see what effect this ha
Hi,
On Sat, 12 Nov 2016, Segher Boessenkool wrote:
> Hi Michael,
>
> On Thu, Oct 20, 2016 at 04:20:09PM +0200, Michael Matz wrote:
> > PR missed-optimization/77881
> > * combine.c (simplify_comparison): Remove useless subregs
> > also inside the loop, not just after it.
> >
> > test
Hi Michael,
On Thu, Oct 20, 2016 at 04:20:09PM +0200, Michael Matz wrote:
> PR missed-optimization/77881
> * combine.c (simplify_comparison): Remove useless subregs
> also inside the loop, not just after it.
>
> testsuite/
> * gcc.target/i386/pr77881.c: New test.
This isn
On 10/20/2016 08:20 AM, Michael Matz wrote:
Hello,
like analyzed in the PR, combine is able to remove outer subregs that
don't do anything interesting in the context they are used
(simplify_comparison). But that currently happens outside of the loop
that retries simplifications if changes occur
