[PATCH PR71347][Partial revert r235513]Compute cost for all uses in group

[Richard Biener]

On Mon, Jun 13, 2016 at 11:57 AM, Bin Cheng <Bin.Cheng@arm.com> wrote:
> Hi,
> This patch partially reverts part of r235513 to fix PR71347, the original patch is to improve compilation time for a small amount.  Root cause as analyzed in bugzilla PR is that we can't skip computing cost for sub iv_use if it has different position to the first use in group.  The patch also includes a new test.
>
> Bootstrap and test on x86_64.  Is it OK?

Ok.

Richard.

> Thanks,
> bin
>
> 2016-05-31  Bin Cheng  <bin.cheng@arm.com>
>
>         PR tree-optimization/71347
>         * tree-ssa-loop-ivopts.c (determine_group_iv_cost_address): Compute
>         cost for all uses in group.
>
> gcc/testsuite/ChangeLog
> 2016-05-31  Bin Cheng  <bin.cheng@arm.com>
>
>         PR tree-optimization/71347
>         * gcc.dg/tree-ssa/pr71347.c: New test.