[PATCH] [ARM] Post-indexed addressing for NEON memory access

[Charles Baylis]

On 18 June 2014 at 11:06, Ramana Radhakrishnan
<ramana.gcc@googlemail.com> wrote:
> On Tue, Jun 17, 2014 at 4:03 PM, Charles Baylis
> <charles.baylis@linaro.org> wrote:
>> Your mention of larger vector modes prompted me to check that the
>> patch has the desired result with them. In fact, the costs are
>> estimated incorrectly which means the post_modify pattern is not used.
>> The attached patch fixes that. (used in combination with my original
>> patch)
>>
>>
>> 2014-06-15  Charles Baylis  <charles.bayls@linaro.org>
>>
>>         * config/arm/arm.c (arm_new_rtx_costs): Reduce cost for mem with
>>         embedded side effects.
>
> I'm not too thrilled with putting in more special cases that are not
> table driven in there. Can you file a PR with some testcases that show
> this so that we don't forget and CC me on it please ?

I created https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61551 at the time.

I've come back to look at this again and would like to fix it in this
release cycle. I still don't really understand what you mean by
table-driven in this context. Do you still hold this view, and if so,
could you describe what you'd like to see instead of this patch?