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Re: Suboptimal __restrict optimization?
On Tue, Oct 4, 2011 at 5:07 PM, Ulf Magnusson <ulfalizer@gmail.com> wrote:
> On Mon, Oct 3, 2011 at 10:22 PM, Ian Lance Taylor <iant@google.com> wrote:
>> Ulf Magnusson <ulfalizer@gmail.com> writes:
>>
>>> Is there some reason why GCC couldn't generate this code for the first
>>> version of C::f()? Is this a failure of optimization, or am I missing
>>> something in how __restricted works?
>>
>> It's a failure of optimization.
>>
>> Ian
>>
>
> Is this something that has been improved in 4.6.x? (Sorry for the
> initial non-reply-all.)
With 4.6 we export points-to info to RTL, so in theory it could, but
in reality combine does not work to fuse load, add and store.
Richard.