[PATCH] PR target/70155: Use SSE for TImode load/store
Jeff Law
law@redhat.com
Tue Apr 26 15:08:00 GMT 2016
On 04/26/2016 03:17 AM, Richard Biener wrote:
> On Mon, 25 Apr 2016, Uros Bizjak wrote:
>
>> On Mon, Apr 25, 2016 at 4:47 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
>>> On Mon, Apr 25, 2016 at 7:18 AM, Uros Bizjak <ubizjak@gmail.com> wrote:
>>>> On Mon, Apr 25, 2016 at 2:51 PM, H.J. Lu <hongjiu.lu@intel.com> wrote:
>>>>> Tested on Linux/x86-64. OK for trunk?
>>>>
>>>>> + /* FIXME: Since the CSE pass may change dominance info, which isn't
>>>>> + expected by the fwprop pass, call free_dominance_info to
>>>>> + invalidate dominance info. Otherwise, the fwprop pass may crash
>>>>> + when dominance info is changed. */
>>>>> + if (TARGET_64BIT)
>>>>> + free_dominance_info (CDI_DOMINATORS);
>>>>> +
>>>>
>>>> Please resolve the above problem first, target-dependent sources are
>>>> not the place to apply band-aids for middle-end problems. The thread
>>>> with the proposed fix died in [1].
>>>>
>>>> [1] https://gcc.gnu.org/ml/gcc/2016-03/msg00143.html
>>>
>>> free_dominance_info (CDI_DOMINATORS) has been called in other
>>> places to avoid this middle-end issue. I don't know when the middle-end
>>> will be fixed. I don't think this target optimization should be penalized by
>>> the middle-end issue.
>>
>> Let's ask Richard if he is OK with the workaround...
>
> Well, it's ultimately your call (it's a workaround in the target).
>
> Of course I'd like to see the underlying issue fixed and the
> workarounds in "other places" be removed.
Agreed. It's fundamentally papering over a problem elsewhere.
jeff
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