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From: Jeff Law <jeffreyalaw@gmail.com>
To: "Li, Pan2" <pan2.li@intel.com>, Robin Dapp <rdapp.gcc@gmail.com>,
	"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Cc: "juzhe.zhong@rivai.ai" <juzhe.zhong@rivai.ai>,
	"kito.cheng@gmail.com" <kito.cheng@gmail.com>,
	"richard.guenther@gmail.com" <richard.guenther@gmail.com>,
	"Wang, Yanzhang" <yanzhang.wang@intel.com>,
	"Liu, Hongtao" <hongtao.liu@intel.com>
Subject: Re: [PATCH v2] DSE: Bugfix ICE after allow vector type in get_stored_val
Date: Mon, 29 Apr 2024 09:20:29 -0600	[thread overview]
Message-ID: <335b7f03-9513-42f2-a1ab-53a15d3145ee@gmail.com> (raw)
In-Reply-To: <MW5PR11MB5908382E8639118DEF5E4080A9302@MW5PR11MB5908.namprd11.prod.outlook.com>



On 3/22/24 11:45 PM, Li, Pan2 wrote:
> Thanks Jeff for comments.
> 
>> As Richi noted using validate_subreg here isn't great.  Does it work to
>> factor out this code from extract_low_bits
>>
>>>    if (!int_mode_for_mode (src_mode).exists (&src_int_mode)
>>>        || !int_mode_for_mode (mode).exists (&int_mode))
>>>      return NULL_RTX;
>>>
>>>    if (!targetm.modes_tieable_p (src_int_mode, src_mode))
>>>      return NULL_RTX;
>>>    if (!targetm.modes_tieable_p (int_mode, mode))
>>>      return NULL_RTX;
> 
>> And use that in the condition (and in extract_low_bits rather than
>> duplicating the code)?
> 
> It can solve the ICE but will forbid all vector modes goes gen_lowpart.
> Actually only the vector mode size is less than reg nature size will trigger the ICE.
> Thus, how about just add one more condition before goes to gen_lowpart as below?
> 
> Feel free to correct me if any misunderstandings. 😉!
> 
> diff --git a/gcc/dse.cc b/gcc/dse.cc
> index edc7a1dfecf..258d2ccc299 100644
> --- a/gcc/dse.cc
> +++ b/gcc/dse.cc
> @@ -1946,7 +1946,9 @@ get_stored_val (store_info *store_info, machine_mode read_mode,
>                                   copy_rtx (store_info->const_rhs));
>     else if (VECTOR_MODE_P (read_mode) && VECTOR_MODE_P (store_mode)
>       && known_le (GET_MODE_BITSIZE (read_mode), GET_MODE_BITSIZE (store_mode))
> -    && targetm.modes_tieable_p (read_mode, store_mode))
> +    && targetm.modes_tieable_p (read_mode, store_mode)
> +    /* It's invalid in validate_subreg if read_mode size is < reg natural.  */
> +    && known_ge (GET_MODE_SIZE (read_mode), REGMODE_NATURAL_SIZE (read_mode)))
>       read_reg = gen_lowpart (read_mode, copy_rtx (store_info->rhs));
>     else
>       read_reg = extract_low_bits (read_mode, store_mode,
So how about this.  I'll ack this for the trunk, but not for gcc-14 (at 
this time).  We can revisit for gcc-14 after it's been on the trunk a 
bit.  Realistically that likely means gcc-14.2 at the end of the summer 
rather than gcc-14.1 which is due in roughly a week.

Jeff

  parent reply	other threads:[~2024-04-29 15:20 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-26  3:25 [PATCH v1] RTL: Bugfix ICE after allow vector type in DSE pan2.li
2024-02-26  3:41 ` Hongtao Liu
2024-02-26  3:42   ` Li, Pan2
2024-02-26  5:13     ` Hongtao Liu
2024-02-26  7:38 ` Richard Biener
2024-02-26  7:41   ` Li, Pan2
2024-02-26 14:22 ` [PATCH v2] DSE: Bugfix ICE after allow vector type in get_stored_val pan2.li
2024-02-27  9:47   ` Richard Biener
2024-02-27 15:02   ` Jeff Law
2024-02-28  1:40     ` Li, Pan2
2024-02-28  4:51       ` Li, Pan2
2024-02-28 17:33         ` Jeff Law
2024-02-29  1:38           ` Li, Pan2
2024-02-29 13:28             ` Robin Dapp
2024-03-02  1:04               ` Li, Pan2
2024-03-03 22:46               ` Jeff Law
2024-03-05  6:22                 ` Li, Pan2
2024-03-12  2:08                   ` Li, Pan2
2024-03-22  1:15                     ` Li, Pan2
2024-03-22 18:53                   ` Jeff Law
2024-03-23  5:45                     ` Li, Pan2
2024-04-06 12:02                       ` Li, Pan2
2024-04-18  1:46                         ` Li, Pan2
2024-04-28 12:10                           ` Li, Pan2
2024-04-29 15:20                       ` Jeff Law [this message]
2024-04-30  1:02                         ` Li, Pan2
2024-04-30  7:17 ` [PATCH v3] DSE: Fix " pan2.li
2024-04-30 11:35   ` Li, Pan2
2024-05-03  1:57     ` Li, Pan2
2024-05-03  1:51 ` [PATCH v4] " pan2.li
2024-05-16  4:06   ` Li, Pan2
2024-05-19 16:23   ` Jeff Law
2024-05-20  1:08     ` Li, Pan2

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