From: Jeff Law <jeffreyalaw@gmail.com>
To: Eric Botcazou <botcazou@adacore.com>, Jakub Jelinek <jakub@redhat.com>
Cc: gcc-patches@gcc.gnu.org, Richard Biener <rguenther@suse.de>,
Richard Sandiford <richard.sandiford@arm.com>
Subject: Re: [PATCH] combine: Fix simplify_comparison AND handling for WORD_REGISTER_OPERATIONS targets [PR109040]
Date: Sat, 8 Apr 2023 18:25:32 -0600 [thread overview]
Message-ID: <8d3c3861-c291-e762-a2a8-0b520f39a7e3@gmail.com> (raw)
In-Reply-To: <3412470.QJadu78ljV@fomalhaut>
On 4/6/23 08:21, Eric Botcazou wrote:
>> So, perhaps just in the return op0; case add further code for
>> WORD_REGISTER_OPERATIONS and sub-word modes which will call nonzero_bits
>> again for the word mode and decide if it is still safe.
>
> Does it work to just replace mode by word_mode in the calls to nonzero_bits?
It helps marginally -- basically we defer mucking up the code a bit. We
then hit this in simplify_and_const_int_1:
/* See what bits may be nonzero in VAROP. Unlike the general case of
a call to nonzero_bits, here we don't care about bits outside
MODE. */
nonzero = nonzero_bits (varop, mode) & GET_MODE_MASK (mode);
That just seems wrong for WORD_REGISTER_OPERATIONS targets.
Hacking both locations in a similar manner fixes the test.
jeff
next prev parent reply other threads:[~2023-04-09 0:25 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-05 9:16 [PATCH] dse: Handle SUBREGs of word REGs differently " Jakub Jelinek
2023-04-05 13:14 ` Jeff Law
2023-04-05 14:51 ` Jakub Jelinek
2023-04-05 16:17 ` Jeff Law
2023-04-05 16:48 ` Jakub Jelinek
2023-04-05 17:31 ` Jeff Law
2023-04-06 9:31 ` Richard Sandiford
2023-04-06 9:37 ` Li, Pan2
2023-04-06 14:49 ` Jeff Law
2023-04-06 14:45 ` Jeff Law
2023-04-06 10:15 ` Eric Botcazou
2023-04-06 10:31 ` [PATCH] combine: Fix simplify_comparison AND handling " Jakub Jelinek
2023-04-06 10:51 ` Eric Botcazou
2023-04-06 11:37 ` Jakub Jelinek
2023-04-06 14:21 ` Eric Botcazou
2023-04-09 0:25 ` Jeff Law [this message]
2023-04-10 7:10 ` Jakub Jelinek
2023-04-12 1:26 ` Jeff Law
2023-04-12 6:21 ` Jakub Jelinek
2023-04-12 10:02 ` [PATCH] combine, v3: Fix " Jakub Jelinek
2023-04-12 14:17 ` Jeff Law
2023-04-12 14:30 ` Jakub Jelinek
2023-04-12 15:24 ` Segher Boessenkool
2023-04-12 16:58 ` [PATCH] combine, v4: " Jakub Jelinek
2023-04-13 4:05 ` Jeff Law
2023-04-13 10:57 ` Segher Boessenkool
2023-04-13 12:35 ` Jeff Law
2023-04-13 13:45 ` [PATCH] loop-iv: Fix up bounds computation Jakub Jelinek
2023-04-13 15:07 ` Jeff Law
2023-04-13 19:37 ` Jeff Law
2023-04-12 13:29 ` [PATCH] combine: Fix simplify_comparison AND handling for WORD_REGISTER_OPERATIONS targets [PR109040] Jeff Law
2023-04-09 1:15 ` Jeff Law
2023-04-10 5:13 ` Hongtao Liu
2023-04-10 5:15 ` Hongtao Liu
2023-04-06 14:35 ` Jeff Law
2023-04-06 15:06 ` Jeff Law
2023-04-06 14:53 ` [PATCH] dse: Handle SUBREGs of word REGs differently " Jeff Law
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