From: Jeff Law <jeffreyalaw@gmail.com>
To: gcc-patches@gcc.gnu.org
Subject: Re: [PATCH] regrename: Fix -fcompare-debug issue in check_new_reg_p [PR105041]
Date: Fri, 10 Jun 2022 14:09:44 -0600 [thread overview]
Message-ID: <0eb46b88-232e-01a9-5b40-a850c796d763@gmail.com> (raw)
In-Reply-To: <20220610154003.GR25951@gate.crashing.org>
On 6/10/2022 9:40 AM, Segher Boessenkool wrote:
> Hi!
>
> On Fri, Jun 10, 2022 at 07:52:57PM +0530, Surya Kumari Jangala wrote:
>> In check_new_reg_p, the nregs of a du chain is computed by obtaining the MODE
>> of the first element in the chain, and then calling hard_regno_nregs() with the
>> MODE. But the first element of the chain can be a DEBUG_INSN whose mode need
>> not be the same as the rest of the elements in the du chain. This
>> was resulting in fcompare-debug failure as check_new_reg_p was returning a
>> different result with -g for the same candidate register. We can instead obtain
>> nregs from the du chain itself.
> Great, thanks for finding and fixing this! I cannot approve it, you'll
> have to wait for someone who can. It looks fine to me, but that does
> not mean so much in regrename.c :-)
I'll go ahead and ACK the regrename bits. So as soon as you're happy
with the testsuite bits, this is good to go.
jeff
prev parent reply other threads:[~2022-06-10 20:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-10 14:22 Surya Kumari Jangala
2022-06-10 15:40 ` Segher Boessenkool
2022-06-10 20:09 ` Jeff Law [this message]
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