From: Cary Coutant <ccoutant@gmail.com>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: Cary Coutant via Binutils <binutils@sourceware.org>,
Vladislav Khmelevsky <och95@yandex.ru>
Subject: Re: [PATCH] gold/aarch64: Fix adrp distance check
Date: Fri, 29 Jul 2022 15:14:25 -0700 [thread overview]
Message-ID: <CAJimCsE=EYscn5hGT43=VGk=6GFWm=STqCXvbj-iggcQQMpJNQ@mail.gmail.com> (raw)
In-Reply-To: <87a68r8x9l.fsf@igel.home>
> > The cast is unnecessary here for assignment to an int64_t. Once the
> > result is in a signed int, I don't think you need to go to all that
> > extra trouble to shift it.
>
> Note that right shifting a negative value is fully defined only in C++20
> and later.
Yes, you're right, thanks. I was tempted to say that every compiler we
care about does that as an arithmetic shift, but of course that's
careless. Then I saw that the arm-gcc compiler translates that ?:
idiom into a single "asr" instruction. Kinda suggests we should have
an ASR macro somewhere common.
Still, the static cast is unnecessary, and I see no need to introduce
the temporary "offset" instead of "adrp_imm".
-cary
next prev parent reply other threads:[~2022-07-29 22:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-25 17:52 Vladislav Khmelevsky
2022-07-29 20:14 ` Cary Coutant
2022-07-29 20:44 ` Andreas Schwab
2022-07-29 22:14 ` Cary Coutant [this message]
2022-08-08 19:18 ` Vladislav Khmelevsky
2022-11-07 11:28 Vladislav Khmelevsky
2022-11-11 0:49 ` Cary Coutant
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