From: Uros Bizjak <ubizjak@gmail.com>
To: Eric Botcazou <ebotcazou@adacore.com>
Cc: "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH, sparc]: Use ROUND_UP and ROUND_DOWN macros
Date: Tue, 13 Oct 2015 10:30:00 -0000 [thread overview]
Message-ID: <CAFULd4Zvrh1Qd+_NyJqY2EUrqnKW2sW3titJ1Ghe1qjtdFB8zg@mail.gmail.com> (raw)
In-Reply-To: <2133098.QDH4UeQdFs@polaris>
On Tue, Oct 13, 2015 at 12:10 PM, Eric Botcazou <ebotcazou@adacore.com> wrote:
>> Two functional changes I'd like to point out:
>>
>> /* ALIGN FRAMES on double word boundaries */
>> -#define SPARC_STACK_ALIGN(LOC) \
>> - (TARGET_ARCH64 ? (((LOC)+15) & ~15) : (((LOC)+7) & ~7))
>> +#define SPARC_STACK_ALIGN(LOC) ROUND_UP ((LOC), UNITS_PER_WORD * 2)
>>
>> The one above uses UNITS_PER_WORD in stack alignment calculation
>
> OK.
>
>> /* Always preserve double-word alignment. */
>> - offset = (offset + 8) & -8;
>> + offset = ROUND_UP (offset, 8);
>>
>> The one above looks like off-by-one bug, but this needs a confirmation.
>
> No, it's correct, it's a bump of 8 followed by a ROUND_DOWN (the offset may or
> may not have been bumped by 4 already in the code just above).
In this case, I think it is better to write this part as:
--cut here--
offset += 8;
/* Always preserve double-word alignment. */
offset = ROUND_DOWN (offset, 8);
--cut here--
WDYT?
Uros.
next prev parent reply other threads:[~2015-10-13 10:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 17:01 Uros Bizjak
2015-10-13 10:11 ` Eric Botcazou
2015-10-13 10:30 ` Uros Bizjak [this message]
2015-10-13 10:41 ` Eric Botcazou
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