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Date: Wed, 2 Sep 2015 23:07:28 +0300
Message-ID: <CAA2C=vDeQYxWex2FMutFRr3aeMGZK3VUCUpiK=dGGNHHpDAfKw@mail.gmail.com>
Subject: Re: different binary output with 32- and 64-bit hosted compilers
From: "Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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On 9/2/15, Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com]
<djgpp AT delorie DOT com> wrote:
>> Date: Wed, 2 Sep 2015 14:53:59 -0400
>> From: DJ Delorie <dj AT delorie DOT com>
>>
>> > Could someone who feels more at home with assembly please take a look?
>> > DJ?
>>
>> The difference is in GAS itself, which chooses a longer form of the JE
>> opcode here (and no, I can't think of a good reason why):
>
> Perhaps this should be reported to the Binutils maintainers.
>
>> 32:    21d3:	0f 84 47 00 00 00    	je     2220 <_fire_grenade2+0x270>
>> 64:    21d3:	74 4b                	je     2220 <_fire_grenade2+0x270>
>>
>> There are no other root differences - every other difference is due to
>> addresses being different, and even that is limited as an alignment
>> shortly after that resynchromizes everything.
>
> Thanks.
>
> So I guess we can conclude that these differences can be disregarded,
> at least with a new enough version of GCC.  The fact there are
> differences is, of course, an annoyance, but it looks like we will
> have to live with that.
>

OK.  Many thanks to all.