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In-Reply-To: <alpine.LSU.2.20.1505121559480.4883@wotan.suse.de>
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Date: Tue, 12 May 2015 14:49:00 -0000
Message-ID: <CAMe9rOpmOBJoRNy8QGQn03eQJrzsUk+MTzJJuQu_DD1kxXV5pg@mail.gmail.com>
Subject: Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
From: "H.J. Lu" <hjl.tools@gmail.com>
To: Michael Matz <matz@suse.de>
Cc: Jan Beulich <JBeulich@suse.com>, Binutils <binutils@sourceware.org>
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On Tue, May 12, 2015 at 7:31 AM, Michael Matz <matz@suse.de> wrote:
> Hi,
>
> On Tue, 12 May 2015, H.J. Lu wrote:
>
>> > This is with 2.23, so your patch would cause a regression:
>>
>> 1. This happened before 20140923.
>
> Same with current 2.25-branch.
>
>> 2. Can you speculate what
>>
>> " jmpw   4"
>>
>> does?
>
> It should do a jump to $nextip+offset, of course, just like a 32bit
> jump.  The disassembly is correct, because with a zero offset, that's
> indeed '4'.
>

I thought it did jump to "(nextip + offset) & 0xffff" on AMD.  Can you
verify if it is true?


-- 
H.J.