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Date: Thu, 5 Feb 2009 16:20:31 +0800
Message-ID: <255079590902050020y6aae262cw69843f1ed3a6093b@mail.gmail.com>
Subject: Re: discussion for H5022
From: xiaoming gu <xiaoming.gu@gmail.com>
To: dev@harmony.apache.org
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I did some tests on 64-bit Windows and found sizeof(POINTER_SIZE_INT)=8. So
I think no truncation happens. And I could NOT find the code mentioned in
[1] and maybe it is because of some rollback. What's your opinion?

Xiaoming

[1] - https://issues.apache.org/jira/browse/HARMONY-5022

On Mon, Nov 3, 2008 at 2:00 PM, xiaoming gu <xiaoming.gu@gmail.com> wrote:

> So in 64-bit platform with compressed pointer, the base address for heap is
> still 64-bit but the offset is 32-bit.
>
> Got it. Thanks. -Xiaoming
>
>
> On Mon, Nov 3, 2008 at 12:21 PM, Xiao-Feng Li <xiaofeng.li@gmail.com>wrote:
>
>> Xiaoming, I think this work is only related with X86-64, the 64bit
>> machine. In a 32bit platform, there is no such concept of 64-bit base
>> address. In 64-bit platform with compressed pointer, we have a base
>> address and a 32-bit offset for one pointer.
>>
>> Thanks,
>> xiaofeng
>>
>> On Mon, Nov 3, 2008 at 11:52 AM, xiaoming gu <xiaoming.gu@gmail.com>
>> wrote:
>> > Hi, guys. I'm studying H5022 - incorrect codegeneration of compressed
>> obj
>> > arithmetics[1]. In my understanding, the problem is that current JIT
>> casts
>> > heap base address from 64-bit to 32-bit compulsorily in IA32 but that
>> > address must be in 64-bit even in a 32-bit platform. If I catch the
>> point of
>> > this jira correctly, I'll try to delete the casts in
>> > Ia32InstCodeSelector.cpp recently. Any comment? Thanks.
>> >
>> > Xiaoming
>> >
>> > [1] - https://issues.apache.org/jira/browse/HARMONY-5022
>> >
>>
>>
>>
>> --
>> http://xiao-feng.blogspot.com
>>
>
>


-- 
China Runtime Technologies Lab,
SSG/SSD/MRTC, Intel

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