<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jan 7, 2015, at 11:32 AM, Philip Reames <<a href="mailto:listmail@philipreames.com" class="">listmail@philipreames.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class="moz-cite-prefix">On 01/07/2015 11:28 AM, Pete Cooper
wrote:<br class="">
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<div class="">On Jan 7, 2015, at 11:18 AM, Philip Reames <<a moz-do-not-send="true" href="mailto:listmail@philipreames.com" class="">listmail@philipreames.com</a>>
wrote:</div>
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<div bgcolor="#FFFFFF" text="#000000" class=""> On the
review for <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://reviews.llvm.org/D6808">http://reviews.llvm.org/D6808</a>,
<a moz-do-not-send="true" href="http://reviews.llvm.org/p/majnemer/" class=" phui-link-person phui-handle
">majnemer</a> commented
that:<br class="">
<span class="transaction-comment" data-sigil="transaction-comment" data-meta="14_7">"Address
space 1 has a special meaning in LLVM, it's identical to
address space 0 except for the fact that "null" may be
dereferenced. You might want to consider a different
address space."<br class="">
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This is the first I've heard of this and I can't find
any documentation about it being reserved, either in
general, or specifically for x86. Can anyone clarify?<br class="">
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First i’ve heard of it...<br class="">
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<div bgcolor="#FFFFFF" text="#000000" class=""><span class="transaction-comment" data-sigil="transaction-comment" data-meta="14_7"> <br class="">
The only address spaces with special meanings I know of
are:<br class="">
- 0 (the normal address space, null is not
dereferencable)<br class="">
- 256 - TLS, GS relative addressing<br class="">
- 257 - FS relative addressing<br class="">
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I didn’t even know 256/257 had special meanings. I thought they
were only used by x86. It would be good to clarify them too
just incase other targets ever wanted to use them.</div>
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Sorry, let me clarify. To my knowledge, 256/257 are only reserved
on x86. <br class=""></div></div></blockquote>Ah cool. Thanks.</div><div><br class=""></div><div>Pete<br class=""><blockquote type="cite" class=""><div class=""><div bgcolor="#FFFFFF" text="#000000" class="">
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<div class="">Thanks,</div>
<div class="">Pete<br class="">
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<div bgcolor="#FFFFFF" text="#000000" class=""><span class="transaction-comment" data-sigil="transaction-comment" data-meta="14_7"> <br class="">
Philip<br class="">
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