<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"><base href="x-msg://2080/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Oct 4, 2012, at 1:14 PM, "Villmow, Micah" <<a href="mailto:Micah.Villmow@amd.com">Micah.Villmow@amd.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div lang="EN-US" link="blue" vlink="purple" style="font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="WordSection1" style="page: WordSection1; "><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; ">There needs to be a way to differentiate between an integer and a sampler by only looking at the type. The sampler itself is an opaque type in OpenCL. The only requirement is that it is initialized with a 32bit unsigned integer, not that the type itself is an integer.<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "> </span></div></div></div></blockquote><div><br></div><div>I understand that the spec doesn't require it to be a 32 bit integer, but if you are only ever assigning it a 32 bit integer, it doesn't make any sense to have the extra inttoptr instruction. </div><div><br></div><div>Secondly, your idea of differentiating an integer and sampler by type alone is then based upon the name of the type that you are pointing to and not actually the type itself. Anything based upon names can be risky. There was a point in time where the linker was not properly merging structures that were identical and therefore renaming them. It makes much more sense to attach metadata to samplers and images to denote what is what.</div><div><br></div><div>The image types being pointers I am fine with as there isn't any other way to do those.</div><div><br></div><div>-Tanya</div><div><br></div><br><blockquote type="cite"><div lang="EN-US" link="blue" vlink="purple" style="font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="WordSection1" style="page: WordSection1; "><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; ">Micah<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "> </span></div><div style="border-style: none none none solid; border-left-width: 1.5pt; border-left-color: blue; padding: 0in 0in 0in 4pt; "><div><div style="border-style: solid none none; border-top-width: 1pt; border-top-color: rgb(181, 196, 223); padding: 3pt 0in 0in; "><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "><span class="Apple-converted-space"> </span>Tanya Lattner [mailto:lattner@<a href="http://apple.com" style="color: purple; text-decoration: underline; ">apple.com</a>]<span class="Apple-converted-space"> </span><br><b>Sent:</b><span class="Apple-converted-space"> </span>Thursday, October 04, 2012 11:49 AM<br><b>To:</b><span class="Apple-converted-space"> </span>Benyei, Guy<br><b>Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:cfe-dev@cs.uiuc.edu" style="color: purple; text-decoration: underline; ">cfe-dev@cs.uiuc.edu</a>; Villmow, Micah;<span class="Apple-converted-space"> </span><a href="mailto:Anton.Lokhmotov@arm.com" style="color: purple; text-decoration: underline; ">Anton.Lokhmotov@arm.com</a><br><b>Subject:</b><span class="Apple-converted-space"> </span>Re: [cfe-dev] OpenCL & SPIR specific types - proposal and patch<o:p></o:p></span></div></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">I'm hoping to have comments on this patch tomorrow, but since I have proposed several patches to Clang for the sampler type (and have another in revision).. can you explain why you want to change the type from an integer to a pointer? <o:p></o:p></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">-Tanya<o:p></o:p></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div><div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">On Oct 3, 2012, at 8:06 AM, "Benyei, Guy" <<a href="mailto:guy.benyei@intel.com" style="color: purple; text-decoration: underline; ">guy.benyei@intel.com</a>> wrote:<o:p></o:p></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><br><br><o:p></o:p></div><div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; ">I’d like to renew the discussion about making the OpenCL specific types first class citizens in Clang.<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "> <o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; ">I think this change is required by the OpenCL specifications, since these type names are keywords of the OpenCL C language.<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; ">This change is also needed in order to enable efficient checking of OpenCL restrictions on these types (OpenCL 1.2 spec, section 6.9).<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; ">Furthermore, the proposed change will turn these types to pointers to opaque types, which means that it will hide the actual (vendor specific) implementation, so the OpenCL vendors using Clang will be able to implement these types in their own way.<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "> <o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; ">This change would also be a basis for the implementation of SPIR generation by Clang. The SPIR discussion and spec can be found here:<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "><a href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2012-September/024132.html" style="color: purple; text-decoration: underline; "><span style="color: purple; ">http://lists.cs.uiuc.edu/pipermail/cfe-dev/2012-September/024132.html</span></a><o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "><a href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2012-September/024178.html" style="color: purple; text-decoration: underline; "><span style="color: purple; ">http://lists.cs.uiuc.edu/pipermail/cfe-dev/2012-September/024178.html</span></a><o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "> <o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; ">Earlier discussion about the OpenCL types was started by Anton Lokhmotov:<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "><a href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-May/015297.html" style="color: purple; text-decoration: underline; "><span style="color: purple; ">http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-May/015297.html</span></a><o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "><a href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-April/014741.html" style="color: purple; text-decoration: underline; "><span style="color: purple; ">http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-April/014741.html</span></a><o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "><a href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-March/014118.html" style="color: purple; text-decoration: underline; "><span style="color: purple; ">http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-March/014118.html</span></a><o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "><a href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-March/014121.html" style="color: purple; text-decoration: underline; "><span style="color: purple; ">http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-March/014121.html</span></a><o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "> <o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "> <o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "><image001.png><o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "> <o:p></o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 13.5pt; font-family: Helvetica, sans-serif; "><opencl_types.patch><o:p></o:p></span></div><p style="margin-right: 0in; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 13.5pt; font-family: Helvetica, sans-serif; ">---------------------------------------------------------------------<br>Intel Israel (74) Limited<o:p></o:p></span></p><p style="margin-right: 0in; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 13.5pt; font-family: Helvetica, sans-serif; ">This e-mail and any attachments may contain confidential material for<br>the sole use of the intended recipient(s). Any review or distribution<br>by others is strictly prohibited. If you are not the intended<br>recipient, please contact the sender and delete all copies.<o:p></o:p></span></p><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 13.5pt; font-family: Helvetica, sans-serif; ">_______________________________________________<br>cfe-dev mailing list<br><a href="mailto:cfe-dev@cs.uiuc.edu" style="color: purple; text-decoration: underline; "><span style="color: purple; ">cfe-dev@cs.uiuc.edu</span></a><br><a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev" style="color: purple; text-decoration: underline; "><span style="color: purple; ">http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev</span></a><o:p></o:p></span></div></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div></div></div></blockquote></div><br></body></html>