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<p class=MsoNormal><span style='color:#1F497D'>In the same breath I’d
also like to kindly ask if someone could have a look at the reverse operations,
namely trunk from 128 to 64 bit using movdq2q, and 128 to 32 and 64 to 32 using
movd. This also seems related to Bug 2585. Thanks again.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
llvmdev-bounces@cs.uiuc.edu [mailto:llvmdev-bounces@cs.uiuc.edu] <b>On Behalf
Of </b>Nicolas Capens<br>
<b>Sent:</b> Thursday, 31 July, 2008 16:03<br>
<b>To:</b> 'LLVM Developers Mailing List'<br>
<b>Subject:</b> [LLVMdev] Generating movq2dq using IRBuilder<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi all,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>How do I generate the movq2dq SSE2 instruction using the
IRBuilder? There is no zext from 64-bit to 128-bit (corresponding to MMX to XMM
register transfer) as far as I can tell. So I’ve tried inserting an i64
into a v2i64, which generates valid code but rather a number of stores and
loads on the stack instead of a single movq2dq.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Looking though the code, I found a pattern for the
instruction in X86GenDAGISEL.inc, but it describes a i64 to v2i64 bitcast
(which isn’t allowed by IRBuilder). Also, it is described as <span
style='font-size:10.0pt;font-family:"Courier New"'>MMX_MOVQ2DQrr</span> and
only checks for MMX support, while it’s really an SSE2 instruction.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Actually zext from 32 to 64 and 32 to 128 bit would also be
useful, using movd and movq instructions. I couldn’t find ways to generate
these instructions. I believe they should also be supported as intrinsics, so
if anyone could check whether or not that works, and if so, how I could do it
using the IRBuilder, that would be very much appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Cheers,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Nicolas Capens<o:p></o:p></p>
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