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<div class=Section1>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>52740 indeed fixes it. Thank you!</span></font><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
llvmdev-bounces@cs.uiuc.edu [mailto:llvmdev-bounces@cs.uiuc.edu] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Evan Cheng<br>
<b><span style='font-weight:bold'>Sent:</span></b> Saturday, 12 July, 2008 4:28<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">LLVM
Developers Mailing List</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [LLVMdev] Shuffle
regression</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I have fixed a related bug: 52740. Can you check if that fixes this
problem?<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Evan<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Jul 11, 2008, at 6:43 PM, Nicolas Capens wrote:<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br>
<o:p></o:p></span></font></p>
<span style='orphans: 2;text-align:auto;widows: 2;-webkit-border-horizontal-spacing: 0px;
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<div link=blue vlink=purple>
<div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'>Hi all,<o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<div><u1:p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</u1:p></div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'>I think I found a regression in the
shuffle instruction. I’ve attached a replacement of fibonacci.cpp to reproduce
the issue. It runs fine on release 2.3 but revision 52648 fails, and I suspect
that the issue is still present.<o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<div><u1:p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</u1:p></div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'>2.3 generates the following x86 code:<o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<div><u1:p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</u1:p></div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10010
push ebp <u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10011
mov ebp,esp<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10013
and esp,0FFFFFFF0h<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10019
movups xmm0,xmmword ptr ds:[141D280h]<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10020
xorps xmm1,xmm1<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10023
movaps xmm2,xmm0<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10026
shufps xmm2,xmm1,32h<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A1002A
movaps xmm1,xmm0<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A1002D
shufps xmm1,xmm2,84h<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10031
shufps xmm0,xmm1,23h<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10035
shufps xmm1,xmm1,40h<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10039
shufps xmm1,xmm0,2Eh<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A1003D
movups xmmword ptr ds:[14262C0h],xmm1<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10044
mov esp,ebp<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10046
pop ebp <u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03A10047
ret </span></font><font size=2 color=black face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:black'><o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<div><u1:p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</u1:p></div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'>While 52648 generates this:<o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<div><u1:p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</u1:p></div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60010
push ebp <u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60011
mov ebp,esp<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60013
and esp,0FFFFFFF0h<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60019
movups xmm0,xmmword ptr ds:[148E280h]<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60020
xorps xmm1,xmm1<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60023
movaps xmm2,xmm0<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60026
shufps xmm2,xmm1,32h<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C6002A
movaps xmm1,xmm0<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C6002D
shufps xmm1,xmm2,84h<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60031
shufps xmm1,xmm1,40h<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60035
psrldq xmm0,0Ch<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C6003A
shufps xmm1,xmm0,2Eh<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C6003E
movups xmmword ptr ds:[148E280h],xmm1<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60045
mov esp,ebp<u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60047
pop ebp <u1:p></u1:p></span></font><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=gray face="Courier New"><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'>03C60048
ret </span></font><font size=2 color=black face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:black'><o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<div><u1:p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</u1:p></div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'>As I’m not using any optimization passes
in this one I suspect that the issue is somewhere in instruction selection.
Note the questionable use of the psrldq instruction.<o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<div><u1:p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</u1:p></div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'>If anyone could have a look at this that
would be great. I’ll try to narrow down the change that caused this regression…<o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<div><u1:p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</u1:p></div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'>Cheers,<o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<div><u1:p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</u1:p></div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:black'>Nicolas Capens<o:p></o:p></span></font></p>
<u1:p></u1:p></div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'><fibonacci.cpp><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>_______________________________________________<br>
LLVM Developers mailing list<br>
<a href="mailto:LLVMdev@cs.uiuc.edu">LLVMdev@cs.uiuc.edu</a>
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href="http://llvm.cs.uiuc.edu">http://llvm.cs.uiuc.edu</a><br>
<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev</a><o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'></span><o:p> </o:p></span></font></p>
</div>
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