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<p class=MsoNormal><font size=1 face="Times New Roman"><span style='font-size:
8.0pt'>On Oct 22, 2008, at 1:28 PM, <st1:PersonName w:st="on">Villmow, Micah</st1:PersonName>
wrote:<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=1 face="Times New Roman"><span style='font-size:
8.0pt'><br>
<br>
<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:black'>Is there a simple way to specify the
relationship between two different register classes of various sizes and
alignments as being legal to convert between them?</span></font><font size=1
color=black><span style='font-size:8.0pt;color:black'><o:p></o:p></span></font></p>
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</span></u1:smarttagtype></u1:smarttagtype></u1:smarttagtype></u1:smarttagtype>
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<p class=MsoNormal><font size=1 face="Times New Roman"><span style='font-size:
8.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'>I don't get it. What does it mean to "convert" between two
register classes? You can move between different register classes.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>I am somehow hitting patterns where a 64bit
load operation has as one of its arguments the result of a 32 bit comparison. I
have conversion functions that can convert between the 64bit and 32 bit and
back. So, if this situation is detected, can I specify for llvm to insert some
sort of conversion instead of just aborting with:<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'>Register class of operand and regclass of
use don't agree!<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'>Operand = 2<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'>Op->Val = 01828560: f64,ch =
PTRLOAD_f64 0182B7E0, 0182B4B0, 0182B868, 01828450<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=PL
style='font-size:10.0pt;font-family:Arial;color:navy'>MI = %reg1028<def>
= CMP_32 41, %reg1027<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=PL
style='font-size:10.0pt;font-family:Arial;color:navy'>VReg = 1027<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'>VReg RegClass size = 8, align = 8<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'>Expected RegClass size = 4, align = 4<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'>Fatal error, aborting.<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Both of these patterns are matched via
tablegen, so I’m not sure how it is coming to this conclusion. I never
ran into this problem when all of them were the same register class, I just ran
into other issues.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><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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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>I have my backend written up using a
single register class for i32, i64, f32 and f64 types, however, because the
type</span></font><font color=black><span style='color:black'><o:p></o:p></span></font></p>
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</span></u1:smarttagtype></u1:smarttagtype></u1:smarttagtype></u1:smarttagtype>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>You mean several types all map to the same register class? Why not
specify several classes instead?<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I have many instructions that work irrespective
of the data type. By allowing multiple types to work in a single register
class, this reduces the number of times I have to duplicate code. For, example,
I have a 128bit copy that works on i32, i64, f32, f64 data along with vector
types up to 128bits in length. Tablegen should be smart enough to figure out
that if my 128 bit register class has the 32bit and 64 bit register classes as
subclasses, then a pattern written for the 128bit register class should also
work for the sub types. This is standard object oriented programming. Throw all
the common code into a super class and put data type specific into sub classes.
If this is possible, how? If not, what is stopping tablegen from support this?<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for your time,<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Micah<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Evan<o:p></o:p></span></font></p>
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<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>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>information is not propagated down to the
machine instruction register level, it is not known to me how to determine
which data type my current register is. In working on moving to using 4
separate register classes I ran into the problem where some of my setup code
needs the larger type and not the smaller type.<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'> So is it possible to have the
register class I have setup for i32 type be automatically converted to the
generic register type instead of aborting?<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><u1:p> </u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Micah Villmow<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Systems Engineer<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Advanced Technology & Performance<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Advanced Micro Devices Inc.<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><ns0:street u2:insauthor="Micah Villmow" u2:insdate="2008-10-22T13:24:00Z" u2:endinsauthor="Micah Villmow" u2:endinsdate="2008-10-22T13:24:00Z"><ns0:address u2:insauthor="Micah Villmow" u2:insdate="2008-10-22T13:24:00Z" u2:endinsauthor="Micah Villmow" u2:endinsdate="2008-10-22T13:24:00Z"><st1:street u2:st="on"><st1:address u2:st="on"><st1:Street
w:st="on"><st1:address w:st="on"><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>4555 Great America Pkwy</st1:address></st1:street></ns0:address></ns0:street></span></font></st1:address></st1:Street><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>,<u1:p></u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><ns0:place u2:insauthor="Micah Villmow" u2:insdate="2008-10-22T13:24:00Z" u2:endinsauthor="Micah Villmow" u2:endinsdate="2008-10-22T13:24:00Z"><ns0:city u2:insauthor="Micah Villmow" u2:insdate="2008-10-22T13:24:00Z" u2:endinsauthor="Micah Villmow" u2:endinsdate="2008-10-22T13:24:00Z"><st1:city u2:st="on"><st1:place u2:st="on"><st1:City
w:st="on"><st1:place w:st="on"><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>Santa Clara</st1:place></st1:city></ns0:city></ns0:place></span></font></st1:place></st1:City><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>, CA. 95054<u1:p></u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>P: 408-572-6219<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>F: 408-572-6596</span></font><font
color=black><span style='color:black'><u1:p></u1:p><o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><u1:p> </u1:p><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>_______________________________________________<br>
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</u1:smarttagtype></u1:smarttagtype></u1:smarttagtype></u1:smarttagtype>
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