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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Micah.Villmow@amd.com href="mailto:Micah.Villmow@amd.com">Villmow,
Micah</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=llvmdev@cs.uiuc.edu
href="mailto:llvmdev@cs.uiuc.edu">LLVM Developers Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, February 06, 2009 5:47
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [LLVMdev] 16 bit floats</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I need to support 16 bit floats
for some operations, outside of datatypes.td and the constants class, is there
anything else I will need to modify to add f16
support?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT> </P></DIV></BLOCKQUOTE>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p>probably also code
generation (can't give specifics, no real expert on the LLVM
codebase).</o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p>this would be because, even if
the core typesystem knows of the type, the codegen might not know how to emit
operations on that type.</o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p>now, of
note:</o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p>in my project (not LLVM based),
float16 had not been supported directly (since it is not known to the CPU),
rather, some loader and saver thunks were used which converted to/from float32
(this used as the 'internal' representation of the type). in most cases, I would
think this would be faster than directly operating on the float16, since the CPU
supports float32, but float16 would have to be emulated.</o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p>(unless of course newer CPUs
are adding native float16 support or similar?...).</o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT> </P>
<BLOCKQUOTE
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<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Micah
Villmow<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Systems
Engineer<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Advanced Technology &
Performance<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Advanced Micro Devices
Inc.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><ns0:Street
w:endInsDate="2009-02-05T11:47:00Z" w:endInsAuthor="Micah Villmow"
w:insDate="2009-02-05T11:47:00Z" w:insAuthor="Micah Villmow"><ns0:address
w:endInsDate="2009-02-05T11:47:00Z" w:endInsAuthor="Micah Villmow"
w:insDate="2009-02-05T11:47:00Z" w:insAuthor="Micah Villmow">S1-609 One AMD
Place</ns0:address></ns0:Street></SPAN></FONT><o:p></o:p></P>
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style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><ns0:place
w:endInsDate="2009-02-05T11:47:00Z" w:endInsAuthor="Micah Villmow"
w:insDate="2009-02-05T11:47:00Z" w:insAuthor="Micah Villmow"><ns0:City
w:endInsDate="2009-02-05T11:47:00Z" w:endInsAuthor="Micah Villmow"
w:insDate="2009-02-05T11:47:00Z" w:insAuthor="Micah Villmow"><st1:City
w:st="on"><st1:place
w:st="on">Sunnyvale</st1:place></st1:City></ns0:City></ns0:place>, CA.
94085</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">P:
408-749-3966</SPAN></FONT><o:p></o:p></P>
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