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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi all,<br>
the patch is on Phabricator (http://reviews.llvm.org/D6149). With the help of new method readInstruction16() two bytes are read and decodeInstruction() is called with DecoderTableMicroMips16, if this fails another two bytes are read and
<font size="2"><span style="font-size:13.59px;">decodeInstruction</span></font><font size="2"><span style="font-size:13.59px;">() is called with </span></font><font size="2"><span style="font-size:13.59px;">DecoderTableMicroMips32</span></font>.<br>
<br>
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<div>Regards,<br>
Jozef<br>
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<div style="direction: ltr;" id="divRpF229726"><font color="#000000" face="Tahoma" size="2"><b>From:</b> Jun Koi [junkoi2004@gmail.com]<br>
<b>Sent:</b> Tuesday, November 04, 2014 3:18 AM<br>
<b>To:</b> Zoran Jovanovic<br>
<b>Cc:</b> Daniel Sanders; Vladimir Medic; Sasa Stankovic; Jozef Kolek; llvmdev@cs.uiuc.edu<br>
<b>Subject:</b> Re: Mips's MicroMips ??<br>
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<div class="gmail_quote">On Mon, Nov 3, 2014 at 10:44 PM, Zoran Jovanovic <span dir="ltr">
<<a href="mailto:Zoran.Jovanovic@imgtec.com" target="_blank">Zoran.Jovanovic@imgtec.com</a>></span> wrote:<br>
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<div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">Hello Daniel,
<div>At the moment we are preparing the patch for disassembling microMIPS 16 bit instructions and it will be on Phabricator tomorrow or on Wednesday.</div>
<div>Functionality is implemented in MipsDisassembler::getInstruction where first two bytes are read and decodeInstruction is called with DecoderTableMicroMips16 and only if it fails we read 4 bytes and call <span style="font-size:13.6000003814697px">decodeInstruction</span><span style="font-size:13.6000003814697px">
with </span><span style="font-size:13.6000003814697px">DecoderTableMicroMips32.</span></div>
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<div>awesome! looking forward to it.<br>
<br>
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<div>thanks,<br>
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<div>Jun<br>
<br>
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<div style="direction:ltr"><font color="#000000" face="Tahoma"><b>From:</b> Daniel Sanders<br>
<b>Sent:</b> Sunday, November 02, 2014 5:49 PM<br>
<b>To:</b> Jun Koi; Vladimir Medic; Sasa Stankovic; Jozef Kolek; Zoran Jovanovic<br>
<b>Cc:</b> <a href="mailto:llvmdev@cs.uiuc.edu" target="_blank">llvmdev@cs.uiuc.edu</a><br>
<b>Subject:</b> RE: Mips's MicroMips ??<br>
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<div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">Hi,<br>
<br>
I've had a quick look through MipsDisassembler.cpp and it seems that the disassembler doesn't know anything about 16-bit instructions at the moment. The two main problems are that DecoderTableMicroMips16 (which contains ADDU16_MM) is never used, and the disassembler
always reads the opcode as a 4-byte value.<br>
<br>
Vladimir/Sasa/Jozef/Zoran: I don't know much about the microMIPS encodings at the moment. Do you have the details on distinguishing 16-bit from 32-bit instructions?<br>
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<div style="direction:ltr"><font color="#000000" face="Tahoma"><b>From:</b> Jun Koi [<a href="mailto:junkoi2004@gmail.com" target="_blank">junkoi2004@gmail.com</a>]<br>
<b>Sent:</b> 29 October 2014 14:46<br>
<b>To:</b> Daniel Sanders<br>
<b>Cc:</b> <a href="mailto:llvmdev@cs.uiuc.edu" target="_blank">llvmdev@cs.uiuc.edu</a><br>
<b>Subject:</b> Mips's MicroMips ??<br>
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<div>Hi,<br>
<br>
</div>
We have this line in micromips-16-bit-instructions.s<br>
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# CHECK-EB: addu16 $6, $17, $4 # encoding: [0x07,0x42]<br>
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<div>However, when I check this with llvm-mc, like below, I dont get back the assembly.<br>
This is against the latest LLVM code. What is wrong here?<br>
<br>
Thanks,<br>
Jun<br>
<br>
<br>
$ echo "0x07,0x42"|./Release+Asserts/bin/llvm-mc -disassemble -triple=mips -show-encoding -mattr=micromips<br>
.text<br>
<stdin>:1:1: warning: invalid instruction encoding<br>
0x07,0x42<br>
^<br>
<stdin>:1:6: warning: invalid instruction encoding<br>
0x07,0x42<br>
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