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<p class=MsoNormal>I would like to use the LLVM x86 code generator to emit
Intel syntax that is compatible with Microsoft’s MASM 9.x. Taking the TOT
LLVM, from last week, I have found a number of changes that are required to
make this work, most of which are straight forward but a couple I wanted to
check with the group to see what people thought was the best thing to do. In
particular, I have made all necessary changes and these are mostly constrained
to the files:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> X86IntelAsmPrinter.[h|cpp]<o:p></o:p></p>
<p class=MsoNormal> X86TargetAsmInfo.[h|cpp]<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Making sure the syntax follows Microsoft MASM requirements. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The main problem that I have hit is regarding the use of CL
register in the shift instructions. The problem is that ATT syntax states that
it should be referenced as “%cl” while Intel says just “cl”
but these references occur in X86InstInfo.td and this means that it is shared
between Intel and ATT printing! For example, the shift rules:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>let Uses = [CL] in {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>def SHL8rCL : I<0xD2, MRM4r, (outs GR8
:$dst), (ins GR8 :$src),<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
"shl{b}\t{%cl, $dst|$dst, %CL}",<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
[(set GR8:$dst, (shl GR8:$src, %CL))]>;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>def SHL16rCL : I<0xD3, MRM4r, (outs GR16:$dst),
(ins GR16:$src),<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
"shl{w}\t{%cl, $dst|$dst, %CL}",<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
[(set GR16:$dst, (shl GR16:$src, %CL))]>, OpSize;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>def SHL32rCL : I<0xD3, MRM4r, (outs GR32:$dst),
(ins GR32:$src),<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
"shl{l}\t{%cl, $dst|$dst, %CL}",<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
[(set GR32:$dst, (shl GR32:$src, %CL))]>;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>}
// Uses = [CL]</span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Needs to be:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>let Uses = [CL] in {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>def SHL8rCL : I<0xD2, MRM4r, (outs GR8
:$dst), (ins GR8 :$src),<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
"shl{b}\t{%cl, $dst|$dst, CL}",<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
[(set GR8:$dst, (shl GR8:$src, CL))]>;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>def SHL16rCL : I<0xD3, MRM4r, (outs GR16:$dst),
(ins GR16:$src),<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
"shl{w}\t{%cl, $dst|$dst, CL}",<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
[(set GR16:$dst, (shl GR16:$src, CL))]>, OpSize;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>def SHL32rCL : I<0xD3, MRM4r, (outs GR32:$dst),
(ins GR32:$src),<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
"shl{l}\t{%cl, $dst|$dst, CL}",<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
[(set GR32:$dst, (shl GR32:$src, CL))]>;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>}
// Uses = [CL]</span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The problem is that it does not make sense to have separate rules
for Intel and ATT and as such I wanted to get the lists advice on what people
think is the best approach to resolving this issue so I can make the changes?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>It is also worth noting that MASM does not allow:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> shr
ESI<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>to be mean shift by 1 and instead I have to emit:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> shr
ESI, 1<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>which I’m assuming is not an issue?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Finally, as far as I can tell from comments on the mailing
list the current Intel syntax emitted by LLVM does not work with any particular
Window’s assembler and so making these changes will not cause another
path to stop working, is this correct?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Many thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Ben<o:p></o:p></p>
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