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What approach should I take?</p>
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One way is to custom parse your operands-- take a look at AsmOperandClass and the related machinery in</div>
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include/llvm/Target/Target.td.<br>
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Is there any example of such a case in any Target?</div>
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A number of targets need similar sorts of handling, but AArch64 seems to be the closest example to your case.</div>
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In particular, the Neon vector register handling might be a good place to start. E.g., the VectorReg64AsmOperand+V64</div>
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definitions in AArchRegisterInfo.td (and users) and the corresponding parse code in AArch64AsmParser::tryParseNeonVectorRegister.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> llvm-dev <llvm-dev-bounces@lists.llvm.org> on behalf of Przemyslaw Ossowski via llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Sent:</b> Thursday, February 11, 2021 11:30 AM<br>
<b>To:</b> llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Subject:</b> [llvm-dev] LLVM AsmMatcher / AsmParser question - register number with dot modifier</font>
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<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
Hi,<span></span></p>
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<span> </span></p>
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I am trying to implement support for asm matching for instruction which uses three registers (operands).<span></span></p>
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And sometimes the register could have a suffix like .M.<span></span></p>
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<span> </span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
For example:<span></span></p>
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add x1, x2, x3<span></span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
and sometimes:<span></span></p>
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add x1.M, x.2, x.3<span></span></p>
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<span> <br>
</span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
For the second case I’ve defined instruction as follows:<span></span></p>
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<span> </span>(outs REGCLASS:$x1),<span></span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
<span> </span>(ins REGCLASS:$x2, REGCLASS:$x3),<span></span></p>
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“add\t\t${x1}.M, ${x2}, ${x3}"<span></span></p>
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<span> </span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
But AsmParser doesn’t recognize the case with .M returning "invalid operand for instruction".<span></span></p>
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<span> </span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
Should I define .M as separate operand for example:<span></span></p>
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(outs REGCLASS:$x1),<span></span></p>
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(ins REGCLASS:$x2, REGCLASS:$x3, REGMOD:$MOD)<span></span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
“add\t\t${x1}.${MOD}, ${x2}, ${x3}"<span></span></p>
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<span> </span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
But in such case it still doesn’t recognize “x1.M”, because as I understand it separates operands just with “,” (comma).<span></span></p>
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<span> </span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
What approach should I take?<span></span></p>
<p class="x_MsoNormal" style="margin:0in; font-size:11pt; font-family:"Calibri",sans-serif">
Is there any example of such a case in any Target?<span></span></p>
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<span> </span></p>
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Thanks,<span></span></p>
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Przemek<span></span></p>
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