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I have a somewhat similar scenario in a downstream back-end. You might try #2 and then call one of:<br>
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/// Set this block to reflect that it potentially is the target of an indirect branch.
<div> void setHasAddressTaken() { AddressTaken = true; }</div>
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<div> /// Test whether this block must have its label emitted.</div>
<div> bool hasLabelMustBeEmitted() const { return LabelMustBeEmitted; }</div>
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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 Diogo Sampaio via llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Sent:</b> Tuesday, December 1, 2020 6:06 PM<br>
<b>To:</b> llvm-dev@lists.llvm.org <llvm-dev@lists.llvm.org><br>
<b>Subject:</b> [llvm-dev] Using a MachineInstruction Address</font>
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<div>Hi,<br>
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<div>Is there a straight-forward way to obtain an arbitrary MachineInstruction address and maintain it updated along the backend optimizations, even if it is in the middle of a MachineBasicBlock?<br>
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<div>I have an instruction that takes a relative address. E.g<br>
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<div>BB0:<br>
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<div> myInstruction BBN + 4*x<br>
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<div>BBN:<br>
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<div> ... x instructions ...<br>
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<div> target_instruction <<=== it points to here.<br>
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<div>The issues I have are:</div>
<div>1) I only see the ability to obtain basic-block addresses/labels, and these are only updated in terminator instructions. So by change that basic block is renamed/merged the value in myInstruction gets corrupt.<br>
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<div>2) Even if I set-up the instruction at the top of a basic block, eventually the BB gets merged, so just pointing to the BB label is not enough.<br>
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<div>I do see MCSymbol, but I don't get it. It seems to be resolved during asm printing.<br>
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<div>Thanks,<br>
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<div style="font-size:9pt; font-family:'arial' ,'helvetica' ,sans-serif"><span style="color:#4d4d4d; font-size:9pt"><strong>Diogo Sampaio</strong></span><br>
<span style="color:#11588f; font-size:9pt"><strong>Senior Compiler Engineer • Kalray</strong></span><br>
<span style="color:#11588f; font-size:8pt"><u>dsampaio@kalrayinc.com</u> • <a href="https://www.kalrayinc.com" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank" style="color:#11588f">
<u>www.kalrayinc.com</u></a></span> </div>
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