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Instead of feature bits, you might use a more generic cl::opt/cl::list (e.g., cl::multi_val or cl::CommaSeparated) to</div>
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specify something like "-reserve-regs 8 32" or "-reserve-regs=8,32". This way, the user could specify a range of
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registers to reserve rather than each register individually. Bitvector UserReservedRegister would be set elsewhere</div>
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according to the global variable specified in your cl::opt/cl::list declaration.<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 Braden Nelson via llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Sent:</b> Saturday, March 27, 2021 9:22 PM<br>
<b>To:</b> llvm-dev@lists.llvm.org <llvm-dev@lists.llvm.org><br>
<b>Subject:</b> [llvm-dev] Handling user reserved registers on high register count architecture</font>
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<div class="PlainText">External email: Use caution opening links or attachments<br>
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I'm working with the Parallax Propeller 2, which has 496 allocatable<br>
registers. Needless to say, I can't do this:<br>
<br>
<br>
foreach i = {1-496} in<br>
def FeatureReserveR#i :<br>
SubtargetFeature<"reserve-r"#i, "UserReservedRegister[P2::R"#i#"]",<br>
"true", "Reserve R"#i>;<br>
<br>
So does anyone have a better idea?<br>
<br>
Thanks, Braden.<br>
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