[llvm-dev] Question about Decoding Conflict of DisassemblerTables from TableGen

Hal Finkel via llvm-dev llvm-dev at lists.llvm.org
Sat Dec 5 05:38:54 PST 2015

Hi JinGu,

You can use different DecoderNamespace values in order to separate out different conflict-free groups. For a simple example, look at how QPX disassembly is handled in the PowerPC backend.


----- Original Message -----
> From: "jingu kang via llvm-dev" <llvm-dev at lists.llvm.org>
> To: llvm-dev at lists.llvm.org
> Sent: Saturday, December 5, 2015 5:37:00 AM
> Subject: [llvm-dev] Question about Decoding Conflict of DisassemblerTables	from TableGen
> Hi All,
> I have faced decoding conflict of DisassemblerTables from TableGen. I
> have instructions with same encoding and different mnemonic among
> different architecture versions. I have used Predicates and
> AssemblerPredicates to distinguish them on Codegen and Assembler but
> it does not work on Disassembler. When I look at
> TableGen/FixedLenDecoderEmitter.cpp, once there is decoding conflict,
> tablegen does not generate table entry. I think it means even though
> there are predicates, it does not affect to the table entry. Could
> someone let me know how to avoid decoding conflict in this situation?
> If I missed something, please let me know.
> Thanks,
> JinGu Kang
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Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory

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