[llvm-dev] Question regarding ARM ADDri instruction
Eli Friedman via llvm-dev
llvm-dev at lists.llvm.org
Mon Jan 21 13:17:39 PST 2019
The fix you're describing is probably correct. That said, as far as I
can tell, basically nothing in the ARM backend actually cares about the
OperandType of an instruction, so I don't think it has any practical impact.
On 1/21/2019 7:03 AM, Boekle, Yannick via llvm-dev wrote:
> Hi all,
> I noticed that for the ARM instruction "ADDri" (which I assume to be
> "add register immediate") the 3rd operand which should intuitively
> have operand type MCOI::OPERAND_IMMEDIATE actually has
> MCOI::OPERAND_UNKNOWN (you can see this in ARMGenInstrInfo.inc inside
> the build folder).
> I fixed this by adding the line "let OperandType = OPERAND_IMMEDIATE;"
> in lib/Target/ARM/ARMInstrInfo.td in the definition of mod_imm (line 692).
> Is this an actual bug? And if so, what could be a proper fix? I'm not
> familiar with the intricacies of the ARM tablegen structure.
> I'm working on
> branch: release_80
> commit: 8779077dde876ddfb6dfbe7f1da338f820a8fa13
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