[LLVMdev] tablegen for fast isel

[Eric Christopher]

So that you don't have to explicitly write code to handle every case
in fast isel. You should take a look at the ARM or ARM64 fast isel
ports to get an idea of what you should do here.

-eric

On Wed, Apr 23, 2014 at 5:21 PM, reed kotler <rkotler at mips.com> wrote:
> What is the purpose of tablegen created files for fast-isel?
>
> If I make the following change to Makefile in lib/Target/Mips
>
>  BUILT_SOURCES = MipsGenRegisterInfo.inc MipsGenInstrInfo.inc \
>                  MipsGenAsmWriter.inc MipsGenCodeEmitter.inc \
>                  MipsGenDAGISel.inc MipsGenCallingConv.inc \
> -                MipsGenSubtargetInfo.inc MipsGenMCCodeEmitter.inc \
> +               MipsGenSubtargetInfo.inc MipsGenFastISel.inc
> MipsGenMCCodeEmitter.inc \
>                  MipsGenDisassemblerTables.inc \
>                  MipsGenMCPseudoLowering.inc MipsGenAsmMatcher.inc
>
>
> I get an error.
>
> Included from
> /home/rkotler/workspace/llvm/lib/Target/Mips/MipsInstrInfo.td:1474:
> /home/rkotler/workspace/llvm/lib/Target/Mips/Mips64InstrInfo.td:89:1: error:
> Duplicate record in FastISel table!
> def DSUB   : ArithLogicR<"dsub", GPR64Opnd, 0, II_DSUB, sub>, ADD_FM<0,
> 0x2e>;
> ^
> make[3]: ***
> [/home/rkotler/llvmw/build/lib/Target/Mips/Debug+Asserts/MipsGenFastISel.inc.tmp]
> Error 1
>
>
> Then it creates a blank file for MipsGenFastISel.inc and after that I get no
> build errors.
>
> I'm not sure what this is about .
>
> Any ideas?
>
> Tia.
>
> Reed
>
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