[llvm-dev] wrong imm value for branch conditions..

[Mahesh Bodapati via llvm-dev]

Hi,



I have added Branch condition BGEID  like below…



*def : Pat<(brcond (setcc (i32 GR32:$L), (i32 GR32:$R), SETGE), bb:$T),*

* (BGEID (CMP GR32:$L, GR32:$R), bb:$T)>;*







  *def BGEID   : TBT<0b101110, (outs), (ins GR32:$ra, brtarget:$offset),
"bgeid\t$ra,$offset", [], IIC_BRc> {*

*    let rd = 0b10101;*

*}*





*def brtarget    : Operand<OtherVT>*

*{*

*  let PrintMethod = "printPCRelImmOperand";*

*  let EncoderMethod = "getBranchTargetOpValue";*

*  let OperandType = "OPERAND_PCREL";*

*  let DecoderMethod = "DecodeBranchTarget";*

*}*





*getBranchTargetOpValue**(const MCInst &MI, unsigned OpNo,*

*                       SmallVectorImpl<MCFixup> &Fixups,*

*                       const MCSubtargetInfo &STI) const {*



*   const MCOperand &MO = MI.getOperand(OpNo);*

*   printf("in getBranchTargetOpValue\n");*



*;*

*;*

*;*

* return 0;*

*}*





I have added code like above for bgeid instruction.I am able to genereate
bgeid instruction but the offset value is not proper.



  *9c:   14a53001        cmp     r5, r5, r6*

*  a0:   bea50005       bgeid   r5, 5           // a5*

*  a4:   b8100034        brid    52              // d8*



I am getting 5 as offset and it is pointing to invalid address. I tried to
fix it in *getBranchTargetOpValue* function but the control is not even
coming to *getBranchTargetOpValue.*



am I doing anything wrong here.



Thanking you in advance…





*Thanks,*

*Mahesh B*
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