<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Ok, <div><br></div><div>Scratching the surface this morning on Bug 1388. Happy to find that CCR has already been defined in ARMRegisterInfo.td</div><div><br></div><div>However all uses in the instruction info tablegen files indicate that a two-value operand can't be used where a dag node expects two operands.</div><div><div> </div><div><font class="Apple-style-span" face="'Courier New'"> // FIXME: should be able to write a pattern for ARMBrcond, but can't use</font></div><div><font class="Apple-style-span" face="'Courier New'"> // a two-value operand where a dag node expects two operands. :(</font></div><div><font class="Apple-style-span" face="'Courier New'"> def Bcc : ABI<0b1010, (outs), (ins br_target:$target),</font></div><div><font class="Apple-style-span" face="'Courier New'"> IIC_Br, "b", "\t$target",</font></div><div><font class="Apple-style-span" face="'Courier New'"> [/*(ARMbrcond bb:$target, imm:$cc, CCR:$ccr)*/]> {</font></div><div><font class="Apple-style-span" face="'Courier New'"> bits<24> target;</font></div><div><font class="Apple-style-span" face="'Courier New'"> let Inst{23-0} = target;</font></div><div><font class="Apple-style-span" face="'Courier New'"> let DecoderMethod = "DecodeBranchImmInstruction";</font></div><div><font class="Apple-style-span" face="'Courier New'"> }</font></div></div><div><font class="Apple-style-span" face="'Courier New'"><br></font></div><div><div><font class="Apple-style-span" face="'Courier New'">// FIXME: should be able to write a pattern for ARMcmov, but can't use</font></div><div><font class="Apple-style-span" face="'Courier New'">// a two-value operand where a dag node expects two operands. :(</font></div><div><font class="Apple-style-span" face="'Courier New'">let neverHasSideEffects = 1 in {</font></div><div><font class="Apple-style-span" face="'Courier New'">def MOVCCr : ARMPseudoInst<(outs GPR:$Rd), (ins GPR:$false, GPR:$Rm, pred:$p),</font></div><div><font class="Apple-style-span" face="'Courier New'"> 4, IIC_iCMOVr,</font></div><div><font class="Apple-style-span" face="'Courier New'"> [/*(set GPR:$Rd, (ARMcmov GPR:$false, GPR:$Rm, imm:$cc, CCR:$ccr))*/]>,</font></div><div><font class="Apple-style-span" face="'Courier New'"> RegConstraint<"$false = $Rd">;</font></div><div><br></div><div>It would appear that ISelDAGToDag and ISelLowering have "knowledge" of the CCR, but ... I'm wondering if that's a moot point since the instruction definitions could care less.</div><div><br></div><div>K, well I guess I get to learn more about the DAG data model in LLVM.</div><div><br></div><div>Any pointers would be much obliged... </div><div><br></div><div>Cheers,</div><div><br></div><div apple-content-edited="true">
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