================
@@ -1689,6 +1696,35 @@ Register
SystemZTargetLowering::getExceptionSelectorRegister(
return Subtarget.isTargetXPLINK64() ? SystemZ::R2D : SystemZ::R7D;
}
+// Lower @cc targets via setcc.
+SDValue SystemZTargetLowering::LowerAsmOutputForConstraint(
+ SDValue &Chain, SDValue &Glue, const SDLoc &DL,
+ const AsmOperandInfo &OpInfo, SelectionDAG &DAG) const {
+ if (StringRef("{@cc}").compare(OpInfo.ConstraintCode) != 0)
+ return SDValue();
+
+ // Check that return type is valid.
+ if (OpInfo.ConstraintVT.isVector() || !OpInfo.ConstraintVT.isInteger() ||
+ OpInfo.ConstraintVT.getSizeInBits() < 8)
+ report_fatal_error("Glue output operand is of invalid type");
+
+ MachineFunction &MF = DAG.getMachineFunction();
+ MachineRegisterInfo &MRI = MF.getRegInfo();
+ MRI.addLiveIn(SystemZ::CC);
+
+ if (Glue.getNode()) {
+ Glue = DAG.getCopyFromReg(Chain, DL, SystemZ::CC, MVT::i32, Glue);
+ Chain = Glue.getValue(1);
+ } else
+ Glue = DAG.getCopyFromReg(Chain, DL, SystemZ::CC, MVT::i32);
+
+ SDValue IPM = DAG.getNode(SystemZISD::IPM, DL, MVT::i32, Glue);
+ SDValue CC = DAG.getNode(ISD::SRL, DL, MVT::i32, IPM,
+ DAG.getConstant(SystemZ::IPM_CC, DL, MVT::i32));
----------------
uweigand wrote:
I guess we should use `getCCResult` here.
https://github.com/llvm/llvm-project/pull/125970
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