Convert EXTRACT_SUBREG to COPY when emitting machine instrs.
EXTRACT_SUBREG no longer appears as a machine instruction. Use COPY instead.
Add isCopy() checks in many places using isMoveInstr() and isExtractSubreg().
The isMoveInstr hook will be removed later.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107879 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index f36620c..d7d63d3 100644
--- a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -428,12 +428,9 @@
}
if (Opc == TargetOpcode::EXTRACT_SUBREG) {
+ // EXTRACT_SUBREG is lowered as %dst = COPY %src:sub
unsigned SubIdx = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
- // Create the extract_subreg machine instruction.
- MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(),
- TII->get(TargetOpcode::EXTRACT_SUBREG));
-
// Figure out the register class to create for the destreg.
unsigned VReg = getVR(Node->getOperand(0), VRBaseMap);
const TargetRegisterClass *TRC = MRI->getRegClass(VReg);
@@ -450,11 +447,16 @@
VRBase = MRI->createVirtualRegister(SRC);
}
- // Add def, source, and subreg index
- MI->addOperand(MachineOperand::CreateReg(VRBase, true));
+ // Create the extract_subreg machine instruction.
+ MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(),
+ TII->get(TargetOpcode::COPY), VRBase);
+
+ // Add source, and subreg index
AddOperand(MI, Node->getOperand(0), 0, 0, VRBaseMap, /*IsDebug=*/false,
IsClone, IsCloned);
- MI->addOperand(MachineOperand::CreateImm(SubIdx));
+ assert(TargetRegisterInfo::isVirtualRegister(MI->getOperand(1).getReg()) &&
+ "Cannot yet extract from physregs");
+ MI->getOperand(1).setSubReg(SubIdx);
MBB->insert(InsertPos, MI);
} else if (Opc == TargetOpcode::INSERT_SUBREG ||
Opc == TargetOpcode::SUBREG_TO_REG) {