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Convert EXTRACT_SUBREG to COPY when emitting machine instrs.

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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
This commit is contained in:
Jakob Stoklund Olesen
2010-07-08 16:40:22 +00:00
parent 5c00e07795
commit 0bc25f4040
18 changed files with 103 additions and 131 deletions
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lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+9 -7
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@@ -428,12 +428,9 @@ void InstrEmitter::EmitSubregNode(SDNode *Node,
}
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 @@ void InstrEmitter::EmitSubregNode(SDNode *Node,
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) {