maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[RISCV][NFC] Refactor RISCVDAGToDAGISel::Select 

Introduce and use a switch on the opcode.

llvm-svn: 343688
This commit is contained in:
Alex Bradbury 2018-10-03 13:13:13 +00:00
parent 99031b79a6
commit d33ffe9bb1
1 changed files with 12 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
View File

@ -66,10 +66,7 @@ void RISCVDAGToDAGISel::PostprocessISelDAG() {
}
void RISCVDAGToDAGISel::Select(SDNode *Node) {
unsigned Opcode = Node->getOpcode();
MVT XLenVT = Subtarget->getXLenVT();
// If we have a custom node, we have already selected
// If we have a custom node, we have already selected.
if (Node->isMachineOpcode()) {
LLVM_DEBUG(dbgs() << "== "; Node->dump(CurDAG); dbgs() << "\n");
Node->setNodeId(-1);
@ -78,27 +75,30 @@ void RISCVDAGToDAGISel::Select(SDNode *Node) {
// Instruction Selection not handled by the auto-generated tablegen selection
// should be handled here.
unsigned Opcode = Node->getOpcode();
MVT XLenVT = Subtarget->getXLenVT();
SDLoc DL(Node);
EVT VT = Node->getValueType(0);
if (Opcode == ISD::Constant && VT == XLenVT) {
auto *ConstNode = cast<ConstantSDNode>(Node);
// Materialize zero constants as copies from X0. This allows the coalescer
// to propagate these into other instructions.
if (ConstNode->isNullValue()) {
switch (Opcode) {
case ISD::Constant: {
auto ConstNode = cast<ConstantSDNode>(Node);
if (VT == XLenVT && ConstNode->isNullValue()) {
SDValue New = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), SDLoc(Node),
RISCV::X0, XLenVT);
ReplaceNode(Node, New.getNode());
return;
}
break;
}
if (Opcode == ISD::FrameIndex) {
SDLoc DL(Node);
case ISD::FrameIndex: {
SDValue Imm = CurDAG->getTargetConstant(0, DL, XLenVT);
int FI = cast<FrameIndexSDNode>(Node)->getIndex();
EVT VT = Node->getValueType(0);
SDValue TFI = CurDAG->getTargetFrameIndex(FI, VT);
ReplaceNode(Node, CurDAG->getMachineNode(RISCV::ADDI, DL, VT, TFI, Imm));
return;
}
}
// Select the default instruction.
SelectCode(Node);