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[RISCV][NFC] Clean up RISCVDAGToDAGISel::Select 

As pointed out in post-commit review of r318738, `return ReplaceNode(..)` when 
both ReplaceNode and the current function return void is confusing. This patch 
moves to using a more obvious early return, and moves to just using an if to 
catch the one case we currently care about. A future patch that adds further 
custom instruction selection can introduce a switch.

llvm-svn: 318757
This commit is contained in:
Alex Bradbury 2017-11-21 12:00:19 +00:00
parent 51d82696db
commit 9caefe364a
1 changed files with 9 additions and 14 deletions
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23
llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
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@ -65,21 +65,16 @@ void RISCVDAGToDAGISel::Select(SDNode *Node) {
// Instruction Selection not handled by the auto-generated tablegen selection
// should be handled here.
EVT VT = Node->getValueType(0);
switch (Opcode) {
case ISD::Constant:
if (VT == XLenVT) {
ConstantSDNode *ConstNode = cast<ConstantSDNode>(Node);
// Materialize zero constants as copies from X0. This allows the coalescer
// to propagate these into other instructions.
if (ConstNode->isNullValue()) {
SDValue New = CurDAG->getCopyFromReg(CurDAG->getEntryNode(),
SDLoc(Node), RISCV::X0, XLenVT);
return ReplaceNode(Node, New.getNode());
}
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()) {
SDValue New = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), SDLoc(Node),
RISCV::X0, XLenVT);
ReplaceNode(Node, New.getNode());
return;
}
break;
default:
break;
}
// Select the default instruction.