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implement promotion of BR_CC operands, fixing bisort on ppc.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42992 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-10-15 17:16:12 +00:00
parent 1296e9d306
commit cfc24007b1
1 changed files with 65 additions and 2 deletions
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67
lib/CodeGen/SelectionDAG/LegalizeDAGTypes.cpp
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@ -161,8 +161,11 @@ private:
SDOperand PromoteOperand_FP_ROUND(SDNode *N);
SDOperand PromoteOperand_SELECT(SDNode *N, unsigned OpNo);
SDOperand PromoteOperand_BRCOND(SDNode *N, unsigned OpNo);
SDOperand PromoteOperand_BR_CC(SDNode *N, unsigned OpNo);
SDOperand PromoteOperand_STORE(StoreSDNode *N, unsigned OpNo);
void PromoteSetCCOperands(SDOperand &LHS,SDOperand &RHS, ISD::CondCode Code);
// Operand Expansion.
bool ExpandOperand(SDNode *N, unsigned OperandNo);
SDOperand ExpandOperand_TRUNCATE(SDNode *N);
@ -328,7 +331,7 @@ void DAGTypeLegalizer::MarkNewNodes(SDNode *N) {
// Okay, we know that this node is new. Recursively walk all of its operands
// to see if they are new also. The depth of this walk is bounded by the size
// of the new tree that was constructed (usually 2-3 nodes), so we don't worry
// about revisitating of nodes.
// about revisiting of nodes.
//
// As we walk the operands, keep track of the number of nodes that are
// processed. If non-zero, this will become the new nodeid of this node.
@ -1141,6 +1144,8 @@ bool DAGTypeLegalizer::PromoteOperand(SDNode *N, unsigned OpNo) {
case ISD::SELECT: Res = PromoteOperand_SELECT(N, OpNo); break;
case ISD::BRCOND: Res = PromoteOperand_BRCOND(N, OpNo); break;
case ISD::BR_CC: Res = PromoteOperand_BR_CC(N, OpNo); break;
case ISD::STORE: Res = PromoteOperand_STORE(cast<StoreSDNode>(N),
OpNo); break;
}
@ -1226,6 +1231,64 @@ SDOperand DAGTypeLegalizer::PromoteOperand_BRCOND(SDNode *N, unsigned OpNo) {
N->getOperand(2));
}
SDOperand DAGTypeLegalizer::PromoteOperand_BR_CC(SDNode *N, unsigned OpNo) {
assert(OpNo == 2 && "Don't know how to promote this operand");
SDOperand LHS = N->getOperand(2);
SDOperand RHS = N->getOperand(3);
PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(1))->get());
// The chain (Op#0), CC (#1) and basic block destination (Op#4) are always
// legal types.
return DAG.UpdateNodeOperands(SDOperand(N, 0), N->getOperand(0),
N->getOperand(1), LHS, RHS, N->getOperand(4));
}
/// PromoteSetCCOperands - Promote the operands of a comparison. This code is
/// shared among BR_CC, SELECT_CC, and SETCC handlers.
void DAGTypeLegalizer::PromoteSetCCOperands(SDOperand &NewLHS,SDOperand &NewRHS,
ISD::CondCode CCCode) {
MVT::ValueType VT = NewLHS.getValueType();
// Get the promoted values.
NewLHS = GetPromotedOp(NewLHS);
NewRHS = GetPromotedOp(NewRHS);
// If this is an FP compare, the operands have already been extended.
if (!MVT::isInteger(NewLHS.getValueType()))
return;
// Otherwise, we have to insert explicit sign or zero extends. Note
// that we could insert sign extends for ALL conditions, but zero extend
// is cheaper on many machines (an AND instead of two shifts), so prefer
// it.
switch (CCCode) {
default: assert(0 && "Unknown integer comparison!");
case ISD::SETEQ:
case ISD::SETNE:
case ISD::SETUGE:
case ISD::SETUGT:
case ISD::SETULE:
case ISD::SETULT:
// ALL of these operations will work if we either sign or zero extend
// the operands (including the unsigned comparisons!). Zero extend is
// usually a simpler/cheaper operation, so prefer it.
NewLHS = DAG.getZeroExtendInReg(NewLHS, VT);
NewRHS = DAG.getZeroExtendInReg(NewRHS, VT);
return;
case ISD::SETGE:
case ISD::SETGT:
case ISD::SETLT:
case ISD::SETLE:
NewLHS = DAG.getNode(ISD::SIGN_EXTEND_INREG, NewLHS.getValueType(), NewLHS,
DAG.getValueType(VT));
NewRHS = DAG.getNode(ISD::SIGN_EXTEND_INREG, NewRHS.getValueType(), NewRHS,
DAG.getValueType(VT));
return;
}
}
SDOperand DAGTypeLegalizer::PromoteOperand_STORE(StoreSDNode *N, unsigned OpNo){
SDOperand Ch = N->getChain(), Ptr = N->getBasePtr();
int SVOffset = N->getSrcValueOffset();
@ -1316,7 +1379,7 @@ SDOperand DAGTypeLegalizer::ExpandOperand_SETCC(SDNode *N) {
DAG.getCondCode(CCCode));
}
/// ExpandSetCCOperands - Expand the operands to a comparison. This code is
/// ExpandSetCCOperands - Expand the operands of a comparison. This code is
/// shared among BR_CC, SELECT_CC, and SETCC handlers.
void DAGTypeLegalizer::ExpandSetCCOperands(SDOperand &NewLHS, SDOperand &NewRHS,
ISD::CondCode &CCCode) {