6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-17 21:35:07 +00:00
Code Issues Projects Releases Wiki Activity

Always use either MVT::i1 or getSetCCResultType for

Browse Source 
the condition of a SELECT node.  Make sure that the
correct extension type (any-, sign- or zero-extend)
is used.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57836 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2008-10-20 16:13:04 +00:00
parent ef5b199905
commit 7e49822875
1 changed files with 51 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
View File

@ -364,14 +364,18 @@ SDValue DAGTypeLegalizer::PromoteIntRes_SELECT_CC(SDNode *N) {
}
SDValue DAGTypeLegalizer::PromoteIntRes_SETCC(SDNode *N) {
MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
MVT SVT = TLI.getSetCCResultType(N->getOperand(0));
assert(isTypeLegal(SVT) && "SetCC type not legal??");
assert(isTypeLegal(SVT) && "Illegal SetCC type!");
// Get the SETCC result using the canonical SETCC type.
SDValue SetCC = DAG.getNode(ISD::SETCC, SVT, N->getOperand(0),
N->getOperand(1), N->getOperand(2));
// Convert to the expected type.
MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
assert(NVT.getSizeInBits() <= SVT.getSizeInBits() &&
"Integer type overpromoted?");
return DAG.getNode(ISD::TRUNCATE, NVT,
DAG.getNode(ISD::SETCC, SVT, N->getOperand(0),
N->getOperand(1), N->getOperand(2)));
return DAG.getNode(ISD::TRUNCATE, NVT, SetCC);
}
SDValue DAGTypeLegalizer::PromoteIntRes_SHL(SDNode *N) {
@ -731,18 +735,50 @@ SDValue DAGTypeLegalizer::PromoteIntOp_MEMBARRIER(SDNode *N) {
SDValue DAGTypeLegalizer::PromoteIntOp_SELECT(SDNode *N, unsigned OpNo) {
assert(OpNo == 0 && "Only know how to promote condition");
SDValue Cond = GetPromotedInteger(N->getOperand(0)); // Promote condition.
assert(N->getOperand(0).getValueType() == MVT::i1 &&
"SetCC type is not legal??");
SDValue Cond = GetPromotedInteger(N->getOperand(0));
// The top bits of the promoted condition are not necessarily zero, ensure
// that the value is properly zero extended.
unsigned BitWidth = Cond.getValueSizeInBits();
if (!DAG.MaskedValueIsZero(Cond,
APInt::getHighBitsSet(BitWidth, BitWidth-1)))
Cond = DAG.getZeroExtendInReg(Cond, MVT::i1);
// Promote all the way up to SVT, the canonical SetCC type.
MVT SVT = TLI.getSetCCResultType(Cond);
assert(isTypeLegal(SVT) && "Illegal SetCC type!");
assert(Cond.getValueSizeInBits() <= SVT.getSizeInBits() &&
"Integer type overpromoted?");
// The chain (Op#0) and basic block destination (Op#2) are always legal types.
return DAG.UpdateNodeOperands(SDValue(N, 0), Cond, N->getOperand(1),
N->getOperand(2));
// Make sure the extra bits conform to getSetCCResultContents. There are
// two sets of extra bits: those in Cond, which come from type promotion,
// and those we need to add to have the final type be SVT (for most targets
// this last set of bits is empty).
unsigned CondBits = Cond.getValueSizeInBits();
ISD::NodeType ExtendCode;
switch (TLI.getSetCCResultContents()) {
default:
assert(false && "Unknown SetCCResultValue!");
case TargetLowering::UndefinedSetCCResult:
// Extend to SVT by adding rubbish.
ExtendCode = ISD::ANY_EXTEND;
break;
case TargetLowering::ZeroOrOneSetCCResult:
ExtendCode = ISD::ZERO_EXTEND;
if (!DAG.MaskedValueIsZero(Cond,APInt::getHighBitsSet(CondBits,CondBits-1)))
// All extra bits need to be cleared. Do this by zero extending the
// original MVT::i1 condition value all the way to SVT.
Cond = N->getOperand(0);
break;
case TargetLowering::ZeroOrNegativeOneSetCCResult: {
ExtendCode = ISD::SIGN_EXTEND;
unsigned SignBits = DAG.ComputeNumSignBits(Cond);
if (SignBits != CondBits)
// All extra bits need to be sign extended. Do this by sign extending the
// original MVT::i1 condition value all the way to SVT.
Cond = N->getOperand(0);
break;
}
}
Cond = DAG.getNode(ExtendCode, SVT, Cond);
return DAG.UpdateNodeOperands(SDValue(N, 0), Cond,
N->getOperand(1), N->getOperand(2));
}
SDValue DAGTypeLegalizer::PromoteIntOp_SELECT_CC(SDNode *N, unsigned OpNo) {