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Add DAG parameter to ComputeNumSignBitsForTargetNode

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This way, you can check the number of sign bits in the
operands. The depth parameter it already has is pretty useless
without this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205649 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-04-04 20:13:13 +00:00
parent 912154008a
commit a134cec06b
5 changed files with 8 additions and 3 deletions
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1
include/llvm/Target/TargetLowering.h
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@ -1905,6 +1905,7 @@ public:
/// This method can be implemented by targets that want to expose additional
/// information about sign bits to the DAG Combiner.
virtual unsigned ComputeNumSignBitsForTargetNode(SDValue Op,
const SelectionDAG &DAG,
unsigned Depth = 0) const;
struct DAGCombinerInfo {

2
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -2422,7 +2422,7 @@ unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const{
Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||
Op.getOpcode() == ISD::INTRINSIC_W_CHAIN ||
Op.getOpcode() == ISD::INTRINSIC_VOID) {
unsigned NumBits = TLI->ComputeNumSignBitsForTargetNode(Op, Depth);
unsigned NumBits = TLI->ComputeNumSignBitsForTargetNode(Op, *this, Depth);
if (NumBits > 1) FirstAnswer = std::max(FirstAnswer, NumBits);
}

1
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -1074,6 +1074,7 @@ void TargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
/// targets that want to expose additional information about sign bits to the
/// DAG Combiner.
unsigned TargetLowering::ComputeNumSignBitsForTargetNode(SDValue Op,
const SelectionDAG &,
unsigned Depth) const {
assert((Op.getOpcode() >= ISD::BUILTIN_OP_END ||
Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||

6
lib/Target/X86/X86ISelLowering.cpp
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@ -16576,8 +16576,10 @@ void X86TargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
}
}
unsigned X86TargetLowering::ComputeNumSignBitsForTargetNode(SDValue Op,
unsigned Depth) const {
unsigned X86TargetLowering::ComputeNumSignBitsForTargetNode(
SDValue Op,
const SelectionDAG &,
unsigned Depth) const {
// SETCC_CARRY sets the dest to ~0 for true or 0 for false.
if (Op.getOpcode() == X86ISD::SETCC_CARRY)
return Op.getValueType().getScalarType().getSizeInBits();

1
lib/Target/X86/X86ISelLowering.h
View File

@ -626,6 +626,7 @@ namespace llvm {
// ComputeNumSignBitsForTargetNode - Determine the number of bits in the
// operation that are sign bits.
unsigned ComputeNumSignBitsForTargetNode(SDValue Op,
const SelectionDAG &DAG,
unsigned Depth) const override;
bool isGAPlusOffset(SDNode *N, const GlobalValue* &GA,