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Allow targets which produce setcc results in non-MVT::i1 registers to describe

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what the contents of the top bits of these registers are, in the common cases
of targets that sign and zero extend the results.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21145 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-04-07 19:41:18 +00:00
parent 2467392c59
commit 7b5987d56e
1 changed files with 23 additions and 1 deletions
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24
include/llvm/Target/TargetLowering.h
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@ -59,6 +59,12 @@ public:
Extend, // Oversized shift pulls in zeros or sign bits.
};
enum SetCCResultValue {
UndefinedSetCCResult, // SetCC returns a garbage/unknown extend.
ZeroOrOneSetCCResult, // SetCC returns a zero extended result.
ZeroOrNegativeOneSetCCResult, // SetCC returns a sign extended result.
};
TargetLowering(TargetMachine &TM);
virtual ~TargetLowering();
@ -68,9 +74,17 @@ public:
bool isLittleEndian() const { return IsLittleEndian; }
MVT::ValueType getPointerTy() const { return PointerTy; }
MVT::ValueType getShiftAmountTy() const { return ShiftAmountTy; }
MVT::ValueType getSetCCResultTy() const { return SetCCResultTy; }
OutOfRangeShiftAmount getShiftAmountFlavor() const {return ShiftAmtHandling; }
/// getSetCCResultTy - Return the ValueType of the result of setcc operations.
///
MVT::ValueType getSetCCResultTy() const { return SetCCResultTy; }
/// getSetCCResultContents - For targets without boolean registers, this flag
/// returns information about the contents of the high-bits in the setcc
/// result register.
SetCCResultValue getSetCCResultContents() const { return SetCCResultContents;}
/// getRegClassFor - Return the register class that should be used for the
/// specified value type. This may only be called on legal types.
TargetRegisterClass *getRegClassFor(MVT::ValueType VT) const {
@ -183,6 +197,10 @@ protected:
/// of a setcc operation. This defaults to the pointer type.
void setSetCCResultType(MVT::ValueType VT) { SetCCResultTy = VT; }
/// setSetCCResultContents - Specify how the target extends the result of a
/// setcc operation in a register.
void setSetCCResultContents(SetCCResultValue Ty) { SetCCResultContents = Ty; }
/// setShiftAmountFlavor - Describe how the target handles out of range shift
/// amounts.
void setShiftAmountFlavor(OutOfRangeShiftAmount OORSA) {
@ -296,6 +314,10 @@ private:
/// PointerTy.
MVT::ValueType SetCCResultTy;
/// SetCCResultContents - Information about the contents of the high-bits in
/// the result of a setcc comparison operation.
SetCCResultValue SetCCResultContents;
/// RegClassForVT - This indicates the default register class to use for
/// each ValueType the target supports natively.
TargetRegisterClass *RegClassForVT[MVT::LAST_VALUETYPE];