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Move MaskedValueIsZero from the DAGCombiner to the TargetLowering interface,

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making isMaskedValueZeroForTargetNode simpler, and useable from other parts
of the compiler.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25802 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-01-30 04:08:18 +00:00
parent 9247d0b12b
commit 553d8007ad
1 changed files with 14 additions and 6 deletions
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20
include/llvm/Target/TargetLowering.h
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@ -280,6 +280,17 @@ public:
return StackPointerRegisterToSaveRestore;
}
//===--------------------------------------------------------------------===//
// TargetLowering Optimization Methods
//
/// MaskedValueIsZero - Return true if 'Op & Mask' is known to be zero. We
/// use this predicate to simplify operations downstream. Op and Mask are
/// known to be the same type. Targets can implement the
/// isMaskedValueZeroForTargetNode method, to allow target nodes to be
/// understood.
bool MaskedValueIsZero(const SDOperand &Op, uint64_t Mask) const;
//===--------------------------------------------------------------------===//
// TargetLowering Configuration Methods - These methods should be invoked by
// the derived class constructor to configure this object for the target.
@ -413,12 +424,9 @@ public:
virtual const char *getTargetNodeName(unsigned Opcode) const;
/// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to
/// be zero. Op is expected to be a target specific node. Used by DAG
/// combiner. MVIZ is a function pointer to the main MaskedValueIsZero
/// function.
typedef bool (*MVIZFnPtr)(const SDOperand&, uint64_t, const TargetLowering &);
virtual bool isMaskedValueZeroForTargetNode(const SDOperand &Op,uint64_t Mask,
MVIZFnPtr MVIZ) const;
/// be zero. Op is expected to be a target specific node.
virtual bool isMaskedValueZeroForTargetNode(const SDOperand &Op,
uint64_t Mask) const;
//===--------------------------------------------------------------------===//
// Inline Asm Support hooks