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Implement hasComputableLoopEvolution for Add, Mul, and Trunc operators,

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since they can support trivial implementations. This avoids potentially
expensive traversals of the operands.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111031 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-08-13 20:03:15 +00:00
parent 6daf2a254b
commit ef0bedaba7
1 changed files with 18 additions and 0 deletions
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18
include/llvm/Analysis/ScalarEvolutionExpressions.h
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@ -126,6 +126,12 @@ namespace llvm {
public:
virtual void print(raw_ostream &OS) const;
virtual bool hasComputableLoopEvolution(const Loop *QL) const {
// Not computable. A truncate of an addrec is always folded into
// the addrec.
return false;
}
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVTruncateExpr *S) { return true; }
static inline bool classof(const SCEV *S) {
@ -294,6 +300,12 @@ namespace llvm {
}
public:
virtual bool hasComputableLoopEvolution(const Loop *QL) const {
// Not computable. An add of an addrec is always folded into the addrec
// if the other operands are loop-variant or loop-computable.
return false;
}
virtual const char *getOperationStr() const { return " + "; }
virtual const Type *getType() const {
@ -322,6 +334,12 @@ namespace llvm {
}
public:
virtual bool hasComputableLoopEvolution(const Loop *QL) const {
// Not computable. A mul of an addrec is always folded into the addrec
// if the other operands are loop-variant or loop-computable.
return false;
}
virtual const char *getOperationStr() const { return " * "; }
/// Methods for support type inquiry through isa, cast, and dyn_cast: