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SCEVRewriter: Optionally interpret constants in value map as SCEVConstant

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An upcoming loop vectorizer commit will want to replace a SCEVUnknown(Value*)
by a SCEVConstant. This commit modifies the SCEVParameterRewriter to support
this. The SCEVParameterRewriter constructor can optionally specify to follow
this behavior.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198949 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer 2014-01-10 18:20:29 +00:00
parent 3dbf2472fd
commit db81071b34
1 changed files with 12 additions and 6 deletions
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18
include/llvm/Analysis/ScalarEvolutionExpressions.h
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@ -563,13 +563,14 @@ namespace llvm {
: public SCEVVisitor<SCEVParameterRewriter, const SCEV*> { : public SCEVVisitor<SCEVParameterRewriter, const SCEV*> {
public: public:
static const SCEV *rewrite(const SCEV *Scev, ScalarEvolution &SE, static const SCEV *rewrite(const SCEV *Scev, ScalarEvolution &SE,
ValueToValueMap &Map) { ValueToValueMap &Map,
SCEVParameterRewriter Rewriter(SE, Map); bool InterpretConsts = false) {
SCEVParameterRewriter Rewriter(SE, Map, InterpretConsts);
return Rewriter.visit(Scev); return Rewriter.visit(Scev);
} }
SCEVParameterRewriter(ScalarEvolution &S, ValueToValueMap &M) SCEVParameterRewriter(ScalarEvolution &S, ValueToValueMap &M, bool C)
: SE(S), Map(M) {} : SE(S), Map(M), InterpretConsts(C) {}
const SCEV *visitConstant(const SCEVConstant *Constant) { const SCEV *visitConstant(const SCEVConstant *Constant) {
return Constant; return Constant;
@ -632,8 +633,12 @@ namespace llvm {
const SCEV *visitUnknown(const SCEVUnknown *Expr) { const SCEV *visitUnknown(const SCEVUnknown *Expr) {
Value *V = Expr->getValue(); Value *V = Expr->getValue();
if (Map.count(V)) if (Map.count(V)) {
return SE.getUnknown(Map[V]); Value *NV = Map[V];
if (InterpretConsts && isa<ConstantInt>(NV))
return SE.getConstant(cast<ConstantInt>(NV));
return SE.getUnknown(NV);
}
return Expr; return Expr;
} }
@ -644,6 +649,7 @@ namespace llvm {
private: private:
ScalarEvolution &SE; ScalarEvolution &SE;
ValueToValueMap &Map; ValueToValueMap &Map;
bool InterpretConsts;
}; };
typedef DenseMap<const Loop*, const SCEV*> LoopToScevMapT; typedef DenseMap<const Loop*, const SCEV*> LoopToScevMapT;