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[SCEV] Fix issues found during the review of r251283. NFC. 

Summary:
Replace (const SCEVAddRecExpr *) with cast<SCEVAddRecExpr>.

Rename SCEVApplyRewriter to SCEVLoopAddRecRewriter (which is a more
appropriate name) since the description is "takes a scalar evolution
expression and applies the Map (Loop -> SCEV) to all AddRecExprs."

Subscribers: llvm-commits, sanjoy

Differential Revision: http://reviews.llvm.org/D14065

llvm-svn: 251292
This commit is contained in:
Silviu Baranga 2015-10-26 13:50:06 +00:00
parent 7a77149391
commit cb68efea3b
1 changed files with 8 additions and 7 deletions
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15
llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h
View File

@ -664,18 +664,19 @@ namespace llvm {
typedef DenseMap<const Loop*, const SCEV*> LoopToScevMapT;
/// The SCEVApplyRewriter takes a scalar evolution expression and applies
/// The SCEVLoopAddRecRewriter takes a scalar evolution expression and applies
/// the Map (Loop -> SCEV) to all AddRecExprs.
class SCEVApplyRewriter : public SCEVRewriteVisitor<SCEVApplyRewriter> {
class SCEVLoopAddRecRewriter
: public SCEVRewriteVisitor<SCEVLoopAddRecRewriter> {
public:
static const SCEV *rewrite(const SCEV *Scev, LoopToScevMapT &Map,
ScalarEvolution &SE) {
SCEVApplyRewriter Rewriter(SE, Map);
SCEVLoopAddRecRewriter Rewriter(SE, Map);
return Rewriter.visit(Scev);
}
SCEVApplyRewriter(ScalarEvolution &SE, LoopToScevMapT &M)
: SCEVRewriteVisitor(SE), Map(M) {}
SCEVLoopAddRecRewriter(ScalarEvolution &SE, LoopToScevMapT &M)
: SCEVRewriteVisitor(SE), Map(M) {}
const SCEV *visitAddRecExpr(const SCEVAddRecExpr *Expr) {
SmallVector<const SCEV *, 2> Operands;
@ -688,7 +689,7 @@ namespace llvm {
if (0 == Map.count(L))
return Res;
const SCEVAddRecExpr *Rec = (const SCEVAddRecExpr *) Res;
const SCEVAddRecExpr *Rec = cast<SCEVAddRecExpr>(Res);
return Rec->evaluateAtIteration(Map[L], SE);
}
@ -699,7 +700,7 @@ namespace llvm {
/// Applies the Map (Loop -> SCEV) to the given Scev.
static inline const SCEV *apply(const SCEV *Scev, LoopToScevMapT &Map,
ScalarEvolution &SE) {
return SCEVApplyRewriter::rewrite(Scev, Map, SE);
return SCEVLoopAddRecRewriter::rewrite(Scev, Map, SE);
}
}