diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Analysis/LoopDependenceAnalysis.cpp | 41 |
1 files changed, 35 insertions, 6 deletions
diff --git a/lib/Analysis/LoopDependenceAnalysis.cpp b/lib/Analysis/LoopDependenceAnalysis.cpp index eb8ea0e..d37273c 100644 --- a/lib/Analysis/LoopDependenceAnalysis.cpp +++ b/lib/Analysis/LoopDependenceAnalysis.cpp @@ -20,6 +20,7 @@ //===----------------------------------------------------------------------===// #define DEBUG_TYPE "lda" +#include "llvm/ADT/DenseSet.h" #include "llvm/ADT/Statistic.h" #include "llvm/Analysis/AliasAnalysis.h" #include "llvm/Analysis/LoopDependenceAnalysis.h" @@ -124,11 +125,18 @@ bool LoopDependenceAnalysis::findOrInsertDependencePair(Value *A, return false; } -bool LoopDependenceAnalysis::isLoopInvariant(const SCEV *S) const { +void LoopDependenceAnalysis::getLoops(const SCEV *S, + DenseSet<const Loop*>* Loops) const { + // Refactor this into an SCEVVisitor, if efficiency becomes a concern. for (const Loop *L = this->L; L != 0; L = L->getParentLoop()) if (!S->isLoopInvariant(L)) - return false; - return true; + Loops->insert(L); +} + +bool LoopDependenceAnalysis::isLoopInvariant(const SCEV *S) const { + DenseSet<const Loop*> loops; + getLoops(S, &loops); + return loops.empty(); } bool LoopDependenceAnalysis::isAffine(const SCEV *S) const { @@ -140,6 +148,13 @@ bool LoopDependenceAnalysis::isZIVPair(const SCEV *A, const SCEV *B) const { return isLoopInvariant(A) && isLoopInvariant(B); } +bool LoopDependenceAnalysis::isSIVPair(const SCEV *A, const SCEV *B) const { + DenseSet<const Loop*> loops; + getLoops(A, &loops); + getLoops(B, &loops); + return loops.size() == 1; +} + LoopDependenceAnalysis::DependenceResult LoopDependenceAnalysis::analyseZIV(const SCEV *A, const SCEV *B, @@ -149,6 +164,20 @@ LoopDependenceAnalysis::analyseZIV(const SCEV *A, } LoopDependenceAnalysis::DependenceResult +LoopDependenceAnalysis::analyseSIV(const SCEV *A, + const SCEV *B, + Subscript *S) const { + return Unknown; // TODO: Implement. +} + +LoopDependenceAnalysis::DependenceResult +LoopDependenceAnalysis::analyseMIV(const SCEV *A, + const SCEV *B, + Subscript *S) const { + return Unknown; // TODO: Implement. +} + +LoopDependenceAnalysis::DependenceResult LoopDependenceAnalysis::analyseSubscript(const SCEV *A, const SCEV *B, Subscript *S) const { @@ -167,10 +196,10 @@ LoopDependenceAnalysis::analyseSubscript(const SCEV *A, if (isZIVPair(A, B)) return analyseZIV(A, B, S); - // TODO: Implement SIV/MIV testers. + if (isSIVPair(A, B)) + return analyseSIV(A, B, S); - DEBUG(errs() << " -> [?] cannot analyse subscript\n"); - return Unknown; + return analyseMIV(A, B, S); } LoopDependenceAnalysis::DependenceResult |