[llvm-commits] [llvm] r78157 - in /llvm/trunk: include/llvm/Analysis/LoopDependenceAnalysis.h lib/Analysis/LoopDependenceAnalysis.cpp test/Analysis/LoopDependenceAnalysis/alias.ll test/Analysis/LoopDependenceAnalysis/ziv.ll

[Andreas Bolka]

Author: abolka
Date: Tue Aug  4 23:26:05 2009
New Revision: 78157

URL: http://llvm.org/viewvc/llvm-project?rev=78157&view=rev
Log:
ZIV tester for LDA.

Modified:
    llvm/trunk/include/llvm/Analysis/LoopDependenceAnalysis.h
    llvm/trunk/lib/Analysis/LoopDependenceAnalysis.cpp
    llvm/trunk/test/Analysis/LoopDependenceAnalysis/alias.ll
    llvm/trunk/test/Analysis/LoopDependenceAnalysis/ziv.ll

Modified: llvm/trunk/include/llvm/Analysis/LoopDependenceAnalysis.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/LoopDependenceAnalysis.h?rev=78157&r1=78156&r2=78157&view=diff

==============================================================================
--- llvm/trunk/include/llvm/Analysis/LoopDependenceAnalysis.h (original)
+++ llvm/trunk/include/llvm/Analysis/LoopDependenceAnalysis.h Tue Aug  4 23:26:05 2009
@@ -77,6 +77,8 @@
   bool isAffine(const SCEV*) const;
 
   /// TODO: doc
+  bool isZIVPair(const SCEV*, const SCEV*) const;
+  DependenceResult analyseZIV(const SCEV*, const SCEV*, Subscript*) const;
   DependenceResult analyseSubscript(const SCEV*, const SCEV*, Subscript*) const;
   DependenceResult analysePair(DependencePair*) const;
 

Modified: llvm/trunk/lib/Analysis/LoopDependenceAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/LoopDependenceAnalysis.cpp?rev=78157&r1=78156&r2=78157&view=diff

==============================================================================
--- llvm/trunk/lib/Analysis/LoopDependenceAnalysis.cpp (original)
+++ llvm/trunk/lib/Analysis/LoopDependenceAnalysis.cpp Tue Aug  4 23:26:05 2009
@@ -136,6 +136,19 @@
   return isLoopInvariant(S) || (rec && rec->isAffine());
 }
 
+bool LoopDependenceAnalysis::isZIVPair(const SCEV *A, const SCEV *B) const {
+  return isLoopInvariant(A) && isLoopInvariant(B);
+}
+
+LoopDependenceAnalysis::DependenceResult
+LoopDependenceAnalysis::analyseZIV(const SCEV *A,
+                                   const SCEV *B,
+                                   Subscript *S) const {
+  assert(isZIVPair(A, B));
+  const SCEV *diff = SE->getMinusSCEV(A, B);
+  return diff->isZero() ? Dependent : Independent;
+}
+
 LoopDependenceAnalysis::DependenceResult
 LoopDependenceAnalysis::analyseSubscript(const SCEV *A,
                                          const SCEV *B,
@@ -152,7 +165,10 @@
     return Unknown;
   }
 
-  // TODO: Implement ZIV/SIV/MIV testers.
+  if (isZIVPair(A, B))
+    return analyseZIV(A, B, S);
+
+  // TODO: Implement SIV/MIV testers.
 
   DEBUG(errs() << "  -> [?] cannot analyse subscript\n");
   return Unknown;

Modified: llvm/trunk/test/Analysis/LoopDependenceAnalysis/alias.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/LoopDependenceAnalysis/alias.ll?rev=78157&r1=78156&r2=78157&view=diff

==============================================================================
--- llvm/trunk/test/Analysis/LoopDependenceAnalysis/alias.ll (original)
+++ llvm/trunk/test/Analysis/LoopDependenceAnalysis/alias.ll Tue Aug  4 23:26:05 2009
@@ -34,7 +34,7 @@
   %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
   %x = load i32* %x.ld.addr
   store i32 %x, i32* %x.st.addr
-; CHECK: 0,1: dep
+; CHECK: 0,1: ind
   %i.next = add i64 %i, 1
   %exitcond = icmp eq i64 %i.next, 256
   br i1 %exitcond, label %for.end, label %for.body

Modified: llvm/trunk/test/Analysis/LoopDependenceAnalysis/ziv.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/LoopDependenceAnalysis/ziv.ll?rev=78157&r1=78156&r2=78157&view=diff

==============================================================================
--- llvm/trunk/test/Analysis/LoopDependenceAnalysis/ziv.ll (original)
+++ llvm/trunk/test/Analysis/LoopDependenceAnalysis/ziv.ll Tue Aug  4 23:26:05 2009
@@ -12,7 +12,7 @@
   %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
   %x = load i32* getelementptr ([256 x i32]* @x, i32 0, i64 6)
   store i32 %x, i32* getelementptr ([256 x i32]* @x, i32 0, i64 5)
-; CHECK: 0,1: dep
+; CHECK: 0,1: ind
   %i.next = add i64 %i, 1
   %exitcond = icmp eq i64 %i.next, 256
   br i1 %exitcond, label %for.end, label %for.body
@@ -34,7 +34,7 @@
   %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
   %x = load i32* %x.ld.addr
   store i32 %x, i32* %x.st.addr
-; CHECK: 0,1: dep
+; CHECK: 0,1: ind
   %i.next = add i64 %i, 1
   %exitcond = icmp eq i64 %i.next, 256
   br i1 %exitcond, label %for.end, label %for.body