Modified depends() to recognize that when all levels are "=" and
there's no possible loo-independent dependence, then there's no
dependence.
Updated all test result appropriately.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168719 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/DependenceAnalysis.cpp b/lib/Analysis/DependenceAnalysis.cpp
index 385e779..2068f1f 100644
--- a/lib/Analysis/DependenceAnalysis.cpp
+++ b/lib/Analysis/DependenceAnalysis.cpp
@@ -3563,8 +3563,10 @@
if (CompleteLoops[II])
Result.DV[II - 1].Scalar = false;
- // make sure loopIndepent flag is set correctly
if (PossiblyLoopIndependent) {
+ // Make sure the LoopIndependent flag is set correctly.
+ // All directions must include equal, otherwise no
+ // loop-independent dependence is possible.
for (unsigned II = 1; II <= CommonLevels; ++II) {
if (!(Result.getDirection(II) & Dependence::DVEntry::EQ)) {
Result.LoopIndependent = false;
@@ -3572,6 +3574,19 @@
}
}
}
+ else {
+ // On the other hand, if all directions are equal and there's no
+ // loop-independent dependence possible, then no dependence exists.
+ bool AllEqual = true;
+ for (unsigned II = 1; II <= CommonLevels; ++II) {
+ if (Result.getDirection(II) != Dependence::DVEntry::EQ) {
+ AllEqual = false;
+ break;
+ }
+ }
+ if (AllEqual)
+ return NULL;
+ }
FullDependence *Final = new FullDependence(Result);
Result.DV = NULL;