diff options
| author | Preston Briggs <preston.briggs@gmail.com> | 2012-11-27 06:41:46 +0000 |
|---|---|---|
| committer | Preston Briggs <preston.briggs@gmail.com> | 2012-11-27 06:41:46 +0000 |
| commit | 6ee74f52e987036ced56293d50580f8208b863f5 (patch) | |
| tree | b8338e4999ab5d8140f0f293f9bbe01750bd77b3 /lib/Analysis/DependenceAnalysis.cpp | |
| parent | 69ea027e045f359b48bd436d530fc443a7cbb5c9 (diff) | |
| download | llvm-6ee74f52e987036ced56293d50580f8208b863f5.tar.gz llvm-6ee74f52e987036ced56293d50580f8208b863f5.tar.bz2 llvm-6ee74f52e987036ced56293d50580f8208b863f5.tar.xz | |
Modify depends(Src, Dst, PossiblyLoopIndependent).
If the Src and Dst are the same instruction,
no loop-independent dependence is possible,
so we force the PossiblyLoopIndependent flag to false.
The test case results are updated appropriately.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168678 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/DependenceAnalysis.cpp')
| -rw-r--r-- | lib/Analysis/DependenceAnalysis.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Analysis/DependenceAnalysis.cpp b/lib/Analysis/DependenceAnalysis.cpp index 684da98ce2..385e779a59 100644 --- a/lib/Analysis/DependenceAnalysis.cpp +++ b/lib/Analysis/DependenceAnalysis.cpp @@ -3199,6 +3199,9 @@ static void dumpSmallBitVector(SmallBitVector &BV) { Dependence *DependenceAnalysis::depends(Instruction *Src, Instruction *Dst, bool PossiblyLoopIndependent) { + if (Src == Dst) + PossiblyLoopIndependent = false; + if ((!Src->mayReadFromMemory() && !Src->mayWriteToMemory()) || (!Dst->mayReadFromMemory() && !Dst->mayWriteToMemory())) // if both instructions don't reference memory, there's no dependence |