diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Vectorize/LoopVectorize.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index ac82a66b80..9e05cacbbe 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -1348,6 +1348,13 @@ bool LoopVectorizationLegality::canVectorizeMemory(BasicBlock &BB) { Reads.push_back(Ptr); } + // If we write (or read-write) to a single destination and there are no + // other reads in this loop then is it safe to vectorize. + if (ReadWrites.size() == 1 && Reads.size() == 0) { + DEBUG(dbgs() << "LV: Found a write-only loop!\n"); + return true; + } + // Now that the pointers are in two lists (Reads and ReadWrites), we // can check that there are no conflicts between each of the writes and // between the writes to the reads. |