Define a PassID class to use when defining a pass. This allows for the type used for the ID field to be self documenting. It also allows for the compiler to know the set alignment of the ID object, which is useful for storing pointer identifiers within llvm data structures.

PiperOrigin-RevId: 235107957

1 files changed, 1 insertions, 3 deletions

diff --git a/mlir/lib/Transforms/MemRefDataFlowOpt.cpp b/mlir/lib/Transforms/MemRefDataFlowOpt.cpp
index 68bce854222..0ba06fecae0 100644
--- a/mlir/lib/Transforms/MemRefDataFlowOpt.cpp
+++ b/mlir/lib/Transforms/MemRefDataFlowOpt.cpp
@@ -84,13 +84,11 @@ struct MemRefDataFlowOpt : public FunctionPass {
   DominanceInfo *domInfo = nullptr;
   PostDominanceInfo *postDomInfo = nullptr;
 
-  static char passID;
+  constexpr static PassID passID = {};
 };
 
 } // end anonymous namespace
 
-char MemRefDataFlowOpt::passID = 0;
-
 /// Creates a pass to perform optimizations relying on memref dataflow such as
 /// store to load forwarding, elimination of dead stores, and dead allocs.
 FunctionPass *mlir::createMemRefDataFlowOptPass() {