Split "rewrite" functionality out of Pattern into a new RewritePattern derived

class.  This change is NFC, but allows for new kinds of patterns, specifically
LegalizationPatterns which will be allowed to change the types of things they
rewrite.

PiperOrigin-RevId: 223243783

1 files changed, 10 insertions, 7 deletions

diff --git a/mlir/lib/IR/PatternMatch.cpp b/mlir/lib/IR/PatternMatch.cpp
index 11e9b94901f..a8b6aa1e738 100644
--- a/mlir/lib/IR/PatternMatch.cpp
+++ b/mlir/lib/IR/PatternMatch.cpp
@@ -51,19 +51,22 @@ Pattern::Pattern(StringRef rootName, PatternBenefit benefit,
                  MLIRContext *context)
     : rootKind(OperationName(rootName, context)), benefit(benefit) {}
 
-void Pattern::rewrite(Operation *op, std::unique_ptr<PatternState> state,
-                      PatternRewriter &rewriter) const {
+// Out-of-line vtable anchor.
+void Pattern::anchor() {}
+
+//===----------------------------------------------------------------------===//
+// RewritePattern and PatternRewriter implementation
+//===----------------------------------------------------------------------===//
+
+void RewritePattern::rewrite(Operation *op, std::unique_ptr<PatternState> state,
+                             PatternRewriter &rewriter) const {
   rewrite(op, rewriter);
 }
 
-void Pattern::rewrite(Operation *op, PatternRewriter &rewriter) const {
+void RewritePattern::rewrite(Operation *op, PatternRewriter &rewriter) const {
   llvm_unreachable("need to implement one of the rewrite functions!");
 }
 
-//===----------------------------------------------------------------------===//
-// PatternRewriter implementation
-//===----------------------------------------------------------------------===//
-
 PatternRewriter::~PatternRewriter() {
   // Out of line to provide a vtable anchor for the class.
 }