[flang][NFC] Use tablegen to create LoopVersioning constructor

[tblah]

The pass is currently defined as only considering function arguments as candidates for the optimization. I would prefer to generalise the pass for other top level operations only when there is a concrete use case before making too many assumptions about the current set of top level operations. Therefore I have not adapted this pass to run on all top level operations.

[llvmbot]

@llvm/pr-subscribers-flang-fir-hlfir

Author: Tom Eccles (tblah)

Changes

The pass is currently defined as only considering function arguments as candidates for the optimization. I would prefer to generalise the pass for other top level operations only when there is a concrete use case before making too many assumptions about the current set of top level operations. Therefore I have not adapted this pass to run on all top level operations.

---

Full diff: https://github.com/llvm/llvm-project/pull/90037.diff

4 Files Affected:

• (modified) flang/include/flang/Optimizer/Transforms/Passes.h (+1-1)
• (modified) flang/include/flang/Optimizer/Transforms/Passes.td (-1)
• (modified) flang/include/flang/Tools/CLOptions.inc (+1-1)
• (modified) flang/lib/Optimizer/Transforms/LoopVersioning.cpp (-4)

diff --git a/flang/include/flang/Optimizer/Transforms/Passes.h b/flang/include/flang/Optimizer/Transforms/Passes.h
index fd7a4a3883c996..613e606954652a 100644
--- a/flang/include/flang/Optimizer/Transforms/Passes.h
+++ b/flang/include/flang/Optimizer/Transforms/Passes.h
@@ -47,6 +47,7 @@ namespace fir {
 #define GEN_PASS_DECL_POLYMORPHICOPCONVERSION
 #define GEN_PASS_DECL_OPENACCDATAOPERANDCONVERSION
 #define GEN_PASS_DECL_ADDDEBUGINFO
+#define GEN_PASS_DECL_LOOPVERSIONING
 #include "flang/Optimizer/Transforms/Passes.h.inc"
 
 std::unique_ptr<mlir::Pass> createAffineDemotionPass();
@@ -62,7 +63,6 @@ std::unique_ptr<mlir::Pass> createStackArraysPass();
 std::unique_ptr<mlir::Pass> createAliasTagsPass();
 std::unique_ptr<mlir::Pass>
 createAddDebugInfoPass(fir::AddDebugInfoOptions options = {});
-std::unique_ptr<mlir::Pass> createLoopVersioningPass();
 
 std::unique_ptr<mlir::Pass>
 createMemoryAllocationPass(bool dynOnHeap, std::size_t maxStackSize);
diff --git a/flang/include/flang/Optimizer/Transforms/Passes.td b/flang/include/flang/Optimizer/Transforms/Passes.td
index c3d5c336af40ba..383b1628b7153c 100644
--- a/flang/include/flang/Optimizer/Transforms/Passes.td
+++ b/flang/include/flang/Optimizer/Transforms/Passes.td
@@ -321,7 +321,6 @@ def LoopVersioning : Pass<"loop-versioning", "mlir::func::FuncOp"> {
     an array has element sized stride. The element sizes stride allows some
     loops to be vectorized as well as other loop optimizations.
   }];
-  let constructor = "::fir::createLoopVersioningPass()";
   let dependentDialects = [ "fir::FIROpsDialect" ];
 }
 
diff --git a/flang/include/flang/Tools/CLOptions.inc b/flang/include/flang/Tools/CLOptions.inc
index f24716333d9acf..0b031abe0e6026 100644
--- a/flang/include/flang/Tools/CLOptions.inc
+++ b/flang/include/flang/Tools/CLOptions.inc
@@ -253,7 +253,7 @@ inline void createDefaultFIROptimizerPassPipeline(
   }
 
   if (pc.LoopVersioning)
-    pm.addPass(fir::createLoopVersioningPass());
+    pm.addPass(fir::createLoopVersioning());
 
   pm.addPass(mlir::createCSEPass());
 
diff --git a/flang/lib/Optimizer/Transforms/LoopVersioning.cpp b/flang/lib/Optimizer/Transforms/LoopVersioning.cpp
index 7cbd2dd1f897a5..0afc9c24b45b0f 100644
--- a/flang/lib/Optimizer/Transforms/LoopVersioning.cpp
+++ b/flang/lib/Optimizer/Transforms/LoopVersioning.cpp
@@ -556,7 +556,3 @@ void LoopVersioningPass::runOnOperation() {
 
   LLVM_DEBUG(llvm::dbgs() << "=== End " DEBUG_TYPE " ===\n");
 }
-
-std::unique_ptr<mlir::Pass> fir::createLoopVersioningPass() {
-  return std::make_unique<LoopVersioningPass>();
-}