[flang] Remove dead functions for getting LLVM intrinsics

[ashermancinelli]

In cleaning up LowLevelIntrinsics I found some uncalled functions. We would like to remove direct calls to llvm instructions wherever possible to make it easier on consumers of our IR to match LLVM intrinsics, so if this code is needed again we should use the op from the llvm dialect instead anyways.

[llvmbot]

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

Author: Asher Mancinelli (ashermancinelli)

Changes

In cleaning up LowLevelIntrinsics I found some uncalled functions. We would like to remove direct calls to llvm instructions wherever possible to make it easier on consumers of our IR to match LLVM intrinsics, so if this code is needed again we should use the op from the llvm dialect instead anyways.

---

Full diff: https://github.com/llvm/llvm-project/pull/137743.diff

2 Files Affected:

• (modified) flang/include/flang/Optimizer/Builder/LowLevelIntrinsics.h (-3)
• (modified) flang/lib/Optimizer/Builder/LowLevelIntrinsics.cpp (-10)

diff --git a/flang/include/flang/Optimizer/Builder/LowLevelIntrinsics.h b/flang/include/flang/Optimizer/Builder/LowLevelIntrinsics.h
index 45499906e39f8..9303f09d42fb9 100644
--- a/flang/include/flang/Optimizer/Builder/LowLevelIntrinsics.h
+++ b/flang/include/flang/Optimizer/Builder/LowLevelIntrinsics.h
@@ -24,9 +24,6 @@ class FirOpBuilder;
 
 namespace fir::factory {
 
-/// Get the LLVM intrinsic for `memset`. Use the 64 bit version.
-mlir::func::FuncOp getLlvmMemset(FirOpBuilder &builder);
-
 /// Get the C standard library `realloc` function.
 mlir::func::FuncOp getRealloc(FirOpBuilder &builder);
 
diff --git a/flang/lib/Optimizer/Builder/LowLevelIntrinsics.cpp b/flang/lib/Optimizer/Builder/LowLevelIntrinsics.cpp
index 73fd8fa0c2b61..64d70d70829fb 100644
--- a/flang/lib/Optimizer/Builder/LowLevelIntrinsics.cpp
+++ b/flang/lib/Optimizer/Builder/LowLevelIntrinsics.cpp
@@ -21,16 +21,6 @@
 #include "flang/Optimizer/Builder/LowLevelIntrinsics.h"
 #include "flang/Optimizer/Builder/FIRBuilder.h"
 
-mlir::func::FuncOp fir::factory::getLlvmMemset(fir::FirOpBuilder &builder) {
-  auto ptrTy = builder.getRefType(builder.getIntegerType(8));
-  llvm::SmallVector<mlir::Type> args = {ptrTy, ptrTy, builder.getI64Type(),
-                                        builder.getI1Type()};
-  auto memsetTy =
-      mlir::FunctionType::get(builder.getContext(), args, std::nullopt);
-  return builder.createFunction(builder.getUnknownLoc(),
-                                "llvm.memset.p0.p0.i64", memsetTy);
-}
-
 mlir::func::FuncOp fir::factory::getRealloc(fir::FirOpBuilder &builder) {
   auto ptrTy = builder.getRefType(builder.getIntegerType(8));
   llvm::SmallVector<mlir::Type> args = {ptrTy, builder.getI64Type()};

[vzakhari]

Thank you, Asher!