[mlir] Replace LLVM_ATTRIBUTE_UNUSED with [[maybe_unused]] (NFC) #163703

kazutakahirata · 2025-10-16T05:38:49Z

This patch replaces LLVM_ATTRIBUTE_UNUSED with [[maybe_unused]],
introduced as part of C++17.

This patch replaces LLVM_ATTRIBUTE_UNUSED with [[maybe_unused]], introduced as part of C++17.

llvmbot · 2025-10-16T05:39:19Z

@llvm/pr-subscribers-mlir-core
@llvm/pr-subscribers-mlir-affine
@llvm/pr-subscribers-mlir

@llvm/pr-subscribers-mlir-presburger

Author: Kazu Hirata (kazutakahirata)

Changes

This patch replaces LLVM_ATTRIBUTE_UNUSED with [[maybe_unused]],
introduced as part of C++17.

Full diff: https://github.com/llvm/llvm-project/pull/163703.diff

16 Files Affected:

(modified) mlir/include/mlir/Dialect/Affine/LoopUtils.h (+1-1)
(modified) mlir/lib/Analysis/FlatLinearValueConstraints.cpp (+5-4)
(modified) mlir/lib/Analysis/Presburger/Simplex.cpp (+1-1)
(modified) mlir/lib/Dialect/Affine/IR/AffineOps.cpp (+5-5)
(modified) mlir/lib/Dialect/Affine/Utils/LoopUtils.cpp (+2-3)
(modified) mlir/lib/Dialect/LLVMIR/IR/LLVMTypes.cpp (+3-3)
(modified) mlir/lib/Dialect/SparseTensor/IR/Detail/Var.cpp (+2-2)
(modified) mlir/lib/Dialect/SparseTensor/Transforms/Utils/LoopEmitter.cpp (+2-2)
(modified) mlir/lib/Dialect/Transform/IR/TransformTypes.cpp (+3-3)
(modified) mlir/lib/IR/MLIRContext.cpp (+1-1)
(modified) mlir/lib/Tools/PDLL/CodeGen/CPPGen.cpp (+1-1)
(modified) mlir/test/lib/Dialect/Transform/TestTransformDialectExtension.cpp (+3-3)
(modified) mlir/test/mlir-pdll/CodeGen/CPP/general.pdll (+1-1)
(modified) mlir/tools/mlir-tblgen/LLVMIRConversionGen.cpp (+6-7)
(modified) mlir/tools/mlir-tblgen/RewriterGen.cpp (+1-1)
(modified) mlir/unittests/Dialect/SparseTensor/MergerTest.cpp (+1-2)

diff --git a/mlir/include/mlir/Dialect/Affine/LoopUtils.h b/mlir/include/mlir/Dialect/Affine/LoopUtils.h
index 9b59af73977d3..830c394f0bde6 100644
--- a/mlir/include/mlir/Dialect/Affine/LoopUtils.h
+++ b/mlir/include/mlir/Dialect/Affine/LoopUtils.h
@@ -61,7 +61,7 @@ LogicalResult loopUnrollUpToFactor(AffineForOp forOp, uint64_t unrollFactor);
 
 /// Returns true if `loops` is a perfectly nested loop nest, where loops appear
 /// in it from outermost to innermost.
-bool LLVM_ATTRIBUTE_UNUSED isPerfectlyNested(ArrayRef<AffineForOp> loops);
+[[maybe_unused]] bool isPerfectlyNested(ArrayRef<AffineForOp> loops);
 
 /// Get perfectly nested sequence of loops starting at root of loop nest
 /// (the first op being another AffineFor, and the second op - a terminator).
diff --git a/mlir/lib/Analysis/FlatLinearValueConstraints.cpp b/mlir/lib/Analysis/FlatLinearValueConstraints.cpp
index 30ce1fb320017..6588b53cbd9f8 100644
--- a/mlir/lib/Analysis/FlatLinearValueConstraints.cpp
+++ b/mlir/lib/Analysis/FlatLinearValueConstraints.cpp
@@ -1244,8 +1244,9 @@ bool FlatLinearValueConstraints::areVarsAlignedWithOther(
 
 /// Checks if the SSA values associated with `cst`'s variables in range
 /// [start, end) are unique.
-static bool LLVM_ATTRIBUTE_UNUSED areVarsUnique(
-    const FlatLinearValueConstraints &cst, unsigned start, unsigned end) {
+[[maybe_unused]] static bool
+areVarsUnique(const FlatLinearValueConstraints &cst, unsigned start,
+              unsigned end) {
 
   assert(start <= cst.getNumDimAndSymbolVars() &&
          "Start position out of bounds");
@@ -1267,14 +1268,14 @@ static bool LLVM_ATTRIBUTE_UNUSED areVarsUnique(
 }
 
 /// Checks if the SSA values associated with `cst`'s variables are unique.
-static bool LLVM_ATTRIBUTE_UNUSED
+[[maybe_unused]] static bool
 areVarsUnique(const FlatLinearValueConstraints &cst) {
   return areVarsUnique(cst, 0, cst.getNumDimAndSymbolVars());
 }
 
 /// Checks if the SSA values associated with `cst`'s variables of kind `kind`
 /// are unique.
-static bool LLVM_ATTRIBUTE_UNUSED
+[[maybe_unused]] static bool
 areVarsUnique(const FlatLinearValueConstraints &cst, VarKind kind) {
 
   if (kind == VarKind::SetDim)
diff --git a/mlir/lib/Analysis/Presburger/Simplex.cpp b/mlir/lib/Analysis/Presburger/Simplex.cpp
index a1cbe2990c67d..547a4c2c99db7 100644
--- a/mlir/lib/Analysis/Presburger/Simplex.cpp
+++ b/mlir/lib/Analysis/Presburger/Simplex.cpp
@@ -34,7 +34,7 @@ using Direction = Simplex::Direction;
 const int nullIndex = std::numeric_limits<int>::max();
 
 // Return a + scale*b;
-LLVM_ATTRIBUTE_UNUSED
+[[maybe_unused]]
 static SmallVector<DynamicAPInt, 8>
 scaleAndAddForAssert(ArrayRef<DynamicAPInt> a, const DynamicAPInt &scale,
                      ArrayRef<DynamicAPInt> b) {
diff --git a/mlir/lib/Dialect/Affine/IR/AffineOps.cpp b/mlir/lib/Dialect/Affine/IR/AffineOps.cpp
index 7e5ce26b5f733..1f419ddd5c9b9 100644
--- a/mlir/lib/Dialect/Affine/IR/AffineOps.cpp
+++ b/mlir/lib/Dialect/Affine/IR/AffineOps.cpp
@@ -125,9 +125,9 @@ static bool remainsLegalAfterInline(OpTy op, Region *src, Region *dest,
 //  Use "unused attribute" marker to silence clang-tidy warning stemming from
 //  the inability to see through "llvm::TypeSwitch".
 template <>
-bool LLVM_ATTRIBUTE_UNUSED remainsLegalAfterInline(AffineApplyOp op,
-                                                   Region *src, Region *dest,
-                                                   const IRMapping &mapping) {
+[[maybe_unused]] bool remainsLegalAfterInline(AffineApplyOp op, Region *src,
+                                              Region *dest,
+                                              const IRMapping &mapping) {
   // If it's a valid dimension, we need to check that it remains so.
   if (isValidDim(op.getResult(), src))
     return remainsLegalAfterInline(
@@ -1032,8 +1032,8 @@ static void simplifyMinOrMaxExprWithOperands(AffineMap &map,
 /// Simplify the map while exploiting information on the values in `operands`.
 //  Use "unused attribute" marker to silence warning stemming from the inability
 //  to see through the template expansion.
-static void LLVM_ATTRIBUTE_UNUSED
-simplifyMapWithOperands(AffineMap &map, ArrayRef<Value> operands) {
+[[maybe_unused]] static void simplifyMapWithOperands(AffineMap &map,
+                                                     ArrayRef<Value> operands) {
   assert(map.getNumInputs() == operands.size() && "invalid operands for map");
   SmallVector<AffineExpr> newResults;
   newResults.reserve(map.getNumResults());
diff --git a/mlir/lib/Dialect/Affine/Utils/LoopUtils.cpp b/mlir/lib/Dialect/Affine/Utils/LoopUtils.cpp
index cd216efb66992..4743941deff3f 100644
--- a/mlir/lib/Dialect/Affine/Utils/LoopUtils.cpp
+++ b/mlir/lib/Dialect/Affine/Utils/LoopUtils.cpp
@@ -1357,7 +1357,7 @@ bool mlir::affine::isValidLoopInterchangePermutation(
 
 /// Returns true if `loops` is a perfectly nested loop nest, where loops appear
 /// in it from outermost to innermost.
-bool LLVM_ATTRIBUTE_UNUSED
+[[maybe_unused]] bool
 mlir::affine::isPerfectlyNested(ArrayRef<AffineForOp> loops) {
   assert(!loops.empty() && "no loops provided");
 
@@ -1920,8 +1920,7 @@ generatePointWiseCopy(Location loc, Value memref, Value fastMemRef,
   return copyNestRoot;
 }
 
-static InFlightDiagnostic LLVM_ATTRIBUTE_UNUSED
-emitRemarkForBlock(Block &block) {
+[[maybe_unused]] static InFlightDiagnostic emitRemarkForBlock(Block &block) {
   return block.getParentOp()->emitRemark();
 }
 
diff --git a/mlir/lib/Dialect/LLVMIR/IR/LLVMTypes.cpp b/mlir/lib/Dialect/LLVMIR/IR/LLVMTypes.cpp
index 01a16ce2d8a7f..ac35eea66e9d6 100644
--- a/mlir/lib/Dialect/LLVMIR/IR/LLVMTypes.cpp
+++ b/mlir/lib/Dialect/LLVMIR/IR/LLVMTypes.cpp
@@ -134,10 +134,10 @@ static void printExtTypeParams(AsmPrinter &p, ArrayRef<Type> typeParams,
 
 /// These are unused for now.
 /// TODO: Move over to these once more types have been migrated to TypeDef.
-LLVM_ATTRIBUTE_UNUSED static OptionalParseResult
+[[maybe_unused]] static OptionalParseResult
 generatedTypeParser(AsmParser &parser, StringRef *mnemonic, Type &value);
-LLVM_ATTRIBUTE_UNUSED static LogicalResult
-generatedTypePrinter(Type def, AsmPrinter &printer);
+[[maybe_unused]] static LogicalResult generatedTypePrinter(Type def,
+                                                           AsmPrinter &printer);
 
 #include "mlir/Dialect/LLVMIR/LLVMTypeInterfaces.cpp.inc"
 
diff --git a/mlir/lib/Dialect/SparseTensor/IR/Detail/Var.cpp b/mlir/lib/Dialect/SparseTensor/IR/Detail/Var.cpp
index a1711a69ce8d6..069191c21b091 100644
--- a/mlir/lib/Dialect/SparseTensor/IR/Detail/Var.cpp
+++ b/mlir/lib/Dialect/SparseTensor/IR/Detail/Var.cpp
@@ -143,8 +143,8 @@ void VarInfo::setNum(Var::Num n) {
 
 /// Helper function for `assertUsageConsistency` to better handle SMLoc
 /// mismatches.
-LLVM_ATTRIBUTE_UNUSED static llvm::SMLoc
-minSMLoc(AsmParser &parser, llvm::SMLoc sm1, llvm::SMLoc sm2) {
+[[maybe_unused]] static llvm::SMLoc minSMLoc(AsmParser &parser, llvm::SMLoc sm1,
+                                             llvm::SMLoc sm2) {
   const auto loc1 = dyn_cast<FileLineColLoc>(parser.getEncodedSourceLoc(sm1));
   assert(loc1 && "Could not get `FileLineColLoc` for first `SMLoc`");
   const auto loc2 = dyn_cast<FileLineColLoc>(parser.getEncodedSourceLoc(sm2));
diff --git a/mlir/lib/Dialect/SparseTensor/Transforms/Utils/LoopEmitter.cpp b/mlir/lib/Dialect/SparseTensor/Transforms/Utils/LoopEmitter.cpp
index f53950242e10c..684c088eb9b0f 100644
--- a/mlir/lib/Dialect/SparseTensor/Transforms/Utils/LoopEmitter.cpp
+++ b/mlir/lib/Dialect/SparseTensor/Transforms/Utils/LoopEmitter.cpp
@@ -43,8 +43,8 @@ using namespace mlir::sparse_tensor;
 //===----------------------------------------------------------------------===//
 
 #ifndef NDEBUG
-LLVM_ATTRIBUTE_UNUSED static void dumpIndexMemRef(OpBuilder &builder,
-                                                  Location loc, Value memref) {
+[[maybe_unused]] static void dumpIndexMemRef(OpBuilder &builder, Location loc,
+                                             Value memref) {
   memref = memref::CastOp::create(
       builder, loc, UnrankedMemRefType::get(builder.getIndexType(), 0), memref);
   createFuncCall(builder, loc, "printMemrefInd", TypeRange{},
diff --git a/mlir/lib/Dialect/Transform/IR/TransformTypes.cpp b/mlir/lib/Dialect/Transform/IR/TransformTypes.cpp
index 9a24c2baebabb..a2cff6acecd5a 100644
--- a/mlir/lib/Dialect/Transform/IR/TransformTypes.cpp
+++ b/mlir/lib/Dialect/Transform/IR/TransformTypes.cpp
@@ -21,10 +21,10 @@ using namespace mlir;
 
 // These are automatically generated by ODS but are not used as the Transform
 // dialect uses a different dispatch mechanism to support dialect extensions.
-LLVM_ATTRIBUTE_UNUSED static OptionalParseResult
+[[maybe_unused]] static OptionalParseResult
 generatedTypeParser(AsmParser &parser, StringRef *mnemonic, Type &value);
-LLVM_ATTRIBUTE_UNUSED static LogicalResult
-generatedTypePrinter(Type def, AsmPrinter &printer);
+[[maybe_unused]] static LogicalResult generatedTypePrinter(Type def,
+                                                           AsmPrinter &printer);
 
 #define GET_TYPEDEF_CLASSES
 #include "mlir/Dialect/Transform/IR/TransformTypes.cpp.inc"
diff --git a/mlir/lib/IR/MLIRContext.cpp b/mlir/lib/IR/MLIRContext.cpp
index 89b81cfb1e2f9..5f63fe6d81662 100644
--- a/mlir/lib/IR/MLIRContext.cpp
+++ b/mlir/lib/IR/MLIRContext.cpp
@@ -1204,7 +1204,7 @@ AffineMap AffineMap::getImpl(unsigned dimCount, unsigned symbolCount,
 /// present in result expressions is less than `dimCount` and the highest index
 /// of symbolic identifier present in result expressions is less than
 /// `symbolCount`.
-LLVM_ATTRIBUTE_UNUSED static bool
+[[maybe_unused]] static bool
 willBeValidAffineMap(unsigned dimCount, unsigned symbolCount,
                      ArrayRef<AffineExpr> results) {
   int64_t maxDimPosition = -1;
diff --git a/mlir/lib/Tools/PDLL/CodeGen/CPPGen.cpp b/mlir/lib/Tools/PDLL/CodeGen/CPPGen.cpp
index 9670285e767b8..3fda5a7a93344 100644
--- a/mlir/lib/Tools/PDLL/CodeGen/CPPGen.cpp
+++ b/mlir/lib/Tools/PDLL/CodeGen/CPPGen.cpp
@@ -93,7 +93,7 @@ void CodeGen::generate(const ast::Module &astModule, ModuleOp module) {
 
   // Emit function to add the generated matchers to the pattern list.
   os << "template <typename... ConfigsT>\n"
-        "static void LLVM_ATTRIBUTE_UNUSED populateGeneratedPDLLPatterns("
+        "[[maybe_unused]] static void populateGeneratedPDLLPatterns("
         "::mlir::RewritePatternSet &patterns, ConfigsT &&...configs) {\n";
   for (const auto &name : patternNames)
     os << "  patterns.add<" << name
diff --git a/mlir/test/lib/Dialect/Transform/TestTransformDialectExtension.cpp b/mlir/test/lib/Dialect/Transform/TestTransformDialectExtension.cpp
index 97fc699636566..496f18bc49fad 100644
--- a/mlir/test/lib/Dialect/Transform/TestTransformDialectExtension.cpp
+++ b/mlir/test/lib/Dialect/Transform/TestTransformDialectExtension.cpp
@@ -938,10 +938,10 @@ class TestTransformDialectExtension
 
 // These are automatically generated by ODS but are not used as the Transform
 // dialect uses a different dispatch mechanism to support dialect extensions.
-LLVM_ATTRIBUTE_UNUSED static OptionalParseResult
+[[maybe_unused]] static OptionalParseResult
 generatedTypeParser(AsmParser &parser, StringRef *mnemonic, Type &value);
-LLVM_ATTRIBUTE_UNUSED static LogicalResult
-generatedTypePrinter(Type def, AsmPrinter &printer);
+[[maybe_unused]] static LogicalResult generatedTypePrinter(Type def,
+                                                           AsmPrinter &printer);
 
 #define GET_TYPEDEF_CLASSES
 #include "TestTransformDialectExtensionTypes.cpp.inc"
diff --git a/mlir/test/mlir-pdll/CodeGen/CPP/general.pdll b/mlir/test/mlir-pdll/CodeGen/CPP/general.pdll
index 4e869e5dbcebe..4be30d86dda35 100644
--- a/mlir/test/mlir-pdll/CodeGen/CPP/general.pdll
+++ b/mlir/test/mlir-pdll/CodeGen/CPP/general.pdll
@@ -28,7 +28,7 @@
 // CHECK:      operation "test.op3"
 // CHECK:  )mlir", context), std::forward<ConfigsT>(configs)...)
 
-// CHECK:      static void LLVM_ATTRIBUTE_UNUSED populateGeneratedPDLLPatterns(::mlir::RewritePatternSet &patterns, ConfigsT &&...configs) {
+// CHECK{LITERAL}: [[maybe_unused]] static void populateGeneratedPDLLPatterns(::mlir::RewritePatternSet &patterns, ConfigsT &&...configs) {
 // CHECK-NEXT:   patterns.add<GeneratedPDLLPattern0>(patterns.getContext(), configs...);
 // CHECK-NEXT:   patterns.add<NamedPattern>(patterns.getContext(), configs...);
 // CHECK-NEXT:   patterns.add<GeneratedPDLLPattern1>(patterns.getContext(), configs...);
diff --git a/mlir/tools/mlir-tblgen/LLVMIRConversionGen.cpp b/mlir/tools/mlir-tblgen/LLVMIRConversionGen.cpp
index 96af14d36817b..11a2db4a1cc67 100644
--- a/mlir/tools/mlir-tblgen/LLVMIRConversionGen.cpp
+++ b/mlir/tools/mlir-tblgen/LLVMIRConversionGen.cpp
@@ -416,7 +416,7 @@ static void emitOneEnumToConversion(const Record *record, raw_ostream &os) {
 
   // Emit the function converting the enum attribute to its LLVM counterpart.
   os << formatv(
-      "static LLVM_ATTRIBUTE_UNUSED {0} convert{1}ToLLVM({2}::{1} value) {{\n",
+      "[[maybe_unused]] static {0} convert{1}ToLLVM({2}::{1} value) {{\n",
       llvmClass, cppClassName, cppNamespace);
   os << "  switch (value) {\n";
 
@@ -444,7 +444,7 @@ static void emitOneCEnumToConversion(const Record *record, raw_ostream &os) {
   StringRef cppNamespace = enumAttr.getCppNamespace();
 
   // Emit the function converting the enum attribute to its LLVM counterpart.
-  os << formatv("static LLVM_ATTRIBUTE_UNUSED int64_t "
+  os << formatv("[[maybe_unused]] static int64_t "
                 "convert{0}ToLLVM({1}::{0} value) {{\n",
                 cppClassName, cppNamespace);
   os << "  switch (value) {\n";
@@ -474,7 +474,7 @@ static void emitOneEnumFromConversion(const Record *record, raw_ostream &os) {
   StringRef cppNamespace = enumInfo.getCppNamespace();
 
   // Emit the function converting the enum attribute from its LLVM counterpart.
-  os << formatv("inline LLVM_ATTRIBUTE_UNUSED {0}::{1} convert{1}FromLLVM({2} "
+  os << formatv("[[maybe_unused]] inline {0}::{1} convert{1}FromLLVM({2} "
                 "value) {{\n",
                 cppNamespace, cppClassName, llvmClass);
   os << "  switch (value) {\n";
@@ -509,10 +509,9 @@ static void emitOneCEnumFromConversion(const Record *record, raw_ostream &os) {
   StringRef cppNamespace = enumInfo.getCppNamespace();
 
   // Emit the function converting the enum attribute from its LLVM counterpart.
-  os << formatv(
-      "inline LLVM_ATTRIBUTE_UNUSED {0}::{1} convert{1}FromLLVM(int64_t "
-      "value) {{\n",
-      cppNamespace, cppClassName);
+  os << formatv("[[maybe_unused]] inline {0}::{1} convert{1}FromLLVM(int64_t "
+                "value) {{\n",
+                cppNamespace, cppClassName);
   os << "  switch (value) {\n";
 
   for (const auto &enumerant : enumInfo.getAllCases()) {
diff --git a/mlir/tools/mlir-tblgen/RewriterGen.cpp b/mlir/tools/mlir-tblgen/RewriterGen.cpp
index 40bc1a9c3868c..c3034bb843c4a 100644
--- a/mlir/tools/mlir-tblgen/RewriterGen.cpp
+++ b/mlir/tools/mlir-tblgen/RewriterGen.cpp
@@ -2120,7 +2120,7 @@ static void emitRewriters(const RecordKeeper &records, raw_ostream &os) {
   }
 
   // Emit function to add the generated matchers to the pattern list.
-  os << "void LLVM_ATTRIBUTE_UNUSED populateWithGenerated("
+  os << "[[maybe_unused]] void populateWithGenerated("
         "::mlir::RewritePatternSet &patterns) {\n";
   for (const auto &name : rewriterNames) {
     os << "  patterns.add<" << name << ">(patterns.getContext());\n";
diff --git a/mlir/unittests/Dialect/SparseTensor/MergerTest.cpp b/mlir/unittests/Dialect/SparseTensor/MergerTest.cpp
index fe26fc1f1d366..2a583059d2e0a 100644
--- a/mlir/unittests/Dialect/SparseTensor/MergerTest.cpp
+++ b/mlir/unittests/Dialect/SparseTensor/MergerTest.cpp
@@ -113,8 +113,7 @@ static Match tensorMatch(TensorId tid) { return Match(tid); }
 static Match synZeroMatch() { return Match(); }
 
 #define IMPL_BINOP_PATTERN(OP, KIND)                                           \
-  LLVM_ATTRIBUTE_UNUSED static Match OP##Match(const Match &e0,                \
-                                               const Match &e1) {              \
+  [[maybe_unused]] static Match OP##Match(const Match &e0, const Match &e1) {  \
     return Match(KIND, e0, e1);                                                \
   }
 FOREVERY_BINOP(IMPL_BINOP_PATTERN)

[mlir] Replace LLVM_ATTRIBUTE_UNUSED with [[maybe_unused]] (NFC)

2956dc9

This patch replaces LLVM_ATTRIBUTE_UNUSED with [[maybe_unused]], introduced as part of C++17.

kazutakahirata requested a review from aartbik as a code owner October 16, 2025 05:38

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llvmbot added mlir:core MLIR Core Infrastructure mlir:llvm mlir:affine mlir:sparse Sparse compiler in MLIR mlir mlir:presburger labels Oct 16, 2025

tgymnich approved these changes Oct 16, 2025

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kuhar approved these changes Oct 16, 2025

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kazutakahirata merged commit 6870f68 into llvm:main Oct 16, 2025
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kazutakahirata deleted the cleanup_20251015_maybe_unused_mlir branch October 16, 2025 14:49

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[mlir] Replace LLVM_ATTRIBUTE_UNUSED with [[maybe_unused]] (NFC) #163703

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