[flang-commits] [flang] [flang][hlfir] Add hlfir.maxval intrinsic (PR #65705)
Yusuke MINATO via flang-commits
flang-commits at lists.llvm.org
Tue Sep 12 00:35:03 PDT 2023
https://github.com/yus3710-fj updated https://github.com/llvm/llvm-project/pull/65705:
>From 39979cc28952ccb3239c02805054e0f01a38ae46 Mon Sep 17 00:00:00 2001
From: Yusuke MINATO <minato.yusuke at fujitsu.com>
Date: Wed, 30 Aug 2023 16:30:38 +0900
Subject: [PATCH] [flang][hlfir] Add hlfir.maxval intrinsic
Adds a new HLFIR operation for the MAXVAL intrinsic according to
the design set out in flang/docs/HighLevelFIR.md.
---
.../include/flang/Optimizer/HLFIR/HLFIROps.td | 27 ++
flang/lib/Lower/HlfirIntrinsics.cpp | 8 +
flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp | 96 +++++++
.../HLFIR/Transforms/LowerHLFIRIntrinsics.cpp | 19 +-
flang/test/HLFIR/invalid.fir | 78 ++++++
flang/test/HLFIR/maxval-lowering.fir | 218 +++++++++++++++
flang/test/HLFIR/maxval.fir | 249 +++++++++++++++++
flang/test/HLFIR/memory-effects.fir | 15 +
flang/test/Lower/HLFIR/maxval.f90 | 262 ++++++++++++++++++
9 files changed, 966 insertions(+), 6 deletions(-)
create mode 100644 flang/test/HLFIR/maxval-lowering.fir
create mode 100644 flang/test/HLFIR/maxval.fir
create mode 100644 flang/test/Lower/HLFIR/maxval.f90
diff --git a/flang/include/flang/Optimizer/HLFIR/HLFIROps.td b/flang/include/flang/Optimizer/HLFIR/HLFIROps.td
index 8aab44f176c0eca..aef3b1d976f16d9 100644
--- a/flang/include/flang/Optimizer/HLFIR/HLFIROps.td
+++ b/flang/include/flang/Optimizer/HLFIR/HLFIROps.td
@@ -404,6 +404,33 @@ def hlfir_CountOp : hlfir_Op<"count", [AttrSizedOperandSegments, DeclareOpInterf
let hasVerifier = 1;
}
+def hlfir_MaxvalOp : hlfir_Op<"maxval", [AttrSizedOperandSegments,
+ DeclareOpInterfaceMethods<ArithFastMathInterface>,
+ DeclareOpInterfaceMethods<MemoryEffectsOpInterface>]> {
+ let summary = "MAXVAL transformational intrinsic";
+ let description = [{
+ Maximum value(s) of an array.
+ If DIM is absent, the result is a scalar.
+ If DIM is present, the result is an array of rank n-1, where n is the rank of ARRAY.
+ }];
+
+ let arguments = (ins
+ AnyFortranArrayObject:$array,
+ Optional<AnyIntegerType>:$dim,
+ Optional<AnyFortranLogicalOrI1ArrayObject>:$mask,
+ DefaultValuedAttr<Arith_FastMathAttr,
+ "::mlir::arith::FastMathFlags::none">:$fastmath
+ );
+
+ let results = (outs AnyFortranValue);
+
+ let assemblyFormat = [{
+ $array (`dim` $dim^)? (`mask` $mask^)? attr-dict `:` functional-type(operands, results)
+ }];
+
+ let hasVerifier = 1;
+}
+
def hlfir_ProductOp : hlfir_Op<"product", [AttrSizedOperandSegments,
DeclareOpInterfaceMethods<ArithFastMathInterface>,
DeclareOpInterfaceMethods<MemoryEffectsOpInterface>]> {
diff --git a/flang/lib/Lower/HlfirIntrinsics.cpp b/flang/lib/Lower/HlfirIntrinsics.cpp
index ab569adaf6f46ff..4d25c59bf79ca6c 100644
--- a/flang/lib/Lower/HlfirIntrinsics.cpp
+++ b/flang/lib/Lower/HlfirIntrinsics.cpp
@@ -88,6 +88,7 @@ class HlfirReductionIntrinsic : public HlfirTransformationalIntrinsic {
};
using HlfirSumLowering = HlfirReductionIntrinsic<hlfir::SumOp, true>;
using HlfirProductLowering = HlfirReductionIntrinsic<hlfir::ProductOp, true>;
+using HlfirMaxvalLowering = HlfirReductionIntrinsic<hlfir::MaxvalOp, true>;
using HlfirAnyLowering = HlfirReductionIntrinsic<hlfir::AnyOp, false>;
using HlfirAllLowering = HlfirReductionIntrinsic<hlfir::AllOp, false>;
@@ -227,6 +228,10 @@ HlfirTransformationalIntrinsic::computeResultType(mlir::Value argArray,
mlir::Type elementType = array.getEleTy();
return hlfir::ExprType::get(builder.getContext(), resultShape, elementType,
/*polymorphic=*/false);
+ } else if (auto resCharType =
+ mlir::dyn_cast<fir::CharacterType>(stmtResultType)) {
+ normalisedResult = hlfir::ExprType::get(
+ builder.getContext(), hlfir::ExprType::Shape{}, resCharType, false);
}
return normalisedResult;
}
@@ -348,6 +353,9 @@ std::optional<hlfir::EntityWithAttributes> Fortran::lower::lowerHlfirIntrinsic(
if (name == "count")
return HlfirCountLowering{builder, loc}.lower(loweredActuals, argLowering,
stmtResultType);
+ if (name == "maxval")
+ return HlfirMaxvalLowering{builder, loc}.lower(loweredActuals, argLowering,
+ stmtResultType);
if (mlir::isa<fir::CharacterType>(stmtResultType)) {
if (name == "min")
return HlfirCharExtremumLowering{builder, loc,
diff --git a/flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp b/flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp
index 5bb954647fb275d..531a40c8dd4f920 100644
--- a/flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp
+++ b/flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp
@@ -749,6 +749,102 @@ void hlfir::ProductOp::getEffects(
getIntrinsicEffects(getOperation(), effects);
}
+//===----------------------------------------------------------------------===//
+// CharacterReductionOp
+//===----------------------------------------------------------------------===//
+
+template <typename CharacterReductionOp>
+static mlir::LogicalResult
+verifyCharacterReductionOp(CharacterReductionOp reductionOp) {
+ mlir::Operation *op = reductionOp->getOperation();
+
+ auto results = op->getResultTypes();
+ assert(results.size() == 1);
+
+ mlir::Value array = reductionOp->getArray();
+ mlir::Value dim = reductionOp->getDim();
+ mlir::Value mask = reductionOp->getMask();
+
+ fir::SequenceType arrayTy =
+ hlfir::getFortranElementOrSequenceType(array.getType())
+ .cast<fir::SequenceType>();
+ mlir::Type numTy = arrayTy.getEleTy();
+ llvm::ArrayRef<int64_t> arrayShape = arrayTy.getShape();
+
+ if (mask) {
+ fir::SequenceType maskSeq =
+ hlfir::getFortranElementOrSequenceType(mask.getType())
+ .dyn_cast<fir::SequenceType>();
+ llvm::ArrayRef<int64_t> maskShape;
+
+ if (maskSeq)
+ maskShape = maskSeq.getShape();
+
+ if (!maskShape.empty()) {
+ if (maskShape.size() != arrayShape.size())
+ return reductionOp->emitWarning("MASK must be conformable to ARRAY");
+ static_assert(fir::SequenceType::getUnknownExtent() ==
+ hlfir::ExprType::getUnknownExtent());
+ constexpr int64_t unknownExtent = fir::SequenceType::getUnknownExtent();
+ for (std::size_t i = 0; i < arrayShape.size(); ++i) {
+ int64_t arrayExtent = arrayShape[i];
+ int64_t maskExtent = maskShape[i];
+ if ((arrayExtent != maskExtent) && (arrayExtent != unknownExtent) &&
+ (maskExtent != unknownExtent))
+ return reductionOp->emitWarning("MASK must be conformable to ARRAY");
+ }
+ }
+ }
+
+ auto resultExpr = results[0].cast<hlfir::ExprType>();
+ mlir::Type resultType = resultExpr.getEleTy();
+ assert(mlir::isa<fir::CharacterType>(resultType) &&
+ "result must be character");
+
+ // Result is of the same type as ARRAY
+ if (resultType != numTy)
+ return reductionOp->emitOpError(
+ "result must have the same element type as ARRAY argument");
+
+ if (arrayShape.size() > 1 && dim != nullptr) {
+ if (!resultExpr.isArray())
+ return reductionOp->emitOpError("result must be an array");
+ llvm::ArrayRef<int64_t> resultShape = resultExpr.getShape();
+ // Result has rank n-1
+ if (resultShape.size() != (arrayShape.size() - 1))
+ return reductionOp->emitOpError(
+ "result rank must be one less than ARRAY");
+ } else if (!resultExpr.isScalar()) {
+ return reductionOp->emitOpError("result must be scalar character");
+ }
+ return mlir::success();
+}
+
+//===----------------------------------------------------------------------===//
+// MaxvalOp
+//===----------------------------------------------------------------------===//
+
+mlir::LogicalResult hlfir::MaxvalOp::verify() {
+ mlir::Operation *op = getOperation();
+
+ auto results = op->getResultTypes();
+ assert(results.size() == 1);
+
+ auto resultExpr = mlir::dyn_cast<hlfir::ExprType>(results[0]);
+ if (resultExpr && mlir::isa<fir::CharacterType>(resultExpr.getEleTy())) {
+ return verifyCharacterReductionOp<hlfir::MaxvalOp *>(this);
+ } else {
+ return verifyNumericalReductionOp<hlfir::MaxvalOp *>(this);
+ }
+}
+
+void hlfir::MaxvalOp::getEffects(
+ llvm::SmallVectorImpl<
+ mlir::SideEffects::EffectInstance<mlir::MemoryEffects::Effect>>
+ &effects) {
+ getIntrinsicEffects(getOperation(), effects);
+}
+
//===----------------------------------------------------------------------===//
// SetLengthOp
//===----------------------------------------------------------------------===//
diff --git a/flang/lib/Optimizer/HLFIR/Transforms/LowerHLFIRIntrinsics.cpp b/flang/lib/Optimizer/HLFIR/Transforms/LowerHLFIRIntrinsics.cpp
index f30d79ebaa9b405..b6045fdef0987c0 100644
--- a/flang/lib/Optimizer/HLFIR/Transforms/LowerHLFIRIntrinsics.cpp
+++ b/flang/lib/Optimizer/HLFIR/Transforms/LowerHLFIRIntrinsics.cpp
@@ -220,6 +220,8 @@ class HlfirReductionIntrinsicConversion : public HlfirIntrinsicConversion<OP> {
opName = "sum";
} else if constexpr (std::is_same_v<OP, hlfir::ProductOp>) {
opName = "product";
+ } else if constexpr (std::is_same_v<OP, hlfir::MaxvalOp>) {
+ opName = "maxval";
} else if constexpr (std::is_same_v<OP, hlfir::AnyOp>) {
opName = "any";
} else if constexpr (std::is_same_v<OP, hlfir::AllOp>) {
@@ -238,7 +240,8 @@ class HlfirReductionIntrinsicConversion : public HlfirIntrinsicConversion<OP> {
llvm::SmallVector<fir::ExtendedValue, 0> args;
if constexpr (std::is_same_v<OP, hlfir::SumOp> ||
- std::is_same_v<OP, hlfir::ProductOp>) {
+ std::is_same_v<OP, hlfir::ProductOp> ||
+ std::is_same_v<OP, hlfir::MaxvalOp>) {
args = buildNumericalArgs(operation, i32, logicalType, rewriter, opName);
} else {
args = buildLogicalArgs(operation, i32, logicalType, rewriter, opName);
@@ -259,6 +262,8 @@ using SumOpConversion = HlfirReductionIntrinsicConversion<hlfir::SumOp>;
using ProductOpConversion = HlfirReductionIntrinsicConversion<hlfir::ProductOp>;
+using MaxvalOpConversion = HlfirReductionIntrinsicConversion<hlfir::MaxvalOp>;
+
using AnyOpConversion = HlfirReductionIntrinsicConversion<hlfir::AnyOp>;
using AllOpConversion = HlfirReductionIntrinsicConversion<hlfir::AllOp>;
@@ -431,17 +436,19 @@ class LowerHLFIRIntrinsics
mlir::ModuleOp module = this->getOperation();
mlir::MLIRContext *context = &getContext();
mlir::RewritePatternSet patterns(context);
- patterns.insert<MatmulOpConversion, MatmulTransposeOpConversion,
- AllOpConversion, AnyOpConversion, SumOpConversion,
- ProductOpConversion, TransposeOpConversion,
- CountOpConversion, DotProductOpConversion>(context);
+ patterns
+ .insert<MatmulOpConversion, MatmulTransposeOpConversion,
+ AllOpConversion, AnyOpConversion, SumOpConversion,
+ ProductOpConversion, TransposeOpConversion, CountOpConversion,
+ DotProductOpConversion, MaxvalOpConversion>(context);
mlir::ConversionTarget target(*context);
target.addLegalDialect<mlir::BuiltinDialect, mlir::arith::ArithDialect,
mlir::func::FuncDialect, fir::FIROpsDialect,
hlfir::hlfirDialect>();
target.addIllegalOp<hlfir::MatmulOp, hlfir::MatmulTransposeOp, hlfir::SumOp,
hlfir::ProductOp, hlfir::TransposeOp, hlfir::AnyOp,
- hlfir::AllOp, hlfir::DotProductOp, hlfir::CountOp>();
+ hlfir::AllOp, hlfir::DotProductOp, hlfir::CountOp,
+ hlfir::MaxvalOp>();
target.markUnknownOpDynamicallyLegal(
[](mlir::Operation *) { return true; });
if (mlir::failed(
diff --git a/flang/test/HLFIR/invalid.fir b/flang/test/HLFIR/invalid.fir
index db16cb29c623880..00fe30988439542 100644
--- a/flang/test/HLFIR/invalid.fir
+++ b/flang/test/HLFIR/invalid.fir
@@ -392,6 +392,84 @@ func.func @bad_count4(%arg0: !hlfir.expr<?x!fir.logical<4>>, %arg1: i32) {
%0 = hlfir.count %arg0 dim %arg1 : (!hlfir.expr<?x!fir.logical<4>>, i32) -> !fir.logical<4>
}
+// -----
+func.func @bad_maxval1(%arg0: !hlfir.expr<?xi32>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+ // expected-error at +1 {{'hlfir.maxval' op result must have the same element type as ARRAY argument}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?xi32>, i32, !fir.box<!fir.logical<4>>) -> f32
+}
+
+// -----
+func.func @bad_maxval2(%arg0: !hlfir.expr<?xi32>, %arg1: i32, %arg2: !fir.box<!fir.array<?x?x?x?x?x!fir.logical<4>>>) {
+ // expected-warning at +1 {{MASK must be conformable to ARRAY}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?xi32>, i32, !fir.box<!fir.array<?x?x?x?x?x!fir.logical<4>>>) -> !hlfir.expr<i32>
+}
+
+// -----
+func.func @bad_maxval3(%arg0: !hlfir.expr<?x5x?xi32>, %arg1: i32, %arg2: !fir.box<!fir.array<2x6x?x!fir.logical<4>>>) {
+ // expected-warning at +1 {{MASK must be conformable to ARRAY}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?x5x?xi32>, i32, !fir.box<!fir.array<2x6x?x!fir.logical<4>>>) -> !hlfir.expr<i32>
+}
+
+// -----
+func.func @bad_maxval4(%arg0: !hlfir.expr<?x?xi32>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+ // expected-error at +1 {{'hlfir.maxval' op result rank must be one less than ARRAY}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?x?xi32>, i32, !fir.box<!fir.logical<4>>) -> !hlfir.expr<?x?xi32>
+}
+
+// -----
+func.func @bad_maxval5(%arg0: !hlfir.expr<?xi32>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+ // expected-error at +1 {{'hlfir.maxval' op result must be of numerical scalar type}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?xi32>, i32, !fir.box<!fir.logical<4>>) -> !fir.logical<4>
+}
+
+// -----
+func.func @bad_maxval6(%arg0: !hlfir.expr<?x?xi32>, %arg1: i32){
+ // expected-error at +1 {{'hlfir.maxval' op result must be an array}}
+ %0 = hlfir.maxval %arg0 dim %arg1 : (!hlfir.expr<?x?xi32>, i32) -> !hlfir.expr<i32>
+}
+
+// -----
+func.func @bad_maxval7(%arg0: !hlfir.expr<?xi32>){
+ // expected-error at +1 {{'hlfir.maxval' op result must be of numerical scalar type}}
+ %0 = hlfir.maxval %arg0 : (!hlfir.expr<?xi32>) -> !hlfir.expr<i32>
+}
+
+// -----
+func.func @bad_maxval8(%arg0: !hlfir.expr<?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+ // expected-error at +1 {{'hlfir.maxval' op result must have the same element type as ARRAY argument}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?x!fir.char<1,?>>, i32, !fir.box<!fir.logical<4>>) -> i32
+}
+
+// -----
+func.func @bad_maxval9(%arg0: !hlfir.expr<?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.array<?x?x?x?x?x!fir.logical<4>>>) {
+ // expected-warning at +1 {{MASK must be conformable to ARRAY}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?x!fir.char<1,?>>, i32, !fir.box<!fir.array<?x?x?x?x?x!fir.logical<4>>>) -> !hlfir.expr<!fir.char<1,?>>
+}
+
+// -----
+func.func @bad_maxval10(%arg0: !hlfir.expr<?x5x?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.array<2x6x?x!fir.logical<4>>>) {
+ // expected-warning at +1 {{MASK must be conformable to ARRAY}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?x5x?x!fir.char<1,?>>, i32, !fir.box<!fir.array<2x6x?x!fir.logical<4>>>) -> !hlfir.expr<!fir.char<1,?>>
+}
+
+// -----
+func.func @bad_maxval11(%arg0: !hlfir.expr<?x?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+ // expected-error at +1 {{'hlfir.maxval' op result rank must be one less than ARRAY}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?x?x!fir.char<1,?>>, i32, !fir.box<!fir.logical<4>>) -> !hlfir.expr<?x?x!fir.char<1,?>>
+}
+
+// -----
+func.func @bad_maxval12(%arg0: !hlfir.expr<?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+ // expected-error at +1 {{'hlfir.maxval' op result must be scalar character}}
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?x!fir.char<1,?>>, i32, !fir.box<!fir.logical<4>>) -> !hlfir.expr<?x!fir.char<1,?>>
+}
+
+// -----
+func.func @bad_maxval13(%arg0: !hlfir.expr<?x?x!fir.char<1,?>>, %arg1: i32){
+ // expected-error at +1 {{'hlfir.maxval' op result must be an array}}
+ %0 = hlfir.maxval %arg0 dim %arg1 : (!hlfir.expr<?x?x!fir.char<1,?>>, i32) -> !hlfir.expr<!fir.char<1,?>>
+}
+
// -----
func.func @bad_product1(%arg0: !hlfir.expr<?xi32>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
// expected-error at +1 {{'hlfir.product' op result must have the same element type as ARRAY argument}}
diff --git a/flang/test/HLFIR/maxval-lowering.fir b/flang/test/HLFIR/maxval-lowering.fir
new file mode 100644
index 000000000000000..3eb36cdef2cbfaf
--- /dev/null
+++ b/flang/test/HLFIR/maxval-lowering.fir
@@ -0,0 +1,218 @@
+// Test hlfir.maxval operation lowering to fir runtime call
+// RUN: fir-opt %s -lower-hlfir-intrinsics | FileCheck %s
+
+// simple one argument maxval
+func.func @_QPmaxval1(%arg0: !fir.box<!fir.array<?xi32>> {fir.bindc_name = "a"}, %arg1: !fir.ref<i32> {fir.bindc_name = "s"}) {
+ %0:2 = hlfir.declare %arg0 {uniq_name = "_QFmaxval1Ea"} : (!fir.box<!fir.array<?xi32>>) -> (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.array<?xi32>>)
+ %1:2 = hlfir.declare %arg1 {uniq_name = "_QFmaxval1Es"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
+ %2 = hlfir.maxval %0#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?xi32>>) -> i32
+ hlfir.assign %2 to %1#0 : i32, !fir.ref<i32>
+ return
+}
+// CHECK-LABEL: func.func @_QPmaxval1(
+// CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?xi32>>
+// CHECK: %[[ARG1:.*]]: !fir.ref<i32>
+// CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+// CHECK-DAG: %[[RES:.*]]:2 = hlfir.declare %[[ARG1]]
+// CHECK-DAG: %[[MASK:.*]] = fir.absent !fir.box<i1>
+// CHECK-DAG: %[[ARRAY_ARG:.*]] = fir.convert %[[ARRAY]]#1 : (!fir.box<!fir.array<?xi32>>) -> !fir.box<none>
+// CHECK-DAG: %[[MASK_ARG:.*]] = fir.convert %[[MASK]] : (!fir.box<i1>) -> !fir.box<none>
+// CHECK: %[[RET:.*]] = fir.call @_FortranAMaxvalInteger4(%[[ARRAY_ARG]], %[[LOC_STR:.*]], %[[LOC_N:.*]], %[[INT:.*]], %[[MASK_ARG]]) fastmath<contract> : (!fir.box<none>, !fir.ref<i8>, i32, i32, !fir.box<none>) -> i32
+// CHECK-NEXT: hlfir.assign %[[RET]] to %[[RES]]#0 : i32, !fir.ref<i32>
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// maxval with a by-ref dimension of index type
+func.func @_QPmaxval2(%arg0: !fir.box<!fir.array<?x?xi32>> {fir.bindc_name = "a"}, %arg1: !fir.box<!fir.array<?xi32>> {fir.bindc_name = "s"}, %arg2: !fir.ref<index> {fir.bindc_name = "d"}) {
+ %0:2 = hlfir.declare %arg0 {uniq_name = "_QFmaxval2Ea"} : (!fir.box<!fir.array<?x?xi32>>) -> (!fir.box<!fir.array<?x?xi32>>, !fir.box<!fir.array<?x?xi32>>)
+ %1:2 = hlfir.declare %arg2 {uniq_name = "_QFmaxval2Ed"} : (!fir.ref<index>) -> (!fir.ref<index>, !fir.ref<index>)
+ %2:2 = hlfir.declare %arg1 {uniq_name = "_QFmaxval2Es"} : (!fir.box<!fir.array<?xi32>>) -> (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.array<?xi32>>)
+ %3 = fir.load %1#0 : !fir.ref<index>
+ %4 = hlfir.maxval %0#0 dim %3#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?x?xi32>>, index) -> !hlfir.expr<?xi32>
+ hlfir.assign %4 to %2#0 : !hlfir.expr<?xi32>, !fir.box<!fir.array<?xi32>>
+ hlfir.destroy %4 : !hlfir.expr<?xi32>
+ return
+}
+// CHECK-LABEL: func.func @_QPmaxval2(
+// CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?x?xi32>>
+// CHECK: %[[ARG1:.*]]: !fir.box<!fir.array<?xi32>>
+// CHECK: %[[ARG2:.*]]: !fir.ref<index>
+// CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+// CHECK-DAG: %[[RES:.*]]:2 = hlfir.declare %[[ARG1]]
+// CHECK-DAG: %[[DIM_VAR:.*]]:2 = hlfir.declare %[[ARG2]]
+
+// CHECK-DAG: %[[RET_BOX:.*]] = fir.alloca !fir.box<!fir.heap<!fir.array<?xi32>>>
+// CHECK-DAG: %[[RET_ADDR:.*]] = fir.zero_bits !fir.heap<!fir.array<?xi32>>
+// CHECK-DAG: %[[C0:.*]] = arith.constant 0 : index
+// CHECK-DAG: %[[RET_SHAPE:.*]] = fir.shape %[[C0]] : (index) -> !fir.shape<1>
+// CHECK-DAG: %[[RET_EMBOX:.*]] = fir.embox %[[RET_ADDR]](%[[RET_SHAPE]])
+// CHECK-DAG: fir.store %[[RET_EMBOX]] to %[[RET_BOX]]
+
+// CHECK-DAG: %[[MASK:.*]] = fir.absent !fir.box<i1>
+// CHECK-DAG: %[[DIM_IDX:.*]] = fir.load %[[DIM_VAR]]#0 : !fir.ref<index>
+// CHECK-DAG: %[[DIM:.*]] = fir.convert %[[DIM_IDX]] : (index) -> i32
+
+// CHECK-DAG: %[[RET_ARG:.*]] = fir.convert %[[RET_BOX]]
+// CHECK-DAG: %[[ARRAY_ARG:.*]] = fir.convert %[[ARRAY]]#1 : (!fir.box<!fir.array<?x?xi32>>) -> !fir.box<none>
+// CHECK-DAG: %[[MASK_ARG:.*]] = fir.convert %[[MASK]] : (!fir.box<i1>) -> !fir.box<none>
+// CHECK: %[[NONE:.*]] = fir.call @_FortranAMaxvalDim(%[[RET_ARG]], %[[ARRAY_ARG]], %[[DIM]], %[[LOC_STR:.*]], %[[LOC_N:.*]], %[[MASK_ARG]]) fastmath<contract> : (!fir.ref<!fir.box<none>>, !fir.box<none>, i32, !fir.ref<i8>, i32, !fir.box<none>) -> none
+
+// CHECK: %[[RET:.*]] = fir.load %[[RET_BOX]]
+// CHECK: %[[BOX_DIMS:.*]]:3 = fir.box_dims %[[RET]]
+// CHECK-NEXT: %[[ADDR:.*]] = fir.box_addr %[[RET]]
+// CHECK-NEXT: %[[SHIFT:.*]] = fir.shape_shift %[[BOX_DIMS]]#0, %[[BOX_DIMS]]#1
+// TODO: fix alias analysis in hlfir.assign bufferization
+// CHECK-NEXT: %[[TMP:.*]]:2 = hlfir.declare %[[ADDR]](%[[SHIFT]]) {uniq_name = ".tmp.intrinsic_result"}
+// CHECK: %[[TRUE:.*]] = arith.constant true
+// CHECK: %[[ASEXPR:.*]] = hlfir.as_expr %[[TMP]]#0 move %[[TRUE]] : (!fir.box<!fir.array<?xi32>>, i1) -> !hlfir.expr<?xi32>
+// CHECK: hlfir.assign %[[ASEXPR]] to %[[RES]]#0
+// CHECK: hlfir.destroy %[[ASEXPR]]
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// maxval with scalar mask
+func.func @_QPmaxval3(%arg0: !fir.box<!fir.array<?xi32>> {fir.bindc_name = "a"}, %arg1: !fir.ref<i32> {fir.bindc_name = "s"}, %arg2: !fir.ref<!fir.logical<4>> {fir.bindc_name = "m"}) {
+ %0:2 = hlfir.declare %arg0 {uniq_name = "_QFmaxval3Ea"} : (!fir.box<!fir.array<?xi32>>) -> (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.array<?xi32>>)
+ %1:2 = hlfir.declare %arg2 {uniq_name = "_QFmaxval3Em"} : (!fir.ref<!fir.logical<4>>) -> (!fir.ref<!fir.logical<4>>, !fir.ref<!fir.logical<4>>)
+ %2:2 = hlfir.declare %arg1 {uniq_name = "_QFmaxval3Es"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
+ %3 = hlfir.maxval %0#0 mask %1#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?xi32>>, !fir.ref<!fir.logical<4>>) -> i32
+ hlfir.assign %3 to %2#0 : i32, !fir.ref<i32>
+ return
+}
+// CHECK-LABEL: func.func @_QPmaxval3(
+// CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?xi32>>
+// CHECK: %[[ARG1:.*]]: !fir.ref<i32>
+// CHECK: %[[ARG2:.*]]: !fir.ref<!fir.logical<4>>
+// CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+// CHECK-DAG: %[[RES:.*]]:2 = hlfir.declare %[[ARG1]]
+// CHECK-DAG: %[[MASK:.*]]:2 = hlfir.declare %[[ARG2]]
+// CHECK-DAG: %[[MASK_BOX:.*]] = fir.embox %[[MASK]]#1 : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+// CHECK-DAG: %[[ARRAY_ARG:.*]] = fir.convert %[[ARRAY]]#1 : (!fir.box<!fir.array<?xi32>>) -> !fir.box<none>
+// CHECK-DAG: %[[MASK_ARG:.*]] = fir.convert %[[MASK_BOX]] : (!fir.box<!fir.logical<4>>) -> !fir.box<none>
+// CHECK: %[[RET:.*]] = fir.call @_FortranAMaxvalInteger4(%[[ARRAY_ARG]], %[[LOC_STR:.*]], %[[LOC_N:.*]], %[[INT:.*]], %[[MASK_ARG]]) fastmath<contract> : (!fir.box<none>, !fir.ref<i8>, i32, i32, !fir.box<none>) -> i32
+// CHECK-NEXT: hlfir.assign %[[RET]] to %[[RES]]#0 : i32, !fir.ref<i32>
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// maxval with array mask
+func.func @_QPmaxval4(%arg0: !fir.box<!fir.array<?xi32>> {fir.bindc_name = "a"}, %arg1: !fir.ref<i32> {fir.bindc_name = "s"}, %arg2: !fir.box<!fir.array<?x!fir.logical<4>>> {fir.bindc_name = "m"}) {
+ %0:2 = hlfir.declare %arg0 {uniq_name = "_QFmaxval4Ea"} : (!fir.box<!fir.array<?xi32>>) -> (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.array<?xi32>>)
+ %1:2 = hlfir.declare %arg2 {uniq_name = "_QFmaxval4Em"} : (!fir.box<!fir.array<?x!fir.logical<4>>>) -> (!fir.box<!fir.array<?x!fir.logical<4>>>, !fir.box<!fir.array<?x!fir.logical<4>>>)
+ %2:2 = hlfir.declare %arg1 {uniq_name = "_QFmaxval4Es"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
+ %3 = hlfir.maxval %0#0 mask %1#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.array<?x!fir.logical<4>>>) -> i32
+ hlfir.assign %3 to %2#0 : i32, !fir.ref<i32>
+ return
+}
+// CHECK-LABEL: func.func @_QPmaxval4(
+// CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?xi32>>
+// CHECK: %[[ARG1:.*]]: !fir.ref<i32>
+// CHECK: %[[ARG2:.*]]: !fir.box<!fir.array<?x!fir.logical<4>>>
+// CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+// CHECK-DAG: %[[RES:.*]]:2 = hlfir.declare %[[ARG1]]
+// CHECK-DAG: %[[MASK:.*]]:2 = hlfir.declare %[[ARG2]]
+// CHECK-DAG: %[[ARRAY_ARG:.*]] = fir.convert %[[ARRAY]]#1 : (!fir.box<!fir.array<?xi32>>) -> !fir.box<none>
+// CHECK-DAG: %[[MASK_ARG:.*]] = fir.convert %[[MASK]]#1 : (!fir.box<!fir.array<?x!fir.logical<4>>>) -> !fir.box<none>
+// CHECK: %[[RET:.*]] = fir.call @_FortranAMaxvalInteger4(%[[ARRAY_ARG]], %[[LOC_STR:.*]], %[[LOC_N:.*]], %[[INT:.*]], %[[MASK_ARG]]) fastmath<contract> : (!fir.box<none>, !fir.ref<i8>, i32, i32, !fir.box<none>) -> i32
+// CHECK-NEXT: hlfir.assign %[[RET]] to %[[RES]]#0 : i32, !fir.ref<i32>
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+fir.global internal @_QFmaxval5Ea : !fir.array<2x2xi32> {
+ %0 = fir.undefined !fir.array<2x2xi32>
+ %c1_i32 = arith.constant 1 : i32
+ %1 = fir.insert_value %0, %c1_i32, [0 : index, 0 : index] : (!fir.array<2x2xi32>, i32) -> !fir.array<2x2xi32>
+ %c2_i32 = arith.constant 2 : i32
+ %2 = fir.insert_value %1, %c2_i32, [1 : index, 0 : index] : (!fir.array<2x2xi32>, i32) -> !fir.array<2x2xi32>
+ %c3_i32 = arith.constant 3 : i32
+ %3 = fir.insert_value %2, %c3_i32, [0 : index, 1 : index] : (!fir.array<2x2xi32>, i32) -> !fir.array<2x2xi32>
+ %c4_i32 = arith.constant 4 : i32
+ %4 = fir.insert_value %3, %c4_i32, [1 : index, 1 : index] : (!fir.array<2x2xi32>, i32) -> !fir.array<2x2xi32>
+ %c2 = arith.constant 2 : index
+ %c2_0 = arith.constant 2 : index
+ fir.has_value %4 : !fir.array<2x2xi32>
+}
+
+// 3 argument maxval, using local variables
+func.func @_QPmaxval5(%arg0: !fir.ref<!fir.array<2xi32>> {fir.bindc_name = "s"}) {
+ %0 = fir.address_of(@_QFmaxval5Ea) : !fir.ref<!fir.array<2x2xi32>>
+ %c2 = arith.constant 2 : index
+ %c2_0 = arith.constant 2 : index
+ %1 = fir.shape %c2, %c2_0 : (index, index) -> !fir.shape<2>
+ %2:2 = hlfir.declare %0(%1) {uniq_name = "_QFmaxval5Ea"} : (!fir.ref<!fir.array<2x2xi32>>, !fir.shape<2>) -> (!fir.ref<!fir.array<2x2xi32>>, !fir.ref<!fir.array<2x2xi32>>)
+ %c2_1 = arith.constant 2 : index
+ %3 = fir.shape %c2_1 : (index) -> !fir.shape<1>
+ %4:2 = hlfir.declare %arg0(%3) {uniq_name = "_QFmaxval5Es"} : (!fir.ref<!fir.array<2xi32>>, !fir.shape<1>) -> (!fir.ref<!fir.array<2xi32>>, !fir.ref<!fir.array<2xi32>>)
+ %c1_i32 = arith.constant 1 : i32
+ %true = arith.constant true
+ %5 = hlfir.maxval %2#0 dim %c1_i32 mask %true {fastmath = #arith.fastmath<contract>} : (!fir.ref<!fir.array<2x2xi32>>, i32, i1) -> !hlfir.expr<2xi32>
+ hlfir.assign %5 to %4#0 : !hlfir.expr<2xi32>, !fir.ref<!fir.array<2xi32>>
+ hlfir.destroy %5 : !hlfir.expr<2xi32>
+ return
+}
+// CHECK-LABEL: func.func @_QPmaxval5(
+// CHECK: %[[ARG0:.*]]: !fir.ref<!fir.array<2xi32>>
+// CHECK-DAG: %[[RET_BOX:.*]] = fir.alloca !fir.box<!fir.heap<!fir.array<?xi32>>>
+// CHECK-DAG: %[[RET_ADDR:.*]] = fir.zero_bits !fir.heap<!fir.array<?xi32>>
+// CHECK-DAG: %[[C0:.*]] = arith.constant 0 : index
+// CHECK-DAG: %[[RET_SHAPE:.*]] = fir.shape %[[C0]] : (index) -> !fir.shape<1>
+// CHECK-DAG: %[[RET_EMBOX:.*]] = fir.embox %[[RET_ADDR]](%[[RET_SHAPE]])
+// CHECK-DAG: fir.store %[[RET_EMBOX]] to %[[RET_BOX]]
+
+// CHECK-DAG: %[[RES_VAR:.*]] = hlfir.declare %[[ARG0]](%[[RES_SHAPE:.*]])
+
+// CHECK-DAG: %[[MASK_ALLOC:.*]] = fir.alloca !fir.logical<4>
+// CHECK-DAG: %[[TRUE:.*]] = arith.constant true
+// CHECK-DAG: %[[MASK_VAL:.*]] = fir.convert %[[TRUE]] : (i1) -> !fir.logical<4>
+// CHECK-DAG: fir.store %[[MASK_VAL]] to %[[MASK_ALLOC]] : !fir.ref<!fir.logical<4>>
+// CHECK-DAG: %[[MASK_BOX:.*]] = fir.embox %[[MASK_ALLOC]]
+
+// CHECK-DAG: %[[ARRAY_ADDR:.*]] = fir.address_of
+// CHECK-DAG: %[[ARRAY_VAR:.*]]:2 = hlfir.declare %[[ARRAY_ADDR]](%[[ARRAY_SHAPE:.*]])
+// CHECK-DAG: %[[ARRAY_BOX:.*]] = fir.embox %[[ARRAY_VAR]]#1(%[[ARRAY_SHAPE:.*]])
+
+// CHECK-DAG: %[[DIM:.*]] = arith.constant 1 : i32
+
+// CHECK-DAG: %[[RET_ARG:.*]] = fir.convert %[[RET_BOX]]
+// CHECK-DAG: %[[ARRAY_ARG:.*]] = fir.convert %[[ARRAY_BOX]] : (!fir.box<!fir.array<2x2xi32>>) -> !fir.box<none>
+// CHECK-DAG: %[[MASK_ARG:.*]] = fir.convert %[[MASK_BOX]] : (!fir.box<!fir.logical<4>>) -> !fir.box<none>
+// CHECK: %[[NONE:.*]] = fir.call @_FortranAMaxvalDim(%[[RET_ARG]], %[[ARRAY_ARG]], %[[DIM]], %[[LOC_STR:.*]], %[[LOC_N:.*]], %[[MASK_ARG]]) fastmath<contract> : (!fir.ref<!fir.box<none>>, !fir.box<none>, i32, !fir.ref<i8>, i32, !fir.box<none>) -> none
+
+// simple one argument maxval for character
+func.func @_QPmaxval6(%arg0: !fir.box<!fir.array<?x!fir.char<1,?>>> {fir.bindc_name = "a"}, %arg1: !fir.boxchar<1> {fir.bindc_name = "s"}) {
+ %0:2 = hlfir.declare %arg0 {uniq_name = "_QFmaxval6Ea"} : (!fir.box<!fir.array<?x!fir.char<1,?>>>) -> (!fir.box<!fir.array<?x!fir.char<1,?>>>, !fir.box<!fir.array<?x!fir.char<1,?>>>)
+ %1:2 = fir.unboxchar %arg1 : (!fir.boxchar<1>) -> (!fir.ref<!fir.char<1,?>>, index)
+ %2:2 = hlfir.declare %1#0 typeparams %1#1 {uniq_name = "_QFmaxval6Es"} : (!fir.ref<!fir.char<1,?>>, index) -> (!fir.boxchar<1>, !fir.ref<!fir.char<1,?>>)
+ %3 = hlfir.maxval %0#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?x!fir.char<1,?>>>) -> !hlfir.expr<!fir.char<1,?>>
+ hlfir.assign %3 to %2#0 : !hlfir.expr<!fir.char<1,?>>, !fir.boxchar<1>
+ hlfir.destroy %3 : !hlfir.expr<!fir.char<1,?>>
+ return
+}
+// CHECK-LABEL: func.func @_QPmaxval6(
+// CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?x!fir.char<1,?>>>
+// CHECK: %[[ARG1:.*]]: !fir.boxchar<1>
+// CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+// CHECK-DAG: %[[UNBOXED:.*]]:2 = fir.unboxchar %[[ARG1]]
+// CHECK-DAG: %[[RES:.*]]:2 = hlfir.declare %[[UNBOXED]]#0 typeparams %[[UNBOXED]]#1
+
+// CHECK-DAG: %[[MASK:.*]] = fir.absent !fir.box<i1>
+// CHECK-DAG: %[[RET_BOX:.*]] = fir.alloca !fir.box<!fir.heap<!fir.char<1,?>>>
+// CHECK-DAG: %[[RET_ADDR:.*]] = fir.zero_bits !fir.heap<!fir.char<1,?>>
+// CHECK-DAG: %[[C0:.*]] = arith.constant 0 : index
+// CHECK-DAG: %[[RET_EMBOX:.*]] = fir.embox %[[RET_ADDR]] typeparams %[[C0]]
+// CHECK-DAG: fir.store %[[RET_EMBOX]] to %[[RET_BOX]]
+
+// CHECK-DAG: %[[RET_ARG:.*]] = fir.convert %[[RET_BOX]]
+// CHECK-DAG: %[[ARRAY_ARG:.*]] = fir.convert %[[ARRAY]]#1 : (!fir.box<!fir.array<?x!fir.char<1,?>>>) -> !fir.box<none>
+// CHECK-DAG: %[[MASK_ARG:.*]] = fir.convert %[[MASK]] : (!fir.box<i1>) -> !fir.box<none>
+// CHECK: %[[NONE:.*]] = fir.call @_FortranAMaxvalCharacter(%[[RET_ARG]], %[[ARRAY_ARG]], %[[LOC_STR:.*]], %[[LOC_N:.*]], %[[MASK_ARG]]) fastmath<contract> : (!fir.ref<!fir.box<none>>, !fir.box<none>, !fir.ref<i8>, i32, !fir.box<none>) -> none
+
+// CHECK: %[[RET:.*]] = fir.load %[[RET_BOX]]
+// CHECK: %[[BOX_ELESIZE:.*]] = fir.box_elesize %[[RET]]
+// CHECK-NEXT: %[[ADDR:.*]] = fir.box_addr %[[RET]]
+// CHECK-NEXT: %[[TMP:.*]]:2 = hlfir.declare %[[ADDR]] typeparams %[[BOX_ELESIZE]] {uniq_name = ".tmp.intrinsic_result"}
+// CHECK: %[[TRUE:.*]] = arith.constant true
+// CHECK: %[[ASEXPR:.*]] = hlfir.as_expr %[[TMP]]#0 move %[[TRUE]] : (!fir.boxchar<1>, i1) -> !hlfir.expr<!fir.char<1,?>>
+// CHECK: hlfir.assign %[[ASEXPR]] to %[[RES]]#0
+// CHECK: hlfir.destroy %[[ASEXPR]]
+// CHECK-NEXT: return
+// CHECK-NEXT: }
diff --git a/flang/test/HLFIR/maxval.fir b/flang/test/HLFIR/maxval.fir
new file mode 100644
index 000000000000000..01252d390f201a5
--- /dev/null
+++ b/flang/test/HLFIR/maxval.fir
@@ -0,0 +1,249 @@
+// Test hlfir.maxval operation parse, verify (no errors), and unparse
+
+// RUN: fir-opt %s | fir-opt | FileCheck %s
+
+// array is an expression of known shape
+func.func @maxval0(%arg0: !hlfir.expr<42xi32>) {
+ %mask = fir.alloca !fir.logical<4>
+ %c_1 = arith.constant 1 : index
+ %true = arith.constant true
+ %true_logical = fir.convert %true : (i1) -> !fir.logical<4>
+ fir.store %true_logical to %mask : !fir.ref<!fir.logical<4>>
+ %mask_box = fir.embox %mask : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+ %0 = hlfir.maxval %arg0 dim %c_1 mask %mask_box : (!hlfir.expr<42xi32>, index, !fir.box<!fir.logical<4>>) -> i32
+ return
+}
+// CHECK: func.func @maxval0(%[[ARRAY:.*]]: !hlfir.expr<42xi32>) {
+// CHECK-NEXT: %[[MASK:.*]] = fir.alloca !fir.logical<4>
+// CHECK-NEXT: %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT: %[[TRUE:.*]] = arith.constant true
+// CHECK-NEXT: %[[LOGICAL:.*]] = fir.convert %[[TRUE]] : (i1) -> !fir.logical<4>
+// CHECK-NEXT: fir.store %[[LOGICAL]] to %[[MASK]] : !fir.ref<!fir.logical<4>>
+// CHECK-NEXT: %[[BOX:.*]] = fir.embox %0 : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+// CHECK-NEXT: hlfir.maxval %[[ARRAY]] dim %[[C1]] mask %[[BOX]] : (!hlfir.expr<42xi32>, index, !fir.box<!fir.logical<4>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// array is an expression of assumed shape
+func.func @maxval1(%arg0: !hlfir.expr<?xi32>) {
+ %mask = fir.alloca !fir.logical<4>
+ %c_1 = arith.constant 1 : index
+ %true = arith.constant true
+ %true_logical = fir.convert %true : (i1) -> !fir.logical<4>
+ fir.store %true_logical to %mask : !fir.ref<!fir.logical<4>>
+ %mask_box = fir.embox %mask : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+ %0 = hlfir.maxval %arg0 dim %c_1 mask %mask_box : (!hlfir.expr<?xi32>, index, !fir.box<!fir.logical<4>>) -> i32
+ return
+}
+// CHECK: func.func @maxval1(%[[ARRAY:.*]]: !hlfir.expr<?xi32>) {
+// CHECK-NEXT: %[[MASK:.*]] = fir.alloca !fir.logical<4>
+// CHECK-NEXT: %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT: %[[TRUE:.*]] = arith.constant true
+// CHECK-NEXT: %[[LOGICAL:.*]] = fir.convert %[[TRUE]] : (i1) -> !fir.logical<4>
+// CHECK-NEXT: fir.store %[[LOGICAL:.*]] to %[[MASK:.*]] : !fir.ref<!fir.logical<4>>
+// CHECK-NEXT: %[[BOX:.*]] = fir.embox %[[MASK:.*]] : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+// CHECK-NEXT: hlfir.maxval %[[ARRAY:.*]] dim %[[C1]] mask %[[BOX]] : (!hlfir.expr<?xi32>, index, !fir.box<!fir.logical<4>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// boxed array
+func.func @maxval2(%arg0: !fir.box<!fir.array<42xi32>>) {
+ %mask = fir.alloca !fir.logical<4>
+ %c_1 = arith.constant 1 : index
+ %true = arith.constant true
+ %true_logical = fir.convert %true : (i1) -> !fir.logical<4>
+ fir.store %true_logical to %mask : !fir.ref<!fir.logical<4>>
+ %mask_box = fir.embox %mask : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+ %0 = hlfir.maxval %arg0 dim %c_1 mask %mask_box : (!fir.box<!fir.array<42xi32>>, index, !fir.box<!fir.logical<4>>) -> i32
+ return
+}
+// CHECK: func.func @maxval2(%[[ARRAY:.*]]: !fir.box<!fir.array<42xi32>>) {
+// CHECK-NEXT: %[[MASK:.*]] = fir.alloca !fir.logical<4>
+// CHECK-NEXT: %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT: %[[TRUE:.*]] = arith.constant true
+// CHECK-NEXT: %[[LOGICAL:.*]] = fir.convert %[[TRUE]] : (i1) -> !fir.logical<4>
+// CHECK-NEXT: fir.store %[[LOGICAL:.*]] to %[[MASK:.*]] : !fir.ref<!fir.logical<4>>
+// CHECK-NEXT: %[[BOX:.*]] = fir.embox %[[MASK:.*]] : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+// CHECK-NEXT: hlfir.maxval %[[ARRAY:.*]] dim %[[C1]] mask %[[BOX]] : (!fir.box<!fir.array<42xi32>>, index, !fir.box<!fir.logical<4>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// assumed shape boxed array
+func.func @maxval3(%arg0: !fir.box<!fir.array<?xi32>>) {
+ %mask = fir.alloca !fir.logical<4>
+ %c_1 = arith.constant 1 : index
+ %true = arith.constant true
+ %true_logical = fir.convert %true : (i1) -> !fir.logical<4>
+ fir.store %true_logical to %mask : !fir.ref<!fir.logical<4>>
+ %mask_box = fir.embox %mask : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+ %0 = hlfir.maxval %arg0 dim %c_1 mask %mask_box : (!fir.box<!fir.array<?xi32>>, index, !fir.box<!fir.logical<4>>) -> i32
+ return
+}
+// CHECK: func.func @maxval3(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>) {
+// CHECK-NEXT: %[[MASK:.*]] = fir.alloca !fir.logical<4>
+// CHECK-NEXT: %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT: %[[TRUE:.*]] = arith.constant true
+// CHECK-NEXT: %[[LOGICAL:.*]] = fir.convert %[[TRUE]] : (i1) -> !fir.logical<4>
+// CHECK-NEXT: fir.store %[[LOGICAL:.*]] to %[[MASK:.*]] : !fir.ref<!fir.logical<4>>
+// CHECK-NEXT: %[[BOX:.*]] = fir.embox %[[MASK:.*]] : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+// CHECK-NEXT: hlfir.maxval %[[ARRAY:.*]] dim %[[C1]] mask %[[BOX]] : (!fir.box<!fir.array<?xi32>>, index, !fir.box<!fir.logical<4>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// known shape expr mask
+func.func @maxval4(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !hlfir.expr<42x!fir.logical<4>>) {
+ %c_1 = arith.constant 1 : index
+ %0 = hlfir.maxval %arg0 dim %c_1 mask %arg1 : (!fir.box<!fir.array<?xi32>>, index, !hlfir.expr<42x!fir.logical<4>>) -> i32
+ return
+}
+// CHECK: func.func @maxval4(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !hlfir.expr<42x!fir.logical<4>>) {
+// CHECK-NEXT: %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT: hlfir.maxval %[[ARRAY]] dim %[[C1]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, index, !hlfir.expr<42x!fir.logical<4>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// assumed shape expr mask
+func.func @maxval5(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !hlfir.expr<?x!fir.logical<4>>) {
+ %c_1 = arith.constant 1 : index
+ %0 = hlfir.maxval %arg0 dim %c_1 mask %arg1 : (!fir.box<!fir.array<?xi32>>, index, !hlfir.expr<?x!fir.logical<4>>) -> i32
+ return
+}
+// CHECK: func.func @maxval5(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !hlfir.expr<?x!fir.logical<4>>) {
+// CHECK-NEXT: %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT: hlfir.maxval %[[ARRAY]] dim %[[C1]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, index, !hlfir.expr<?x!fir.logical<4>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// known shape array mask
+func.func @maxval6(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !fir.box<!fir.array<42x!fir.logical<4>>>) {
+ %c_1 = arith.constant 1 : index
+ %0 = hlfir.maxval %arg0 dim %c_1 mask %arg1 : (!fir.box<!fir.array<?xi32>>, index, !fir.box<!fir.array<42x!fir.logical<4>>>) -> i32
+ return
+}
+// CHECK: func.func @maxval6(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !fir.box<!fir.array<42x!fir.logical<4>>>) {
+// CHECK-NEXT: %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT: hlfir.maxval %[[ARRAY]] dim %[[C1]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, index, !fir.box<!fir.array<42x!fir.logical<4>>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// assumed shape array mask
+func.func @maxval7(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !fir.box<!fir.array<?x!fir.logical<4>>>) {
+ %c_1 = arith.constant 1 : index
+ %0 = hlfir.maxval %arg0 dim %c_1 mask %arg1 : (!fir.box<!fir.array<?xi32>>, index, !fir.box<!fir.array<?x!fir.logical<4>>>) -> i32
+ return
+}
+// CHECK: func.func @maxval7(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !fir.box<!fir.array<?x!fir.logical<4>>>) {
+// CHECK-NEXT: %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT: hlfir.maxval %[[ARRAY]] dim %[[C1]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, index, !fir.box<!fir.array<?x!fir.logical<4>>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// known shape expr return
+func.func @maxval8(%arg0: !fir.box<!fir.array<2x2xi32>>, %arg1: i32) {
+ %mask = fir.alloca !fir.logical<4>
+ %true = arith.constant true
+ %true_logical = fir.convert %true : (i1) -> !fir.logical<4>
+ fir.store %true_logical to %mask : !fir.ref<!fir.logical<4>>
+ %mask_box = fir.embox %mask : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %mask_box : (!fir.box<!fir.array<2x2xi32>>, i32, !fir.box<!fir.logical<4>>) -> !hlfir.expr<2xi32>
+ return
+}
+// CHECK: func.func @maxval8(%[[ARRAY:.*]]: !fir.box<!fir.array<2x2xi32>>, %[[DIM:.*]]: i32) {
+// CHECK-NEXT: %[[MASK:.*]] = fir.alloca !fir.logical<4>
+// CHECK-NEXT: %[[TRUE:.*]] = arith.constant true
+// CHECK-NEXT: %[[LOGICAL:.*]] = fir.convert %[[TRUE]] : (i1) -> !fir.logical<4>
+// CHECK-NEXT: fir.store %[[LOGICAL]] to %[[MASK]] : !fir.ref<!fir.logical<4>>
+// CHECK-NEXT: %[[BOX:.*]] = fir.embox %0 : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+// CHECK-NEXT: hlfir.maxval %[[ARRAY]] dim %[[DIM]] mask %[[BOX]] : (!fir.box<!fir.array<2x2xi32>>, i32, !fir.box<!fir.logical<4>>) -> !hlfir.expr<2xi32>
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// assumed shape expr return
+func.func @maxval9(%arg0: !fir.box<!fir.array<?x?xi32>>, %arg1: i32) {
+ %mask = fir.alloca !fir.logical<4>
+ %true = arith.constant true
+ %true_logical = fir.convert %true : (i1) -> !fir.logical<4>
+ fir.store %true_logical to %mask : !fir.ref<!fir.logical<4>>
+ %mask_box = fir.embox %mask : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+ %0 = hlfir.maxval %arg0 dim %arg1 mask %mask_box : (!fir.box<!fir.array<?x?xi32>>, i32, !fir.box<!fir.logical<4>>) -> !hlfir.expr<?xi32>
+ return
+}
+// CHECK: func.func @maxval9(%[[ARRAY:.*]]: !fir.box<!fir.array<?x?xi32>>, %[[DIM:.*]]: i32) {
+// CHECK-NEXT: %[[MASK:.*]] = fir.alloca !fir.logical<4>
+// CHECK-NEXT: %[[TRUE:.*]] = arith.constant true
+// CHECK-NEXT: %[[LOGICAL:.*]] = fir.convert %[[TRUE]] : (i1) -> !fir.logical<4>
+// CHECK-NEXT: fir.store %[[LOGICAL]] to %[[MASK]] : !fir.ref<!fir.logical<4>>
+// CHECK-NEXT: %[[BOX:.*]] = fir.embox %0 : (!fir.ref<!fir.logical<4>>) -> !fir.box<!fir.logical<4>>
+// CHECK-NEXT: hlfir.maxval %[[ARRAY]] dim %[[DIM]] mask %[[BOX]] : (!fir.box<!fir.array<?x?xi32>>, i32, !fir.box<!fir.logical<4>>) -> !hlfir.expr<?xi32>
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// hlfir.maxval with only an array argument
+func.func @maxval10(%arg0: !fir.box<!fir.array<?x?xi32>>) {
+ %maxval = hlfir.maxval %arg0 : (!fir.box<!fir.array<?x?xi32>>) -> i32
+ return
+}
+// CHECK: func.func @maxval10(%[[ARRAY:.*]]: !fir.box<!fir.array<?x?xi32>>
+// CHECK-NEXT: %[[maxval:.*]] = hlfir.maxval %[[ARRAY]] : (!fir.box<!fir.array<?x?xi32>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// hlfir.maxval with only a character array argument
+func.func @maxval11(%arg0: !fir.box<!fir.array<?x?x!fir.char<1,?>>>) {
+ %maxval = hlfir.maxval %arg0 : (!fir.box<!fir.array<?x?x!fir.char<1,?>>>) -> !hlfir.expr<!fir.char<1,?>>
+ return
+}
+// CHECK: func.func @maxval11(%[[ARRAY:.*]]: !fir.box<!fir.array<?x?x!fir.char<1,?>>>
+// CHECK-NEXT: %[[maxval:.*]] = hlfir.maxval %[[ARRAY]] : (!fir.box<!fir.array<?x?x!fir.char<1,?>>>) -> !hlfir.expr<!fir.char<1,?>>
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// hlfir.maxval with array and dim argument
+func.func @maxval12(%arg0: !fir.box<!fir.array<?x?xi32>>, %arg1: i32) {
+ %maxval = hlfir.maxval %arg0 dim %arg1 : (!fir.box<!fir.array<?x?xi32>>, i32) -> !hlfir.expr<?xi32>
+ return
+}
+// CHECK: func.func @maxval12(%[[ARRAY:.*]]: !fir.box<!fir.array<?x?xi32>>, %[[DIM:.*]]: i32
+// CHECK-NEXT: %[[maxval:.*]] = hlfir.maxval %[[ARRAY]] dim %[[DIM]] : (!fir.box<!fir.array<?x?xi32>>, i32) -> !hlfir.expr<?xi32>
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// hlfir.maxval with array and mask argument
+func.func @maxval13(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !fir.logical<4>) {
+ %maxval = hlfir.maxval %arg0 mask %arg1 : (!fir.box<!fir.array<?xi32>>, !fir.logical<4>) -> i32
+ return
+}
+// CHECK: func.func @maxval13(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !fir.logical<4>
+// CHECK-NEXT: %[[maxval:.*]] = hlfir.maxval %[[ARRAY]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, !fir.logical<4>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// hlfir.maxval with dim argument with an unusual type
+func.func @maxval14(%arg0: !fir.box<!fir.array<?x?xi32>>, %arg1: index) {
+ %maxval = hlfir.maxval %arg0 dim %arg1 : (!fir.box<!fir.array<?x?xi32>>, index) -> !hlfir.expr<?xi32>
+ return
+}
+// CHECK: func.func @maxval14(%[[ARRAY:.*]]: !fir.box<!fir.array<?x?xi32>>, %[[DIM:.*]]: index
+// CHECK-NEXT: %[[maxval:.*]] = hlfir.maxval %[[ARRAY]] dim %[[DIM]] : (!fir.box<!fir.array<?x?xi32>>, index) -> !hlfir.expr<?xi32>
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// hlfir.maxval with mask argument of unusual type
+func.func @maxval15(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: i1) {
+ %maxval = hlfir.maxval %arg0 mask %arg1 : (!fir.box<!fir.array<?xi32>>, i1) -> i32
+ return
+}
+// CHECK: func.func @maxval15(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: i1
+// CHECK-NEXT: %[[maxval:.*]] = hlfir.maxval %[[ARRAY]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, i1) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
+
+// hlfir.maxval with mask argument of ref<array<>> type
+func.func @maxval16(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !fir.ref<!fir.array<?x!fir.logical<4>>>) {
+ %maxval = hlfir.maxval %arg0 mask %arg1 : (!fir.box<!fir.array<?xi32>>, !fir.ref<!fir.array<?x!fir.logical<4>>>) -> i32
+ return
+}
+// CHECK: func.func @maxval16(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !fir.ref<!fir.array<?x!fir.logical<4>>>
+// CHECK-NEXT: %[[maxval:.*]] = hlfir.maxval %[[ARRAY]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, !fir.ref<!fir.array<?x!fir.logical<4>>>) -> i32
+// CHECK-NEXT: return
+// CHECK-NEXT: }
diff --git a/flang/test/HLFIR/memory-effects.fir b/flang/test/HLFIR/memory-effects.fir
index a49dc1678116362..f30d1b86c4d862a 100644
--- a/flang/test/HLFIR/memory-effects.fir
+++ b/flang/test/HLFIR/memory-effects.fir
@@ -92,6 +92,21 @@ func.func @sum_effects(%arg0: !fir.ref<!fir.array<2x2xf32>>, %arg1: i32) {
return
}
+func.func @maxval_no_effects(%arg0: !hlfir.expr<?xf32>) {
+// expected-remark at +1 {{operation has no memory effects}}
+ %maxval = hlfir.maxval %arg0 : (!hlfir.expr<?xf32>) -> f32
+// expected-remark at +1 {{operation has no memory effects}}
+ return
+}
+
+func.func @maxval_effects(%arg0: !fir.ref<!fir.array<2x2xf32>>, %arg1: i32) {
+// expected-remark at +2 {{found an instance of 'allocate' on a value, on resource '<Default>'}}
+// expected-remark at +1 {{found an instance of 'read' on a value, on resource '<Default>'}}
+ %maxval = hlfir.maxval %arg0 dim %arg1 : (!fir.ref<!fir.array<2x2xf32>>, i32) -> !hlfir.expr<2xf32>
+// expected-remark at +1 {{operation has no memory effects}}
+ return
+}
+
func.func @dot_product_no_effects(%arg0: !hlfir.expr<?xf32>, %arg1: !hlfir.expr<?xf32>) {
// expected-remark at +1 {{operation has no memory effects}}
%0 = hlfir.dot_product %arg0 %arg1 : (!hlfir.expr<?xf32>, !hlfir.expr<?xf32>) -> f32
diff --git a/flang/test/Lower/HLFIR/maxval.f90 b/flang/test/Lower/HLFIR/maxval.f90
new file mode 100644
index 000000000000000..5adad286a77d28b
--- /dev/null
+++ b/flang/test/Lower/HLFIR/maxval.f90
@@ -0,0 +1,262 @@
+! Test lowering of MAXVAL intrinsic to HLFIR
+! RUN: bbc -emit-hlfir -o - %s 2>&1 | FileCheck %s
+
+! simple 1 argument MAXVAL
+subroutine maxval1(a, s)
+ integer :: a(:), s
+ s = MAXVAL(a)
+end subroutine
+! CHECK-LABEL: func.func @_QPmaxval1(
+! CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?xi32>> {fir.bindc_name = "a"}, %[[ARG1:.*]]: !fir.ref<i32>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[OUT:.*]]:2 = hlfir.declare %[[ARG1]]
+! CHECK-NEXT: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY]]#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?xi32>>) -> i32
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[OUT]]#0 : i32, !fir.ref<i32>
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+! maxval with by-ref DIM argument
+subroutine maxval2(a, s, d)
+ integer :: a(:,:), s(:), d
+ s = MAXVAL(a, d)
+end subroutine
+! CHECK-LABEL: func.func @_QPmaxval2(
+! CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?x?xi32>> {fir.bindc_name = "a"}, %[[ARG1:.*]]: !fir.box<!fir.array<?xi32>> {fir.bindc_name = "s"}, %[[ARG2:.*]]: !fir.ref<i32>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[OUT:.*]]:2 = hlfir.declare %[[ARG1]]
+! CHECK-DAG: %[[DIM_REF:.*]]:2 = hlfir.declare %[[ARG2]]
+! CHECK-NEXT: %[[DIM:.*]] = fir.load %[[DIM_REF]]#0 : !fir.ref<i32>
+! CHECK-NEXT: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY]]#0 dim %[[DIM]] {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?x?xi32>>, i32) -> !hlfir.expr<?xi32>
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[OUT]]#0 : !hlfir.expr<?xi32>, !fir.box<!fir.array<?xi32>>
+! CHECK-NEXT: hlfir.destroy %[[EXPR]]
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+! maxval with scalar mask argument
+subroutine maxval3(a, s, m)
+ integer :: a(:), s
+ logical :: m
+ s = MAXVAL(a, m)
+end subroutine
+! CHECK-LABEL: func.func @_QPmaxval3(
+! CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?xi32>> {fir.bindc_name = "a"}, %[[ARG1:.*]]: !fir.ref<i32> {fir.bindc_name = "s"}, %[[ARG2:.*]]: !fir.ref<!fir.logical<4>>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[OUT:.*]]:2 = hlfir.declare %[[ARG1]]
+! CHECK-DAG: %[[MASK:.*]]:2 = hlfir.declare %[[ARG2]]
+! CHECK-NEXT: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY]]#0 mask %[[MASK]]#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?xi32>>, !fir.ref<!fir.logical<4>>) -> i32
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[OUT]]#0 : i32, !fir.ref<i32>
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+! maxval with array mask argument
+subroutine maxval4(a, s, m)
+ integer :: a(:), s
+ logical :: m(:)
+ s = MAXVAL(a, m)
+end subroutine
+! CHECK-LABEL: func.func @_QPmaxval4(
+! CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?xi32>> {fir.bindc_name = "a"}, %[[ARG1:.*]]: !fir.ref<i32> {fir.bindc_name = "s"}, %[[ARG2:.*]]: !fir.box<!fir.array<?x!fir.logical<4>>>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[OUT:.*]]:2 = hlfir.declare %[[ARG1]]
+! CHECK-DAG: %[[MASK:.*]]:2 = hlfir.declare %[[ARG2]]
+! CHECK-NEXT: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY]]#0 mask %[[MASK]]#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.array<?x!fir.logical<4>>>) -> i32
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[OUT]]#0 : i32, !fir.ref<i32>
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+! maxval with all 3 arguments, dim is by-val, array isn't boxed
+subroutine maxval5(s)
+ integer :: s(2)
+ integer :: a(2,2) = reshape((/1, 2, 3, 4/), [2,2])
+ s = maxval(a, 1, .true.)
+end subroutine
+! CHECK-LABEL: func.func @_QPmaxval5
+! CHECK: %[[ARG0:.*]]: !fir.ref<!fir.array<2xi32>>
+! CHECK-DAG: %[[ADDR:.*]] = fir.address_of({{.*}}) : !fir.ref<!fir.array<2x2xi32>>
+! CHECK-DAG: %[[ARRAY_SHAPE:.*]] = fir.shape {{.*}} -> !fir.shape<2>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ADDR]](%[[ARRAY_SHAPE]])
+! CHECK-DAG: %[[OUT_SHAPE:.*]] = fir.shape {{.*}} -> !fir.shape<1>
+! CHECK-DAG: %[[OUT:.*]]:2 = hlfir.declare %[[ARG0]](%[[OUT_SHAPE]])
+! CHECK-DAG: %[[TRUE:.*]] = arith.constant true
+! CHECK-DAG: %[[C1:.*]] = arith.constant 1 : i32
+! CHECK-NEXT: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY]]#0 dim %[[C1]] mask %[[TRUE]] {fastmath = #arith.fastmath<contract>} : (!fir.ref<!fir.array<2x2xi32>>, i32, i1) -> !hlfir.expr<2xi32>
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[OUT]]#0 : !hlfir.expr<2xi32>, !fir.ref<!fir.array<2xi32>>
+! CHECK-NEXT: hlfir.destroy %[[EXPR]] : !hlfir.expr<2xi32>
+! CHECK-NEXT: return
+! CHECK-nEXT: }
+
+subroutine maxval6(a, s, d)
+ integer, pointer :: d
+ real :: a(:,:), s(:)
+ s = maxval(a, (d))
+end subroutine
+! CHECK-LABEL: func.func @_QPmaxval6(
+! CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?x?xf32>>
+! CHECK: %[[ARG1:.*]]: !fir.box<!fir.array<?xf32>>
+! CHECK: %[[ARG2:.*]]: !fir.ref<!fir.box<!fir.ptr<i32>>>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[OUT:.*]]:2 = hlfir.declare %[[ARG1]]
+! CHECK-DAG: %[[DIM_VAR:.*]]:2 = hlfir.declare %[[ARG2]]
+! CHECK-NEXT: %[[DIM_BOX:.*]] = fir.load %[[DIM_VAR]]#0 : !fir.ref<!fir.box<!fir.ptr<i32>>>
+! CHECK-NEXT: %[[DIM_ADDR:.*]] = fir.box_addr %[[DIM_BOX]] : (!fir.box<!fir.ptr<i32>>) -> !fir.ptr<i32>
+! CHECK-NEXT: %[[DIM0:.*]] = fir.load %[[DIM_ADDR]] : !fir.ptr<i32>
+! CHECK-NEXT: %[[DIM1:.*]] = hlfir.no_reassoc %[[DIM0]] : i32
+! CHECK-NEXT: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY]]#0 dim %[[DIM1]] {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?x?xf32>>, i32) -> !hlfir.expr<?xf32>
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[OUT]]#0 : !hlfir.expr<?xf32>, !fir.box<!fir.array<?xf32>>
+! CHECK-NEXT: hlfir.destroy %[[EXPR]]
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+! simple 1 argument MAXVAL for character
+subroutine maxval7(a, s)
+ character(*) :: a(:), s
+ s = MAXVAL(a)
+end subroutine
+! CHECK-LABEL: func.func @_QPmaxval7(
+! CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?x!fir.char<1,?>>> {fir.bindc_name = "a"}, %[[ARG1:.*]]: !fir.boxchar<1>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[UNBOXED:.*]]:2 = fir.unboxchar %[[ARG1]]
+! CHECK-DAG: %[[OUT:.*]]:2 = hlfir.declare %[[UNBOXED]]#0 typeparams %[[UNBOXED]]#1
+! CHECK-NEXT: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY]]#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?x!fir.char<1,?>>>) -> !hlfir.expr<!fir.char<1,?>>
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[OUT]]#0 : !hlfir.expr<!fir.char<1,?>>, !fir.boxchar<1>
+! CHECK-NEXT: hlfir.destroy %[[EXPR]]
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+! maxval for character with by-ref DIM argument
+subroutine maxval8(a, s, d)
+ character(*) :: a(:,:), s(:)
+ integer :: d
+ s = MAXVAL(a, d)
+end subroutine
+! CHECK-LABEL: func.func @_QPmaxval8(
+! CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?x?x!fir.char<1,?>>> {fir.bindc_name = "a"}, %[[ARG1:.*]]: !fir.box<!fir.array<?x!fir.char<1,?>>> {fir.bindc_name = "s"}, %[[ARG2:.*]]: !fir.ref<i32>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[OUT:.*]]:2 = hlfir.declare %[[ARG1]]
+! CHECK-DAG: %[[DIM_REF:.*]]:2 = hlfir.declare %[[ARG2]]
+! CHECK-NEXT: %[[DIM:.*]] = fir.load %[[DIM_REF]]#0 : !fir.ref<i32>
+! CHECK-NEXT: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY]]#0 dim %[[DIM]] {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?x?x!fir.char<1,?>>>, i32) -> !hlfir.expr<?x!fir.char<1,?>>
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[OUT]]#0 : !hlfir.expr<?x!fir.char<1,?>>, !fir.box<!fir.array<?x!fir.char<1,?>>>
+! CHECK-NEXT: hlfir.destroy %[[EXPR]]
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+! maxval for character with scalar mask argument
+subroutine maxval9(a, s, m)
+ character(*) :: a(:), s
+ logical :: m
+ s = MAXVAL(a, m)
+end subroutine
+! CHECK-LABEL: func.func @_QPmaxval9(
+! CHECK: %[[ARG0:.*]]: !fir.box<!fir.array<?x!fir.char<1,?>>> {fir.bindc_name = "a"}, %[[ARG1:.*]]: !fir.boxchar<1> {fir.bindc_name = "s"}, %[[ARG2:.*]]: !fir.ref<!fir.logical<4>>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[UNBOXED:.*]]:2 = fir.unboxchar %[[ARG1]]
+! CHECK-DAG: %[[MASK:.*]]:2 = hlfir.declare %[[ARG2]]
+! CHECK-DAG: %[[OUT:.*]]:2 = hlfir.declare %[[UNBOXED]]#0 typeparams %[[UNBOXED]]#1
+! CHECK-NEXT: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY]]#0 mask %[[MASK]]#0 {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<?x!fir.char<1,?>>>, !fir.ref<!fir.logical<4>>) -> !hlfir.expr<!fir.char<1,?>>
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[OUT]]#0 : !hlfir.expr<!fir.char<1,?>>, !fir.boxchar<1>
+! CHECK-NEXT: hlfir.destroy %[[EXPR]]
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+subroutine testDynamicallyOptionalMask(array, mask, res)
+ integer :: array(:), res
+ logical, allocatable :: mask(:)
+ res = MAXVAL(array, mask=mask)
+end subroutine
+! CHECK-LABEL: func.func @_QPtestdynamicallyoptionalmask(
+! CHECK-SAME: %[[ARG0:.*]]: !fir.box<!fir.array<?xi32>>
+! CHECK-SAME: %[[ARG1:.*]]: !fir.ref<!fir.box<!fir.heap<!fir.array<?x!fir.logical<4>>>>>
+! CHECK-SAME: %[[ARG2:.*]]: !fir.ref<i32>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[MASK:.*]]:2 = hlfir.declare %[[ARG1]]
+! CHECK-DAG: %[[RES:.*]]:2 = hlfir.declare %[[ARG2]]
+! CHECK-NEXT: %[[MASK_LOAD:.*]] = fir.load %[[MASK]]#1
+! CHECK-NEXT: %[[MASK_ADDR:.*]] = fir.box_addr %[[MASK_LOAD]]
+! CHECK-NEXT: %[[MASK_ADDR_INT:.*]] = fir.convert %[[MASK_ADDR]]
+! CHECK-NEXT: %[[C0:.*]] = arith.constant 0 : i64
+! CHECK-NEXT: %[[CMP:.*]] = arith.cmpi ne, %[[MASK_ADDR_INT]], %[[C0]] : i64
+! it is a shame there is a second load here. The first is generated for
+! PreparedActualArgument::isPresent, the second is for optional handling
+! CHECK-NEXT: %[[MASK_LOAD2:.*]] = fir.load %[[MASK]]#1
+! CHECK-NEXT: %[[ABSENT:.*]] = fir.absent !fir.box<!fir.heap<!fir.array<?x!fir.logical<4>>>>
+! CHECK-NEXT: %[[SELECT:.*]] = arith.select %[[CMP]], %[[MASK_LOAD2]], %[[ABSENT]]
+! CHECK-NEXT: %[[MAXVAL:.*]] = hlfir.maxval %[[ARRAY]]#0 mask %[[SELECT]]
+! CHECK-NEXT: hlfir.assign %[[MAXVAL]] to %[[RES]]#0
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+subroutine testAllocatableArray(array, mask, res)
+ integer, allocatable :: array(:)
+ integer :: res
+ logical :: mask(:)
+ res = MAXVAL(array, mask=mask)
+end subroutine
+! CHECK-LABEL: func.func @_QPtestallocatablearray(
+! CHECK-SAME: %[[ARG0:.*]]: !fir.ref<!fir.box<!fir.heap<!fir.array<?xi32>>>>
+! CHECK-SAME: %[[ARG1:.*]]: !fir.box<!fir.array<?x!fir.logical<4>>>
+! CHECK-SAME: %[[ARG2:.*]]: !fir.ref<i32>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARG0]]
+! CHECK-DAG: %[[MASK:.*]]:2 = hlfir.declare %[[ARG1]]
+! CHECK-DAG: %[[RES:.*]]:2 = hlfir.declare %[[ARG2]]
+! CHECK-NEXT: %[[LOADED_ARRAY:.*]] = fir.load %[[ARRAY]]#0
+! CHECK-NEXT: %[[MAXVAL:.*]] = hlfir.maxval %[[LOADED_ARRAY]] mask %[[MASK]]#0
+! CHECK-NEXT: hlfir.assign %[[MAXVAL]] to %[[RES]]#0
+! CHECK-NEXT: return
+! CHECK-NEXT: }
+
+function testOptionalScalar(array, mask)
+ integer :: array(:)
+ logical, optional :: mask
+ integer :: testOptionalScalar
+ testOptionalScalar = maxval(array, mask)
+end function
+! CHECK-LABEL: func.func @_QPtestoptionalscalar(
+! CHECK-SAME: %[[ARRAY_ARG:.*]]: !fir.box<!fir.array<?xi32>> {fir.bindc_name = "array"},
+! CHECK-SAME: %[[MASK_ARG:.*]]: !fir.ref<!fir.logical<4>> {fir.bindc_name = "mask", fir.optional}) -> i32
+! CHECK: %[[ARRAY_VAR:.*]]:2 = hlfir.declare %[[ARRAY_ARG]]
+! CHECK: %[[MASK_VAR:.*]]:2 = hlfir.declare %[[MASK_ARG]]
+! CHECK: %[[RET_ALLOC:.*]] = fir.alloca i32 {bindc_name = "testoptionalscalar", uniq_name = "_QFtestoptionalscalarEtestoptionalscalar"}
+! CHECK: %[[RET_VAR:.*]]:2 = hlfir.declare %[[RET_ALLOC]]
+! CHECK: %[[MASK_IS_PRESENT:.*]] = fir.is_present %[[MASK_VAR]]#0 : (!fir.ref<!fir.logical<4>>) -> i1
+! CHECK: %[[MASK_BOX:.*]] = fir.embox %[[MASK_VAR]]#1
+! CHECK: %[[ABSENT:.*]] = fir.absent !fir.box<!fir.logical<4>>
+! CHECK: %[[MASK_SELECT:.*]] = arith.select %[[MASK_IS_PRESENT]], %[[MASK_BOX]], %[[ABSENT]]
+! CHECK: %[[RES:.*]] = hlfir.maxval %[[ARRAY_VAR]]#0 mask %[[MASK_SELECT]] {{.*}}: (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.logical<4>>) -> i32
+! CHECK: hlfir.assign %[[RES]] to %[[RET_VAR]]#0
+! CHECK: %[[RET:.*]] = fir.load %[[RET_VAR]]#1 : !fir.ref<i32>
+! CHECK: return %[[RET]] : i32
+! CHECK: }
+
+! Test that hlfir.maxval lowering inherits constant
+! character length from the argument, when the length
+! is unknown from the Fortran::evaluate expression type.
+subroutine test_unknown_char_len_result
+ character(len=3) :: array(3,3), res
+ res = maxval(array(:,:)(:))
+end subroutine test_unknown_char_len_result
+! CHECK-LABEL: func.func @_QPtest_unknown_char_len_result() {
+! CHECK-DAG: %[[C3:.*]] = arith.constant 3 : index
+! CHECK-DAG: %[[C3_0:.*]] = arith.constant 3 : index
+! CHECK-DAG: %[[C3_1:.*]] = arith.constant 3 : index
+! CHECK-DAG: %[[ARRAY_ALLOC:.*]] = fir.alloca !fir.array<3x3x!fir.char<1,3>>
+! CHECK-DAG: %[[ARRAY_SHAPE:.*]] = fir.shape %[[C3_0]], %[[C3_1]] : (index, index) -> !fir.shape<2>
+! CHECK-DAG: %[[ARRAY:.*]]:2 = hlfir.declare %[[ARRAY_ALLOC]](%[[ARRAY_SHAPE]]) typeparams %[[C3]]
+! CHECK-DAG: %[[C3_2:.*]] = arith.constant 3 : index
+! CHECK-DAG: %[[RES_ALLOC:.*]] = fir.alloca !fir.char<1,3>
+! CHECK-DAG: %[[RES:.*]]:2 = hlfir.declare %[[RES_ALLOC]] typeparams %[[C3_2]]
+! CHECK-DAG: %[[C1:.*]] = arith.constant 1 : index
+! CHECK-DAG: %[[C1_3:.*]] = arith.constant 1 : index
+! CHECK-DAG: %[[C3_4:.*]] = arith.constant 3 : index
+! CHECK-DAG: %[[C1_5:.*]] = arith.constant 1 : index
+! CHECK-DAG: %[[C3_6:.*]] = arith.constant 3 : index
+! CHECK-DAG: %[[SHAPE:.*]] = fir.shape %[[C3_4]], %[[C3_6]] : (index, index) -> !fir.shape<2>
+! CHECK-DAG: %[[C1_7:.*]] = arith.constant 1 : index
+! CHECK-DAG: %[[C3_8:.*]] = arith.constant 3 : index
+! CHECK-DAG: %[[C3_9:.*]] = arith.constant 3 : index
+! CHECK-DAG: %[[ARRAY_BOX:.*]] = hlfir.designate %[[ARRAY]]#0 (%[[C1]]:%[[C3_0]]:%[[C1_3]], %[[C1]]:%[[C3_1]]:%[[C1_5]]) substr %[[C1_7]], %[[C3_8]] shape %[[SHAPE]] typeparams %[[C3_9]]
+! CHECK: %[[EXPR:.*]] = hlfir.maxval %[[ARRAY_BOX]] {fastmath = #arith.fastmath<contract>} : (!fir.box<!fir.array<3x3x!fir.char<1,3>>>) -> !hlfir.expr<!fir.char<1,3>>
+! CHECK-NEXT: hlfir.assign %[[EXPR]] to %[[RES]]#0 : !hlfir.expr<!fir.char<1,3>>, !fir.ref<!fir.char<1,3>>
+! CHECK-NEXT: hlfir.destroy %[[EXPR]]
+! CHECK-NEXT: return
+! CHECK-NEXT: }
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