[flang][hlfir] Add hlfir.minval intrinsic (#66306)

Adds a new HLFIR operation for the MINVAL intrinsic according to the
design set out in flang/docs/HighLevelFIR.md.

flang/include/flang/Optimizer/HLFIR/HLFIROps.td

@@ -431,6 +431,33 @@ def hlfir_MaxvalOp : hlfir_Op<"maxval", [AttrSizedOperandSegments,
   let hasVerifier = 1;
 }
 
+def hlfir_MinvalOp : hlfir_Op<"minval", [AttrSizedOperandSegments,
+    DeclareOpInterfaceMethods<ArithFastMathInterface>,
+    DeclareOpInterfaceMethods<MemoryEffectsOpInterface>]> {
+  let summary = "MINVAL transformational intrinsic";
+  let description = [{
+    Minimum 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>]> {

flang/lib/Lower/HlfirIntrinsics.cpp

@@ -89,6 +89,7 @@ protected:
 using HlfirSumLowering = HlfirReductionIntrinsic<hlfir::SumOp, true>;
 using HlfirProductLowering = HlfirReductionIntrinsic<hlfir::ProductOp, true>;
 using HlfirMaxvalLowering = HlfirReductionIntrinsic<hlfir::MaxvalOp, true>;
+using HlfirMinvalLowering = HlfirReductionIntrinsic<hlfir::MinvalOp, true>;
 using HlfirAnyLowering = HlfirReductionIntrinsic<hlfir::AnyOp, false>;
 using HlfirAllLowering = HlfirReductionIntrinsic<hlfir::AllOp, false>;
 
@@ -356,6 +357,9 @@ std::optional<hlfir::EntityWithAttributes> Fortran::lower::lowerHlfirIntrinsic(
   if (name == "maxval")
     return HlfirMaxvalLowering{builder, loc}.lower(loweredActuals, argLowering,
                                                    stmtResultType);
+  if (name == "minval")
+    return HlfirMinvalLowering{builder, loc}.lower(loweredActuals, argLowering,
+                                                   stmtResultType);
   if (mlir::isa<fir::CharacterType>(stmtResultType)) {
     if (name == "min")
       return HlfirCharExtremumLowering{builder, loc,

flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp

@@ -845,6 +845,31 @@ void hlfir::MaxvalOp::getEffects(
   getIntrinsicEffects(getOperation(), effects);
 }
 
+//===----------------------------------------------------------------------===//
+// MinvalOp
+//===----------------------------------------------------------------------===//
+
+mlir::LogicalResult hlfir::MinvalOp::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::MinvalOp *>(this);
+  } else {
+    return verifyNumericalReductionOp<hlfir::MinvalOp *>(this);
+  }
+}
+
+void hlfir::MinvalOp::getEffects(
+    llvm::SmallVectorImpl<
+        mlir::SideEffects::EffectInstance<mlir::MemoryEffects::Effect>>
+        &effects) {
+  getIntrinsicEffects(getOperation(), effects);
+}
+
 //===----------------------------------------------------------------------===//
 // SetLengthOp
 //===----------------------------------------------------------------------===//

flang/lib/Optimizer/HLFIR/Transforms/LowerHLFIRIntrinsics.cpp

@@ -222,6 +222,8 @@ public:
       opName = "product";
     } else if constexpr (std::is_same_v<OP, hlfir::MaxvalOp>) {
       opName = "maxval";
+    } else if constexpr (std::is_same_v<OP, hlfir::MinvalOp>) {
+      opName = "minval";
     } else if constexpr (std::is_same_v<OP, hlfir::AnyOp>) {
       opName = "any";
     } else if constexpr (std::is_same_v<OP, hlfir::AllOp>) {
@@ -241,7 +243,8 @@ public:
 
     if constexpr (std::is_same_v<OP, hlfir::SumOp> ||
                   std::is_same_v<OP, hlfir::ProductOp> ||
-                  std::is_same_v<OP, hlfir::MaxvalOp>) {
+                  std::is_same_v<OP, hlfir::MaxvalOp> ||
+                  std::is_same_v<OP, hlfir::MinvalOp>) {
       args = buildNumericalArgs(operation, i32, logicalType, rewriter, opName);
     } else {
       args = buildLogicalArgs(operation, i32, logicalType, rewriter, opName);
@@ -264,6 +267,8 @@ using ProductOpConversion = HlfirReductionIntrinsicConversion<hlfir::ProductOp>;
 
 using MaxvalOpConversion = HlfirReductionIntrinsicConversion<hlfir::MaxvalOp>;
 
+using MinvalOpConversion = HlfirReductionIntrinsicConversion<hlfir::MinvalOp>;
+
 using AnyOpConversion = HlfirReductionIntrinsicConversion<hlfir::AnyOp>;
 
 using AllOpConversion = HlfirReductionIntrinsicConversion<hlfir::AllOp>;
@@ -440,7 +445,8 @@ public:
         .insert<MatmulOpConversion, MatmulTransposeOpConversion,
                 AllOpConversion, AnyOpConversion, SumOpConversion,
                 ProductOpConversion, TransposeOpConversion, CountOpConversion,
-                DotProductOpConversion, MaxvalOpConversion>(context);
+                DotProductOpConversion, MaxvalOpConversion, MinvalOpConversion>(
+            context);
     mlir::ConversionTarget target(*context);
     target.addLegalDialect<mlir::BuiltinDialect, mlir::arith::ArithDialect,
                            mlir::func::FuncDialect, fir::FIROpsDialect,
@@ -448,7 +454,7 @@ public:
     target.addIllegalOp<hlfir::MatmulOp, hlfir::MatmulTransposeOp, hlfir::SumOp,
                         hlfir::ProductOp, hlfir::TransposeOp, hlfir::AnyOp,
                         hlfir::AllOp, hlfir::DotProductOp, hlfir::CountOp,
-                        hlfir::MaxvalOp>();
+                        hlfir::MaxvalOp, hlfir::MinvalOp>();
     target.markUnknownOpDynamicallyLegal(
         [](mlir::Operation *) { return true; });
     if (mlir::failed(

flang/test/HLFIR/invalid.fir

@@ -470,6 +470,84 @@ func.func @bad_maxval13(%arg0: !hlfir.expr<?x?x!fir.char<1,?>>, %arg1: i32){
   %0 = hlfir.maxval %arg0 dim %arg1 : (!hlfir.expr<?x?x!fir.char<1,?>>, i32) -> !hlfir.expr<!fir.char<1,?>>
 }
 
+// -----
+func.func @bad_minval1(%arg0: !hlfir.expr<?xi32>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+  // expected-error@+1 {{'hlfir.minval' op result must have the same element type as ARRAY argument}}
+  %0 = hlfir.minval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?xi32>, i32, !fir.box<!fir.logical<4>>) -> f32
+}
+
+// -----
+func.func @bad_minval2(%arg0: !hlfir.expr<?xi32>, %arg1: i32, %arg2: !fir.box<!fir.array<?x?x?x?x?x!fir.logical<4>>>) {
+  // expected-warning@+1 {{MASK must be conformable to ARRAY}}
+  %0 = hlfir.minval %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_minval3(%arg0: !hlfir.expr<?x5x?xi32>, %arg1: i32, %arg2: !fir.box<!fir.array<2x6x?x!fir.logical<4>>>) {
+  // expected-warning@+1 {{MASK must be conformable to ARRAY}}
+  %0 = hlfir.minval %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_minval4(%arg0: !hlfir.expr<?x?xi32>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+  // expected-error@+1 {{'hlfir.minval' op result rank must be one less than ARRAY}}
+  %0 = hlfir.minval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?x?xi32>, i32, !fir.box<!fir.logical<4>>) -> !hlfir.expr<?x?xi32>
+}
+
+// -----
+func.func @bad_minval5(%arg0: !hlfir.expr<?xi32>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+  // expected-error@+1 {{'hlfir.minval' op result must be of numerical scalar type}}
+  %0 = hlfir.minval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?xi32>, i32, !fir.box<!fir.logical<4>>) -> !fir.logical<4>
+}
+
+// -----
+func.func @bad_minval6(%arg0: !hlfir.expr<?x?xi32>, %arg1: i32){
+  // expected-error@+1 {{'hlfir.minval' op result must be an array}}
+  %0 = hlfir.minval %arg0 dim %arg1 : (!hlfir.expr<?x?xi32>, i32) -> !hlfir.expr<i32>
+}
+
+// -----
+func.func @bad_minval7(%arg0: !hlfir.expr<?xi32>){
+  // expected-error@+1 {{'hlfir.minval' op result must be of numerical scalar type}}
+  %0 = hlfir.minval %arg0 : (!hlfir.expr<?xi32>) -> !hlfir.expr<i32>
+}
+
+// -----
+func.func @bad_minval8(%arg0: !hlfir.expr<?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+  // expected-error@+1 {{'hlfir.minval' op result must have the same element type as ARRAY argument}}
+  %0 = hlfir.minval %arg0 dim %arg1 mask %arg2 : (!hlfir.expr<?x!fir.char<1,?>>, i32, !fir.box<!fir.logical<4>>) -> i32
+}
+
+// -----
+func.func @bad_minval9(%arg0: !hlfir.expr<?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.array<?x?x?x?x?x!fir.logical<4>>>) {
+  // expected-warning@+1 {{MASK must be conformable to ARRAY}}
+  %0 = hlfir.minval %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_minval10(%arg0: !hlfir.expr<?x5x?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.array<2x6x?x!fir.logical<4>>>) {
+  // expected-warning@+1 {{MASK must be conformable to ARRAY}}
+  %0 = hlfir.minval %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_minval11(%arg0: !hlfir.expr<?x?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+  // expected-error@+1 {{'hlfir.minval' op result rank must be one less than ARRAY}}
+  %0 = hlfir.minval %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_minval12(%arg0: !hlfir.expr<?x!fir.char<1,?>>, %arg1: i32, %arg2: !fir.box<!fir.logical<4>>) {
+  // expected-error@+1 {{'hlfir.minval' op result must be scalar character}}
+  %0 = hlfir.minval %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_minval13(%arg0: !hlfir.expr<?x?x!fir.char<1,?>>, %arg1: i32){
+  // expected-error@+1 {{'hlfir.minval' op result must be an array}}
+  %0 = hlfir.minval %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@+1 {{'hlfir.product' op result must have the same element type as ARRAY argument}}

flang/test/HLFIR/memory-effects.fir

@@ -107,6 +107,21 @@ func.func @maxval_effects(%arg0: !fir.ref<!fir.array<2x2xf32>>, %arg1: i32) {
   return
 }
 
+func.func @minval_no_effects(%arg0: !hlfir.expr<?xf32>) {
+// expected-remark@+1 {{operation has no memory effects}}
+  %minval = hlfir.minval %arg0 : (!hlfir.expr<?xf32>) -> f32
+// expected-remark@+1 {{operation has no memory effects}}
+  return
+}
+
+func.func @minval_effects(%arg0: !fir.ref<!fir.array<2x2xf32>>, %arg1: i32) {
+// expected-remark@+2 {{found an instance of 'allocate' on a value, on resource '<Default>'}}
+// expected-remark@+1 {{found an instance of 'read' on a value, on resource '<Default>'}}
+  %minval = hlfir.minval %arg0 dim %arg1 : (!fir.ref<!fir.array<2x2xf32>>, i32) -> !hlfir.expr<2xf32>
+// expected-remark@+1 {{operation has no memory effects}}
+  return
+}
+
 func.func @dot_product_no_effects(%arg0: !hlfir.expr<?xf32>, %arg1: !hlfir.expr<?xf32>) {
 // expected-remark@+1 {{operation has no memory effects}}
   %0 = hlfir.dot_product %arg0 %arg1 : (!hlfir.expr<?xf32>, !hlfir.expr<?xf32>) -> f32

flang/test/HLFIR/minval-lowering.fir

@@ -0,0 +1,218 @@
+// Test hlfir.minval operation lowering to fir runtime call
+// RUN: fir-opt %s -lower-hlfir-intrinsics | FileCheck %s
+
+// simple one argument minval
+func.func @_QPminval1(%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 = "_QFminval1Ea"} : (!fir.box<!fir.array<?xi32>>) -> (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.array<?xi32>>)
+  %1:2 = hlfir.declare %arg1 {uniq_name = "_QFminval1Es"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
+  %2 = hlfir.minval %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 @_QPminval1(
+// 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 @_FortranAMinvalInteger4(%[[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:  }
+
+// minval with a by-ref dimension of index type
+func.func @_QPminval2(%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 = "_QFminval2Ea"} : (!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 = "_QFminval2Ed"} : (!fir.ref<index>) -> (!fir.ref<index>, !fir.ref<index>)
+  %2:2 = hlfir.declare %arg1 {uniq_name = "_QFminval2Es"} : (!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.minval %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 @_QPminval2(
+// 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 @_FortranAMinvalDim(%[[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:  }
+
+// minval with scalar mask
+func.func @_QPminval3(%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 = "_QFminval3Ea"} : (!fir.box<!fir.array<?xi32>>) -> (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.array<?xi32>>)
+  %1:2 = hlfir.declare %arg2 {uniq_name = "_QFminval3Em"} : (!fir.ref<!fir.logical<4>>) -> (!fir.ref<!fir.logical<4>>, !fir.ref<!fir.logical<4>>)
+  %2:2 = hlfir.declare %arg1 {uniq_name = "_QFminval3Es"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
+  %3 = hlfir.minval %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 @_QPminval3(
+// 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 @_FortranAMinvalInteger4(%[[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:  }
+
+// minval with array mask
+func.func @_QPminval4(%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 = "_QFminval4Ea"} : (!fir.box<!fir.array<?xi32>>) -> (!fir.box<!fir.array<?xi32>>, !fir.box<!fir.array<?xi32>>)
+  %1:2 = hlfir.declare %arg2 {uniq_name = "_QFminval4Em"} : (!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 = "_QFminval4Es"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
+  %3 = hlfir.minval %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 @_QPminval4(
+// 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 @_FortranAMinvalInteger4(%[[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 @_QFminval5Ea : !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 minval, using local variables
+func.func @_QPminval5(%arg0: !fir.ref<!fir.array<2xi32>> {fir.bindc_name = "s"}) {
+  %0 = fir.address_of(@_QFminval5Ea) : !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 = "_QFminval5Ea"} : (!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 = "_QFminval5Es"} : (!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.minval %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 @_QPminval5(
+// 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 @_FortranAMinvalDim(%[[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 minval for character
+func.func @_QPminval6(%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 = "_QFminval6Ea"} : (!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 = "_QFminval6Es"} : (!fir.ref<!fir.char<1,?>>, index) -> (!fir.boxchar<1>, !fir.ref<!fir.char<1,?>>)
+  %3 = hlfir.minval %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 @_QPminval6(
+// 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 @_FortranAMinvalCharacter(%[[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:  }

flang/test/HLFIR/minval.fir

@@ -0,0 +1,249 @@
+// Test hlfir.minval operation parse, verify (no errors), and unparse
+
+// RUN: fir-opt %s | fir-opt | FileCheck %s
+
+// array is an expression of known shape
+func.func @minval0(%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.minval %arg0 dim %c_1 mask %mask_box : (!hlfir.expr<42xi32>, index, !fir.box<!fir.logical<4>>) -> i32
+  return
+}
+// CHECK:      func.func @minval0(%[[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.minval %[[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 @minval1(%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.minval %arg0 dim %c_1 mask %mask_box : (!hlfir.expr<?xi32>, index, !fir.box<!fir.logical<4>>) -> i32
+  return
+}
+// CHECK:      func.func @minval1(%[[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.minval %[[ARRAY:.*]] dim %[[C1]] mask %[[BOX]] : (!hlfir.expr<?xi32>, index, !fir.box<!fir.logical<4>>) -> i32
+// CHECK-NEXT:   return
+// CHECK-NEXT: }
+
+// boxed array
+func.func @minval2(%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.minval %arg0 dim %c_1 mask %mask_box : (!fir.box<!fir.array<42xi32>>, index, !fir.box<!fir.logical<4>>) -> i32
+  return
+}
+// CHECK:      func.func @minval2(%[[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.minval %[[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 @minval3(%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.minval %arg0 dim %c_1 mask %mask_box : (!fir.box<!fir.array<?xi32>>, index, !fir.box<!fir.logical<4>>) -> i32
+  return
+}
+// CHECK:      func.func @minval3(%[[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.minval %[[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 @minval4(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !hlfir.expr<42x!fir.logical<4>>) {
+  %c_1 = arith.constant 1 : index
+  %0 = hlfir.minval %arg0 dim %c_1 mask %arg1 : (!fir.box<!fir.array<?xi32>>, index, !hlfir.expr<42x!fir.logical<4>>) -> i32
+  return
+}
+// CHECK:      func.func @minval4(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !hlfir.expr<42x!fir.logical<4>>) {
+// CHECK-NEXT:   %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT:   hlfir.minval %[[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 @minval5(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !hlfir.expr<?x!fir.logical<4>>) {
+  %c_1 = arith.constant 1 : index
+  %0 = hlfir.minval %arg0 dim %c_1 mask %arg1 : (!fir.box<!fir.array<?xi32>>, index, !hlfir.expr<?x!fir.logical<4>>) -> i32
+  return
+}
+// CHECK:      func.func @minval5(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !hlfir.expr<?x!fir.logical<4>>) {
+// CHECK-NEXT:   %[[C1:.*]] = arith.constant 1 : index
+// CHECK-NEXT:   hlfir.minval %[[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 @minval6(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !fir.box<!fir.array<42x!fir.logical<4>>>) {
+  %c_1 = arith.constant 1 : index
+  %0 = hlfir.minval %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 @minval6(%[[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.minval %[[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 @minval7(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !fir.box<!fir.array<?x!fir.logical<4>>>) {
+  %c_1 = arith.constant 1 : index
+  %0 = hlfir.minval %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 @minval7(%[[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.minval %[[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 @minval8(%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.minval %arg0 dim %arg1 mask %mask_box : (!fir.box<!fir.array<2x2xi32>>, i32, !fir.box<!fir.logical<4>>) -> !hlfir.expr<2xi32>
+  return
+}
+// CHECK:      func.func @minval8(%[[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.minval %[[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 @minval9(%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.minval %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 @minval9(%[[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.minval %[[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.minval with only an array argument
+func.func @minval10(%arg0: !fir.box<!fir.array<?x?xi32>>) {
+  %minval = hlfir.minval %arg0 : (!fir.box<!fir.array<?x?xi32>>) -> i32
+  return
+}
+// CHECK:      func.func @minval10(%[[ARRAY:.*]]: !fir.box<!fir.array<?x?xi32>>
+// CHECK-NEXT:   %[[minval:.*]] = hlfir.minval %[[ARRAY]] : (!fir.box<!fir.array<?x?xi32>>) -> i32
+// CHECK-NEXT:   return
+// CHECK-NEXT: }
+
+// hlfir.minval with only a character array argument
+func.func @minval11(%arg0: !fir.box<!fir.array<?x?x!fir.char<1,?>>>) {
+  %minval = hlfir.minval %arg0 : (!fir.box<!fir.array<?x?x!fir.char<1,?>>>) -> !hlfir.expr<!fir.char<1,?>>
+  return
+}
+// CHECK:      func.func @minval11(%[[ARRAY:.*]]: !fir.box<!fir.array<?x?x!fir.char<1,?>>>
+// CHECK-NEXT:   %[[minval:.*]] = hlfir.minval %[[ARRAY]] : (!fir.box<!fir.array<?x?x!fir.char<1,?>>>) -> !hlfir.expr<!fir.char<1,?>>
+// CHECK-NEXT:   return
+// CHECK-NEXT: }
+
+// hlfir.minval with array and dim argument
+func.func @minval12(%arg0: !fir.box<!fir.array<?x?xi32>>, %arg1: i32) {
+  %minval = hlfir.minval %arg0 dim %arg1 : (!fir.box<!fir.array<?x?xi32>>, i32) -> !hlfir.expr<?xi32>
+  return
+}
+// CHECK:      func.func @minval12(%[[ARRAY:.*]]: !fir.box<!fir.array<?x?xi32>>, %[[DIM:.*]]: i32
+// CHECK-NEXT:   %[[minval:.*]] = hlfir.minval %[[ARRAY]] dim %[[DIM]] : (!fir.box<!fir.array<?x?xi32>>, i32) -> !hlfir.expr<?xi32>
+// CHECK-NEXT:   return
+// CHECK-NEXT: }
+
+// hlfir.minval with array and mask argument
+func.func @minval13(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !fir.logical<4>) {
+  %minval = hlfir.minval %arg0 mask %arg1 : (!fir.box<!fir.array<?xi32>>, !fir.logical<4>) -> i32
+  return
+}
+// CHECK:      func.func @minval13(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !fir.logical<4>
+// CHECK-NEXT:   %[[minval:.*]] = hlfir.minval %[[ARRAY]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, !fir.logical<4>) -> i32
+// CHECK-NEXT:   return
+// CHECK-NEXT: }
+
+// hlfir.minval with dim argument with an unusual type
+func.func @minval14(%arg0: !fir.box<!fir.array<?x?xi32>>, %arg1: index) {
+  %minval = hlfir.minval %arg0 dim %arg1 : (!fir.box<!fir.array<?x?xi32>>, index) -> !hlfir.expr<?xi32>
+  return
+}
+// CHECK:      func.func @minval14(%[[ARRAY:.*]]: !fir.box<!fir.array<?x?xi32>>, %[[DIM:.*]]: index
+// CHECK-NEXT:   %[[minval:.*]] = hlfir.minval %[[ARRAY]] dim %[[DIM]] : (!fir.box<!fir.array<?x?xi32>>, index) -> !hlfir.expr<?xi32>
+// CHECK-NEXT:   return
+// CHECK-NEXT: }
+
+// hlfir.minval with mask argument of unusual type
+func.func @minval15(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: i1) {
+  %minval = hlfir.minval %arg0 mask %arg1 : (!fir.box<!fir.array<?xi32>>, i1) -> i32
+  return
+}
+// CHECK:      func.func @minval15(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: i1
+// CHECK-NEXT:   %[[minval:.*]] = hlfir.minval %[[ARRAY]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, i1) -> i32
+// CHECK-NEXT:   return
+// CHECK-NEXT: }
+
+// hlfir.minval with mask argument of ref<array<>> type
+func.func @minval16(%arg0: !fir.box<!fir.array<?xi32>>, %arg1: !fir.ref<!fir.array<?x!fir.logical<4>>>) {
+  %minval = hlfir.minval %arg0 mask %arg1 : (!fir.box<!fir.array<?xi32>>, !fir.ref<!fir.array<?x!fir.logical<4>>>) -> i32
+  return
+}
+// CHECK:      func.func @minval16(%[[ARRAY:.*]]: !fir.box<!fir.array<?xi32>>, %[[MASK:.*]]: !fir.ref<!fir.array<?x!fir.logical<4>>>
+// CHECK-NEXT:   %[[minval:.*]] = hlfir.minval %[[ARRAY]] mask %[[MASK]] : (!fir.box<!fir.array<?xi32>>, !fir.ref<!fir.array<?x!fir.logical<4>>>) -> i32
+// CHECK-NEXT:   return
+// CHECK-NEXT: }

flang/test/Lower/HLFIR/minval.f90

@@ -0,0 +1,262 @@
+! Test lowering of MINVAL intrinsic to HLFIR
+! RUN: bbc -emit-hlfir -o - %s 2>&1 | FileCheck %s
+
+! simple 1 argument MINVAL
+subroutine minval1(a, s)
+  integer :: a(:), s
+  s = MINVAL(a)
+end subroutine
+! CHECK-LABEL: func.func @_QPminval1(
+! 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.minval %[[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:  }
+
+! minval with by-ref DIM argument
+subroutine minval2(a, s, d)
+  integer :: a(:,:), s(:), d
+  s = MINVAL(a, d)
+end subroutine
+! CHECK-LABEL: func.func @_QPminval2(
+! 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.minval %[[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:  }
+
+! minval with scalar mask argument
+subroutine minval3(a, s, m)
+  integer :: a(:), s
+  logical :: m
+  s = MINVAL(a, m)
+end subroutine
+! CHECK-LABEL: func.func @_QPminval3(
+! 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.minval %[[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:  }
+
+! minval with array mask argument
+subroutine minval4(a, s, m)
+  integer :: a(:), s
+  logical :: m(:)
+  s = MINVAL(a, m)
+end subroutine
+! CHECK-LABEL: func.func @_QPminval4(
+! 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.minval %[[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:  }
+
+! minval with all 3 arguments, dim is by-val, array isn't boxed
+subroutine minval5(s)
+  integer :: s(2)
+  integer :: a(2,2) = reshape((/1, 2, 3, 4/), [2,2])
+  s = minval(a, 1, .true.)
+end subroutine
+! CHECK-LABEL: func.func @_QPminval5
+! 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.minval %[[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 minval6(a, s, d)
+  integer, pointer :: d
+  real :: a(:,:), s(:)
+  s = minval(a, (d))
+end subroutine
+! CHECK-LABEL: func.func @_QPminval6(
+! 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.minval %[[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 MINVAL for character
+subroutine minval7(a, s)
+  character(*) :: a(:), s
+  s = MINVAL(a)
+end subroutine
+! CHECK-LABEL: func.func @_QPminval7(
+! 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.minval %[[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:  }
+
+! minval for character with by-ref DIM argument
+subroutine minval8(a, s, d)
+  character(*) :: a(:,:), s(:)
+  integer :: d
+  s = MINVAL(a, d)
+end subroutine
+! CHECK-LABEL: func.func @_QPminval8(
+! 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.minval %[[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:  }
+
+! minval for character with scalar mask argument
+subroutine minval9(a, s, m)
+  character(*) :: a(:), s
+  logical :: m
+  s = MINVAL(a, m)
+end subroutine
+! CHECK-LABEL: func.func @_QPminval9(
+! 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.minval %[[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 = MINVAL(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:    %[[MINVAL:.*]] = hlfir.minval %[[ARRAY]]#0 mask %[[SELECT]]
+! CHECK-NEXT:    hlfir.assign %[[MINVAL]] to %[[RES]]#0
+! CHECK-NEXT:    return
+! CHECK-NEXT:  }
+
+subroutine testAllocatableArray(array, mask, res)
+  integer, allocatable :: array(:)
+  integer :: res
+  logical :: mask(:)
+  res = MINVAL(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:    %[[MINVAL:.*]] = hlfir.minval %[[LOADED_ARRAY]] mask %[[MASK]]#0
+! CHECK-NEXT:    hlfir.assign %[[MINVAL]] to %[[RES]]#0
+! CHECK-NEXT:    return
+! CHECK-NEXT:  }
+
+function testOptionalScalar(array, mask)
+  integer :: array(:)
+  logical, optional :: mask
+  integer :: testOptionalScalar
+  testOptionalScalar = minval(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.minval %[[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.minval 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 = minval(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.minval %[[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:    }