[flang][openacc] Support ieor reduction operator

[clementval]

Summary

Add support for ieor reduction operator in
OpenACC lowering.

Depends on D154887

[razvanlupusoru]

Looks great!

flang/lib/Lower/OpenACC.cpp

 static mlir::Value genReductionInitValue(fir::FirOpBuilder &builder,
                                          mlir::Location loc, mlir::Type ty,
                                          mlir::acc::ReductionOperator op) {
   if (op != mlir::acc::ReductionOperator::AccAdd &&
       op != mlir::acc::ReductionOperator::AccMul &&
       op != mlir::acc::ReductionOperator::AccMin &&
       op != mlir::acc::ReductionOperator::AccMax &&
       op != mlir::acc::ReductionOperator::AccIand &&
-      op != mlir::acc::ReductionOperator::AccIor)
+      op != mlir::acc::ReductionOperator::AccIor &&
+      op != mlir::acc::ReductionOperator::AccXor)
     TODO(loc, "reduction operator");
 
   if (ty.isIntOrIndex())
     return builder.create<mlir::arith::ConstantOp>(
         loc, ty,
         builder.getIntegerAttr(ty, getReductionInitValue<llvm::APInt>(op, ty)));
   if (op == mlir::acc::ReductionOperator::AccMin ||
       op == mlir::acc::ReductionOperator::AccMax) {
if (op == mlir::acc::ReductionOperator::AccMax)
     return fir::genMax(builder, loc, {value1, value2});
 
   if (op == mlir::acc::ReductionOperator::AccIand)
     return builder.create<mlir::arith::AndIOp>(loc, value1, value2);
 
   if (op == mlir::acc::ReductionOperator::AccIor)
     return builder.create<mlir::arith::OrIOp>(loc, value1, value2);
 
+  if (op == mlir::acc::ReductionOperator::AccXor)
+    return builder.create<mlir::arith::XOrIOp>(loc, value1, value2);
+
   TODO(loc, "reduction operator");
 }
 
 mlir::acc::ReductionRecipeOp Fortran::lower::createOrGetReductionRecipe(
     fir::FirOpBuilder &builder, llvm::StringRef recipeName, mlir::Location loc,
     mlir::Type ty, mlir::acc::ReductionOperator op) {
   mlir::ModuleOp mod =
       builder.getBlock()->getParent()->getParentOfType<mlir::ModuleOp>();

flang/test/Lower/OpenACC/acc-reduction.f90

 ! This test checks lowering of OpenACC reduction clause.
 
 ! RUN: bbc -fopenacc -emit-fir %s -o - | FileCheck %s
 
+! CHECK-LABEL: acc.reduction.recipe @reduction_xor_i32 : i32 reduction_operator <xor> init {
+! CHECK: ^bb0(%{{.*}}: i32):
+! CHECK:   %[[CST:.*]] = arith.constant 0 : i32
+! CHECK:   acc.yield %[[CST]] : i32
+! CHECK: } combiner {
+! CHECK: ^bb0(%[[ARG0:.*]]: i32, %[[ARG1:.*]]: i32):
+! CHECK:   %[[COMBINED:.*]] = arith.xori %[[ARG0]], %[[ARG1]] : i32
+! CHECK:   acc.yield %[[COMBINED]] : i32
+! CHECK: }
+
 ! CHECK-LABEL: acc.reduction.recipe @reduction_ior_i32 : i32 reduction_operator <ior> init {
 ! CHECK: ^bb0(%{{.*}}: i32):
 ! CHECK:   %[[CST:.*]] = arith.constant 0 : i32
 ! CHECK:   acc.yield %[[CST]] : i32
 ! CHECK: } combiner {
 ! CHECK: ^bb0(%[[ARG0:.*]]: i32, %[[ARG1:.*]]: i32):
 ! CHECK:   %[[COMBINED:.*]] = arith.ori %[[ARG0]], %[[ARG1]] : i32
 ! CHECK:   acc.yield %[[COMBINED]] : i32
subroutine acc_reduction_ior()
   integer :: i
   !$acc parallel reduction(ior:i)
   !$acc end parallel
 end subroutine
 
 ! CHECK-LABEL: func.func @_QPacc_reduction_ior()
 ! CHECK: %[[RED:.*]] = acc.reduction varPtr(%{{.*}} : !fir.ref<i32>)   -> !fir.ref<i32> {name = "i"}
 ! CHECK: acc.parallel reduction(@reduction_ior_i32 -> %[[RED]] : !fir.ref<i32>)
+
+subroutine acc_reduction_ieor()
+  integer :: i
+  !$acc parallel reduction(ieor:i)
+  !$acc end parallel
+end subroutine
+
+! CHECK-LABEL: func.func @_QPacc_reduction_ieor()
+! CHECK: %[[RED:.*]] = acc.reduction varPtr(%{{.*}} : !fir.ref<i32>) -> !fir.ref<i32> {name = "i"}
+! CHECK: acc.parallel reduction(@reduction_xor_i32 -> %[[RED]] : !fir.ref<i32>)