[flang][cuda] Allow complex type in cuf kernel reduce (#124185)

Author: clementval

flang/lib/Semantics/check-cuda.cpp

@@ -553,7 +553,8 @@ static void CheckReduce(
         case parser::ReductionOperator::Operator::Multiply:
         case parser::ReductionOperator::Operator::Max:
         case parser::ReductionOperator::Operator::Min:
-          isOk = cat == TypeCategory::Integer || cat == TypeCategory::Real;
+          isOk = cat == TypeCategory::Integer || cat == TypeCategory::Real ||
+              cat == TypeCategory::Complex;
           break;
         case parser::ReductionOperator::Operator::Iand:
         case parser::ReductionOperator::Operator::Ior:

flang/test/Semantics/reduce.cuf

@@ -1,12 +1,14 @@
 ! RUN: %python %S/test_errors.py %s %flang_fc1
-subroutine s(n,m,a,l)
+subroutine s(n,m,a,l,c)
   integer, intent(in) :: n
   integer, device, intent(in) :: m(n)
   real, device, intent(in) :: a(n)
   logical, device, intent(in) :: l(n)
   integer j, mr
   real ar
   logical lr
+  complex :: cr
+  complex, device, intent(in) :: c(n)
 !$cuf kernel do <<<*,*>>> reduce (+:mr,ar)
   do j=1,n; mr = mr + m(j); ar = ar + a(j); end do
 !ERROR: !$CUF KERNEL DO REDUCE operation is not acceptable for a variable with type LOGICAL(4)
@@ -69,4 +71,6 @@ subroutine s(n,m,a,l)
 !ERROR: !$CUF KERNEL DO REDUCE operation is not acceptable for a variable with type REAL(4)
 !$cuf kernel do <<<*,*>>> reduce (.or.:mr,ar)
   do j=1,n; end do
+!$cuf kernel do <<<*,*>>> reduce (+:cr) ! ok complex type
+  do j=1,n; cr = cr + c(j); end do
 end