Update fortran90.html.markdown

added DO CONCURRENT

fortran90.html.markdown

@@ -436,6 +436,34 @@ contains
 
 end module fruity
 
+
+! ISO Standard Fortran 2008 introduced the DO CONCURRENT construct to allow you to express loop-level parallelism
+
+integer :: i
+real :: array(100)
+
+DO CONCURRENT (i = 1:size(array))
+    array(i) = sqrt(i**i)
+END DO
+
+
+! Only calls to pure functions are allowed inside the loop and we can declare multiple indices:
+
+integer :: x, y
+real :: array(8, 16)
+
+do concurrent (x = 1:size(array, 1), y = 1:size(array, 2))
+    array(x, y) = real(x)
+end do
+
+! loop indices can also declared inside the contruct:
+
+real :: array(8, 16)
+
+do concurrent (integer :: x = 1:size(array, 1), y = 1:size(array, 2))
+    array(x, y) = real(x)
+end do
+
 ```
 
 ### More Resources