Floodable regions are used to declare and manipulate floodable arrays (See Section 3.7.2). A floodable region has one or more absent dimensions, as indicated by an asterisk:
region FR = [*, 1..n]; -- FR is a floodable region; 1st dimension is absentThe absent dimension's bounds are unspecified, and logically represents every possible index value from negative infinity to positive infinity. Arrays that are declared using floodable regions have data replicated across all absent dimensions.