Statements

Control flow statements

Hidet script supports the following control flow statements:

• if statement

• for statement - for-mapping statement - while statement

If statement

The if statement has the same semantics as the if statement in c/c++ and python.

For statement

Hidet script supports the following kinds of for statements:

from hidet.lang import grid, printf

for i in range(10):
    printf("%d\n", i)

for i, j in grid(10, 10):
    printf("%d %d\n", i, j)

for indices in grid(10, 10, bind_tuple=True):
    printf("%d %d\n", indices[0], indices[1])

# explicitly set the attributes of the loop variables
# the attribute can be one of
# - 'p': parallelize this loop axis
# - 'u': unroll this loop axis
# a number can be appended to the attribute to specify how many threads to use or the unroll factor
# like 'p2u3' means parallelize loop axis 'i' with 2 threads and unroll loop axis 'j' with factor 3.
for i, j in grid(10, 10, attrs='pu'):
    printf("%d %d\n", i, j)

For mapping statement

Task mapping

Please refer to the Hidet paper for the definition of task mapping

Todo

add a brif introduction here to make it self-contained

Iterate the task mapping

The task mappings are defined in the hidet.lang.mapping module. To use the task mappings, we can import the module and use the task mappings like the following:

from hidet.lang import printf, grid
from hidet.lang.mapping import spatial, repeat

# iterate the spatial mapping
for w in grid(10, attrs='p'):
    for i, j in spatial(2, 5).on(w):
        printf("%d %d\n", i, j)

    for i, j in spatial(2, 5).repeat(3, 4).on(w):
        # task mapping shape: (6, 20)
        # num workers: 10
        printf("%d %d\n", i, j)

While statement

Hidet also supports the while statement, and it has the same semantics as python and c/c++.