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import halide as hl
test_exterior = 42
test_min = -25
test_extent = 100
x, y = hl.vars("x y")
def expect_eq(actual, expected):
assert expected == actual, f"Failed: expected {expected}, actual {actual}"
def schedule_test(f, vector_width, target, partition_policy):
if vector_width != 1:
f.vectorize(x, vector_width)
f.partition(x, partition_policy)
f.partition(y, partition_policy)
if target.has_gpu_feature() and vector_width <= 16:
xo, yo, xi, yi = hl.vars("xo yo xi yi")
f.gpu_tile(x, y, xo, yo, xi, yi, 2, 2)
def realize_and_check(
f,
checker,
input,
test_min_x,
test_extent_x,
test_min_y,
test_extent_y,
vector_width,
target,
partition_policy,
):
result = hl.Buffer(hl.UInt(8), [test_extent_x, test_extent_y])
result.set_min([test_min_x, test_min_y])
f2 = hl.lambda_func(x, y, f[x, y])
schedule_test(f2, vector_width, target, partition_policy)
f2.realize(result, target)
result.copy_to_host()
for r in range(test_min_y, test_min_y + test_extent_y):
for c in range(test_min_x, test_min_x + test_extent_x):
checker(input, result, c, r)
def check_constant_exterior(input, result, c, r):
if c < 0 or r < 0 or c >= input.width() or r >= input.height():
expect_eq(result[c, r], test_exterior)
else:
expect_eq(result[c, r], input[c, r])
def check_repeat_edge(input, result, c, r):
clamped_y = min(input.height() - 1, max(0, r))
clamped_x = min(input.width() - 1, max(0, c))
expect_eq(result[c, r], input[clamped_x, clamped_y])
def check_repeat_image(input, result, c, r):
mapped_x = c
mapped_y = r
while mapped_x < 0:
mapped_x += input.width()
while mapped_x > input.width() - 1:
mapped_x -= input.width()
while mapped_y < 0:
mapped_y += input.height()
while mapped_y > input.height() - 1:
mapped_y -= input.height()
expect_eq(result[c, r], input[mapped_x, mapped_y])
def check_mirror_image(input, result, c, r):
mapped_x = -(c + 1) if c < 0 else c
mapped_x = mapped_x % (2 * input.width())
if mapped_x > (input.width() - 1):
mapped_x = (2 * input.width() - 1) - mapped_x
mapped_y = -(r + 1) if r < 0 else r
mapped_y = mapped_y % (2 * input.height())
if mapped_y > (input.height() - 1):
mapped_y = (2 * input.height() - 1) - mapped_y
expect_eq(result[c, r], input[mapped_x, mapped_y])
def check_mirror_interior(input, result, c, r):
mapped_x = abs(c) % (input.width() * 2 - 2)
if mapped_x > input.width() - 1:
mapped_x = input.width() * 2 - 2 - mapped_x
mapped_y = abs(r) % (input.height() * 2 - 2)
if mapped_y > input.height() - 1:
mapped_y = input.height() * 2 - 2 - mapped_y
expect_eq(result[c, r], input[mapped_x, mapped_y])
def test_all(vector_width, target, partition_policy):
# print("target is %s, partition_policy is %s " % (str(target), str(partition_policy)))
W = 32
H = 32
input = hl.Buffer(hl.UInt(8), [W, H])
for r in range(H):
for c in range(W):
input[c, r] = (c + r * W) & 0xFF
input_f = hl.Func()
input_f[x, y] = input[x, y]
tests = [
(hl.BoundaryConditions.constant_exterior, check_constant_exterior),
(hl.BoundaryConditions.repeat_edge, check_repeat_edge),
(hl.BoundaryConditions.repeat_image, check_repeat_image),
(hl.BoundaryConditions.mirror_image, check_mirror_image),
(hl.BoundaryConditions.mirror_interior, check_mirror_interior),
]
for bc, checker in tests:
# print(' Testing %s:%d...' % (bc.__name__, vector_width))
func_input_args = {"f": input_f, "bounds": [(0, W), (0, H)]}
image_input_args = {"f": input, "bounds": [(0, W), (0, H)]}
undef_min_args = {"f": input, "bounds": [(hl.Expr(), hl.Expr()), (0, H)]}
undef_max_args = {"f": input, "bounds": [(0, W), (hl.Expr(), hl.Expr())]}
implicit_bounds_args = {"f": input}
if bc == hl.BoundaryConditions.constant_exterior:
func_input_args["exterior"] = test_exterior
image_input_args["exterior"] = test_exterior
undef_min_args["exterior"] = test_exterior
undef_max_args["exterior"] = test_exterior
implicit_bounds_args["exterior"] = test_exterior
realize_and_check(
bc(**func_input_args),
checker,
input,
test_min,
test_extent,
test_min,
test_extent,
vector_width,
target,
partition_policy,
)
realize_and_check(
bc(**image_input_args),
checker,
input,
test_min,
test_extent,
test_min,
test_extent,
vector_width,
target,
partition_policy,
)
realize_and_check(
bc(**undef_min_args),
checker,
input,
0,
W,
test_min,
test_extent,
vector_width,
target,
partition_policy,
)
realize_and_check(
bc(**undef_max_args),
checker,
input,
test_min,
test_extent,
0,
H,
vector_width,
target,
partition_policy,
)
realize_and_check(
bc(**implicit_bounds_args),
checker,
input,
test_min,
test_extent,
test_min,
test_extent,
vector_width,
target,
partition_policy,
)
if __name__ == "__main__":
target = hl.get_jit_target_from_environment()
vector_width_power_max = 6
# https://github.com/halide/Halide/issues/2148
if (
target.has_feature(hl.TargetFeature.Metal)
or target.has_feature(hl.TargetFeature.Vulkan)
or target.has_feature(hl.TargetFeature.D3D12Compute)
):
vector_width_power_max = 2
for i in range(0, vector_width_power_max):
vector_width = 1 << i
test_all(vector_width, target, hl.Partition.Auto)
test_all(vector_width, target, hl.Partition.Never)
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