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# Test boundary conditions for various architectures
SET_TEMPLATE = """
@micropython.viper
def set{off}(dest: ptr32):
saved = dest
dest[{off}] = {val}
assert int(saved) == int(dest)
set{off}(buffer)
print(hex(get_index(buffer, {off})))
"""
BIT_THRESHOLDS = (5, 8, 11, 12)
SIZE = 4
MASK = (1 << (8 * SIZE)) - 1
@micropython.viper
def set_index(dest: ptr32, i: int, val: uint):
saved = dest
dest[i] = val
assert int(saved) == int(dest)
def get_index(src, i):
return (
src[i * SIZE]
+ (src[(i * SIZE) + 1] << 8)
+ (src[(i * SIZE) + 2] << 16)
+ (src[(i * SIZE) + 3] << 24)
)
buffer = bytearray(((1 << max(BIT_THRESHOLDS) + 1) // 1024) * 1024)
next = 1
val = 0
for bit in BIT_THRESHOLDS:
print("---", bit)
pre, idx, post = (
(((1 << bit) - (2 * SIZE)) // SIZE),
(((1 << bit) - (1 * SIZE)) // SIZE),
((1 << bit) // SIZE),
)
val = (val << 8) + next
next += 1
set_index(buffer, pre, val & MASK)
val = (val << 8) + next
next += 1
set_index(buffer, idx, val & MASK)
val = (val << 8) + next
next += 1
set_index(buffer, post, val & MASK)
val = (val << 8) + next
next += 1
print(hex(get_index(buffer, pre)), hex(get_index(buffer, idx)), hex(get_index(buffer, post)))
exec(SET_TEMPLATE.format(off=pre, val=val & MASK))
val = (val << 8) + next
next += 1
exec(SET_TEMPLATE.format(off=idx, val=val & MASK))
val = (val << 8) + next
next += 1
exec(SET_TEMPLATE.format(off=post, val=val & MASK))
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