[Bug] Wrong results of `cast<int32>( cast<bool>(-1i64) )`

[ganler]

Expected behavior

cast<int32>( cast<bool>(-1i64) ) should be 1.

Actual behavior

cast<int32>( cast<bool>(-1i64) ) returns wrong results (i.e., -1) in optimized graph runtime.

Environment

fa17da2 on Ubuntu 20.04.

Steps to reproduce

Preferably a minimal script to cause the issue to occur.

import tvm
from tvm import relay
import numpy as np

i0 = relay.var("i0", shape=(1,), dtype="int64")
cast_bool = relay.cast(i0, "bool")
cast_int32 = relay.cast(cast_bool, "int32")

f = relay.Function([i0], cast_int32)
input = np.array([-1], dtype="int64")
opt_res = relay.create_executor("graph", device=tvm.cpu()).evaluate(f)(input)
debug_res = relay.create_executor("debug", device=tvm.cpu()).evaluate(f)(input)
print(f"debug_res: \t{debug_res}") # [-1]
print(f"opt_res: \t{opt_res}")     # [1]

Triage

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• needs-triage