Light-of-Hers edited a comment on issue #6884:
URL: https://github.com/apache/incubator-tvm/issues/6884#issuecomment-723707565
@tqchen Here is an example. The `int8` vectorized scatter operation may
cause such problem.
```python
import tvm
from tvm import te
N = 128
A = te.placeholder((N, N * 8), name="A", dtype="int8")
B = te.compute((N, N), lambda i, j: A[i, j * 8], name="B")
s = te.create_schedule(B.op)
i, j = s[B].op.axis
s[B].bind(i, te.thread_axis("blockIdx.x"))
jo, ji = s[B].split(j, nparts=2)
s[B].reorder(i, ji, jo)
s[B].vectorize(jo)
mod = tvm.lower(s, [A, B])
func = tvm.build(mod, target="opencl")
print(func.imported_modules[0].get_source())
```
The generated opencl code is:
```opencl
__kernel void main_kernel0(__global char* restrict B, __global char*
restrict A) {
for (int j_inner = 0; j_inner < 64; ++j_inner) {
int2 _1 = (int2)((((((int)get_group_id(0)) * 128) + j_inner))+(64*0),
(((((int)get_group_id(0)) * 128) + j_inner))+(64*1));
int2 _2 = (int2)((((((int)get_group_id(0)) * 1024) + (j_inner *
8)))+(512*0), (((((int)get_group_id(0)) * 1024) + (j_inner * 8)))+(512*1));
char2 _3 = (0x000000ff << 0) & (A[_2.s0] << 0))|((0x000000ff << 8) &
(A[_2.s1] << 8);
B[_1.s0] = _3.s0;
B[_1.s1] = _3.s1;
}
}
```
Obviously `char2 _3 = (0x000000ff << 0) & (A[_2.s0] << 0))|((0x000000ff <<
8) & (A[_2.s1] << 8)` has unmatched brackets.
The solution is simple. Just removing the if-branches in
`CodeGenC::PrintSSAAssign` is okay, like:
```C++
void CodeGenC::PrintSSAAssign(const std::string& target, const std::string&
src, DataType t) {
PrintType(t, stream);
stream << ' ' << target << " = ";
// if (src.length() > 3 && src[0] == '(' && src[src.length() - 1] == ')') {
// stream << src.substr(1, src.length() - 2);
// } else {
// stream << src;
// }
stream << src;
stream << ";\n";
}
```
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