SYangDong commented on pull request #9436:
URL: https://github.com/apache/tvm/pull/9436#issuecomment-958668046
@comaniac Thank you for your explaination. IMHO, entry function is a
relative concept. Relative to host funciton，the device function is not entry
function，definitely. But when having __device__ function and __global__
fucntion, the global function is the entry function of the device function.
Maybe I misuse the tag entry_function. Take the code below for example:
```A = te.var('A')
B = te.var('B')
callee = tir.PrimFunc([A, B], tir.Evaluate(tir.Add(A, B)))
callee = callee.with_attr('global_symbol', 'callee')
main = tir.PrimFunc([A, B], tir.Evaluate(tir.Call('int32', callee, [A, B])))
# OR main = tir.PrimFunc([A, B], tir.Evaluate(tir.Call('int32',
GlobalVar('callee'), [A, B])))
main = main.with_attr("global_symbol", "main")
main = main.with_attr("tir.noalias", True)
mod = tvm.IRModule({"main": main, "callee": callee})
tvm.build(mod)
```
So if I add a tag of the main function, tvm can generate the "__global__
void" adn "__device__ void" correspondingly.
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