[LLVMdev] NVPTX: why ret instruction is not translated to exit in kernel function?

[Yabin Hu]

Hi Justin,

In the PTX backend, "ret" instruction at the end of a ptx_kernel function
is translated to "exit" instruction. A test case named exit.ll demos this.
But in the NVPTX backend, it seems that you didn't do such a translation.
 Why do you choose this? Is this due to the changes of the NVIDA PTX itself?

Thanks,

Yabin
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