[LLVMdev] Question about PTXFrameLowering

[Lei Mou]

Hi all,

I'm learning the PTX backend and confused by the following problem. In the
constructor of PTXFrameLowering, StackAlignment and LocalAreaOffset are
assigned 2 and -2, respectively. Since PTX has neither stack frame nor
stack pointer, why StackAlignment and LocalAreaOffset are needed and where
does 2 and -2 come from? Any explanation is appreciated. Thank you in
advance!

Yours Sincerely,
Lei Mou
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