[PATCH] D66278: [RISCV] Enable tail call opt for variadic function

[Bruce Hoult via Phabricator via llvm-commits]

brucehoult added a comment.

In D66278#1652021 <https://reviews.llvm.org/D66278#1652021>, @Jim wrote:

> It can focus on whether the stack frame is created and not yet freed before the function call
>  for saving saved register or passing parameters or others.


When you have a function in tail position with arguments that fit in registers the stack frame can *always* be freed first, because by definition the onward argument values and return address and address of the function to be called are the ONLY values in the function that are live.


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https://reviews.llvm.org/D66278