[PATCH] D62686: [RISCV] Add support for save/restore of callee-saved registers via libcalls

[Ana Pazos via Phabricator via llvm-commits]

apazos added a comment.



> Is it worth trying to disallow tail call optimization completely if this flag is enabled? I'm not sure what GCC does exactly. but this seems to be the behaviour.

I had reported above that I have already run that test:  with "-fno-optimize-sibling-calls -msave-restore", i.e., disabling tail calls when m-save-restore is enabled.

But it seems a better solution is to optimistically apply -msave-restore when there are no tail calls of any type in a function,  instead of disabling tail calls completed. Let tail call optimization prevail over msave-restore. No LLVM target is disabling tail calls.

So you can update the patch according to this solution plan.


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https://reviews.llvm.org/D62686