Messages in this thread | | | From | Andreas Schwab <> | Subject | Re: [PATCH] riscv: eliminate unreliable __builtin_frame_address(1) | Date | Wed, 19 Jan 2022 22:07:39 +0100 |
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On Jan 19 2022, Jessica Clarke wrote:
> My point is that the only thing that can possibly read the incoming > frame pointer of a leaf function is the leaf function itself, and since > it knows where it’s putting it then there is no ABI issue, it just > remembers where it put it and loads it from there.
llvm sidesteps that issue by always saving ra when creating a frame, even in a leaf function, so it can use a constant offset.
-- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."
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