[PATCH] D144541: [X86] Save/restore base pointer register when it is clobbered

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

> Why it would mess unwinding?

I meant fp-based unwinding for profiling etc., not DWARF unwind.

> That register (other register) may also be clobbered in another inline asm

We don't have to use the same register for each inline asm.

> Don't know what ech cif_escape means

llvm-readobj --unwind can decode the DWARF for you.

The important thing is that it allocates a variable amount of space between the arguments and the frame pointer, and saves the incoming value of esp on the stack.


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  https://reviews.llvm.org/D144541/new/

https://reviews.llvm.org/D144541