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

Sat Feb 25 16:30:12 PST 2023

LuoYuanke added a comment.

In D144541#4152619 <https://reviews.llvm.org/D144541#4152619>, @efriedma wrote:

> What happens if an inline asm both has a memory reference, and clobbers the base pointer?  How do we refer to memory?

That's a good question. Maybe exchange ebp and esi. Base pointer (esi) is used to reference the stack slot before realignment and frame pointer (ebp) is used to reference stack slot after realignment. Since ebp is reserved in ABI, user can not clobber ebp in inline assembly. What do you think?

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https://reviews.llvm.org/D144541