[PATCH] D92695: [X86ISelLowering] don't emit frame pointers for eflags intrinsics.

[Nick Desaulniers via Phabricator via llvm-commits]

nickdesaulniers added a comment.

In D92695#2435063 <https://reviews.llvm.org/D92695#2435063>, @nickdesaulniers wrote:

> In D92695#2435025 <https://reviews.llvm.org/D92695#2435025>, @craig.topper wrote:
>
>> Maybe the linux kernel disables the red zone and this isn't a problem.
>
> The x86_64 (64b) Linux kernel is built with `-mno-red-zone`; I'm not sure if that's precisely the same as "disables the red zone."

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6ba0efa46047936afa81460489cfd24bc95dd863 has a little more context about the kernel's constraints.  https://stackoverflow.com/questions/25787408/why-cant-kernel-code-use-a-red-zone has more interesting discussion as well.


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