[llvm-dev] Optimised stack direction?

Tim Northover via llvm-dev llvm-dev at lists.llvm.org
Tue Jun 25 05:24:22 PDT 2019

On Tue, 25 Jun 2019 at 13:22, Tim Northover <t.p.northover at gmail.com> wrote:
> The only way I can think of to reliably detect the direction is using
> an __attribute__((noinline)) function to compare locals from two
> different, nested frames (even that's iffy though on a semantic
> level). If there turned out to be a compelling enough use-case, an
> intrinsic could be added to get the result more efficiently.

Actually, (uintptr_t)__builtin_frame_address(0) <
(uintptr_t)__builtin_frame_address(1) would probably work too.



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