[PATCH] D39700: [Builtins] Do not use tailcall for Thumb1

[Peter Smith via Phabricator via llvm-commits]

peter.smith added a comment.

With respect to this review specifically, I think that the change should make compiler-rt no worse and for its likely use case of v6-m, there aren't any non-core registers for the C language functions to corrupt. With respect to the larger problem of many of the other __aeabi_ functions calling C functions I think we should address separately to this Review. I have raised pr35243 to cover the non-compliance https://bugs.llvm.org/show_bug.cgi?id=35243 please feel to comment/correct as necessary.


https://reviews.llvm.org/D39700