[PATCH] D31220: [builtins][ARM] Select correct code fragments when compiling for Thumb1/Thum2/ARM ISA

[Peter Smith via Phabricator via llvm-commits]

peter.smith added a comment.

I'm happy with the changes, probably best to wait for compnerd to approve though.

Although not for this patch. On older pre cortex cores such as the ARM1176JF-S (used in the original raspberry pi) that have Thumb but not Thumb2, and crucially not the v6m system extensions, it may be better to switch to ARM state for performance critical functions. Alternatively compiler-rt could always be compiled entirely in ARM state.


https://reviews.llvm.org/D31220