tree 0868e1c5811d935e85ccb9f527a71daecd1c406a
parent 8f760302b5490d1b4a6307d4609b8d38c1a593af
author Ken MacKay <kmackay@gmail.com> 1442183716 -0700
committer Ken MacKay <kmackay@gmail.com> 1444710597 -0700

Some work on fixing ARM asm for Xcode compiler

The Xcode compiler (some version of clang, I guess) doesn't handle adc
instructions properly. Specifically it can't handle the 2-argument version
if one of the registers is a hi reg and it is in Thumb mode; it thinks that
it needs to use a 16-bit instruction only, and errors out. By explicitly
using the 3-argument version of adc, we can trick it into working correctly.