corrections to shift_down and is_overflow, test "1.0 + 2.0 == 3.0" works
-rw-r--r-- 119 .gitmodules
-rw-r--r-- 65 Makefile
-rw-r--r-- 139 README.md
m--------- - berkeley-softfloat-3
drwxr-xr-x - src