use fast version of the int reading code for the high-order digits too
[musl] / crt /
drwxr-xr-x   ..
drwxr-xr-x - arm
-rw-r--r-- 0 crt1.c
-rw-r--r-- 0 crti.c
-rw-r--r-- 0 crtn.c
drwxr-xr-x - i386
drwxr-xr-x - x86_64