[Bug c/66271] -Os generates incorrect code on ARM possibly due to IPA

[gccbugs at rooted dot tk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66271

--- Comment #2 from gccbugs at rooted dot tk ---
Created attachment 35610
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35610&action=edit
correct code with -O2