[Bug other/67648] No need to save callee-saved registers in interrupt handler

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67648

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
I checked a fix into hjl/interrupt/master branch:

https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=b21f445ed3e067ac1b401798b953a1ec5b093202

Please take a look.