https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69575
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2016-01-31 Ever confirmed|0 |1 --- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> --- Since we can't assume the direction flag in interrupt handler, we must emit cld instruction if stringops are used in interrupt handler or interrupt handler isn't a leaf function.