[Bug rtl-optimization/66444] [5/6 Regression] Miscompilation of Xen since r211078

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66444

--- Comment #4 from vries at gcc dot gnu.org ---
Created attachment 35713
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35713&action=edit
tentative patch with testcase