https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81803
--- Comment #8 from James Cowgill <jcowgill+gcc at jcowgill dot uk> --- Created attachment 42072 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42072&action=edit testcase-c Here is another smaller testcase which was manually created. It works by using asm to clobber all the registers and passing -ffixed for the saved registers to force a stack spill and trigger the bug. Compile with: > gcc -S -O2 -fstack-protector-strong -ffixed-s0 -ffixed-s1 -ffixed-s2 > -ffixed-s3 -ffixed-s4 -ffixed-s5 -ffixed-s6 -ffixed-s7 test.c