https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80632
Bug ID: 80632 Summary: error: invalid PHI argument with -O2 Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: dcb314 at hotmail dot com Target Milestone: --- Created attachment 41320 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41320&action=edit C source code The attached code does this with today's gcc trunk and flag -O2: $ /home/dcb/gcc/results/bin/gcc -c -w -O2 /tmp/q.i xlock.c: In function ‘monitor_powered_on_p’: xlock.c:4059:1: error: invalid PHI argument } ^ .MEM xlock.c:4059:1: error: invalid PHI argument .MEM .MEM_7 = PHI <.MEM_11(2), .MEM_12(3), .MEM_13(4), .MEM(11), .MEM(10)> xlock.c:4059:1: internal compiler error: verify_gimple failed 0xc860d2 verify_gimple_in_cfg(function*, bool) ../../trunk/gcc/tree-cfg.c:5266 0xb12976 execute_function_todo ../../trunk/gcc/passes.c:1968 0xb14f61 do_per_function ../../trunk/gcc/passes.c:1652