https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81791
Bug ID: 81791
Summary: [8 Regression] ICE in
cfg_layout_redirect_edge_and_branch, at cfgrtl.c:4422
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
Target Milestone: ---
Starting from r250360, we probably exposed a latent bug:
$ g++ /home/marxin/Programming/gcc/gcc/testsuite/g++.dg/opt/pr47355.C -O2
-fmodulo-sched
during RTL pass: sms
/home/marxin/Programming/gcc/gcc/testsuite/g++.dg/opt/pr47355.C: In function
‘void foo()’:
/home/marxin/Programming/gcc/gcc/testsuite/g++.dg/opt/pr47355.C:39:1: internal
compiler error: in cfg_layout_redirect_edge_and_branch, at cfgrtl.c:4422
}
^
0x95cb2e cfg_layout_redirect_edge_and_branch
../../gcc/cfgrtl.c:4422
0x95cb58 cfg_layout_redirect_edge_and_branch_force
../../gcc/cfgrtl.c:4432
0x9475c3 redirect_edge_and_branch_force(edge_def*, basic_block_def*)
../../gcc/cfghooks.c:474
0x9481c9 make_forwarder_block(basic_block_def*, bool (*)(edge_def*), void
(*)(basic_block_def*))
../../gcc/cfghooks.c:892
0x9558f3 create_preheader(loop*, int)
../../gcc/cfgloopmanip.c:1534
0x955b3e create_preheaders(int)
../../gcc/cfgloopmanip.c:1585
0xbf55de apply_loop_flags
../../gcc/loop-init.c:64
0xbf60bc loop_optimizer_init(unsigned int)
../../gcc/loop-init.c:123
0x1589322 sms_schedule
../../gcc/modulo-sched.c:1351
0x1589322 execute
../../gcc/modulo-sched.c:3342
