https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93264
Bug ID: 93264
Summary: [10 Regression] ICE in
cfg_layout_redirect_edge_and_branch_force, at
cfgrtl.c:4522
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zhroma at gcc dot gnu.org
Blocks: 90040
Target Milestone: ---
Opening bug 90040 comment 2 as a separate regression PR to achieve more
attention to the issue. As modulo-scheduler maintainer I cannot solve it,
issue happens early in the pass when loop_optimizer_init is called after bbro
finished its job. There are much more discussion in the meta-bug itself
(PR90040).
Although I'm pretty sure this was latent before, technically, since r10-4447 we
have a regression (ICE on valid code):
$ aarch64-unknown-linux-gnueabi-gcc -O3 -fomit-frame-pointer -funroll-loops
-fpeel-loops -ftracer -finline-functions -fmodulo-sched
-freorder-blocks-and-partition -S gcc/testsuite/gcc.c-torture/execute/pr71550.c
gcc/testsuite/gcc.c-torture/execute/pr71550.c: In function 'main':
gcc/testsuite/gcc.c-torture/execute/pr71550.c:26:1: internal compiler error: in
cfg_layout_redirect_edge_and_branch_force, at cfgrtl.c:4522
26 | }
| ^
0xb4a9d9 cfg_layout_redirect_edge_and_branch_force
/mnt/scratch/zhroma/gcc/src/master/gcc/cfgrtl.c:4522
0xb2e57d redirect_edge_and_branch_force(edge_def*, basic_block_def*)
/mnt/scratch/zhroma/gcc/src/master/gcc/cfghooks.c:490
0xb2f2fe make_forwarder_block(basic_block_def*, bool (*)(edge_def*), void
(*)(basic_block_def*))
/mnt/scratch/zhroma/gcc/src/master/gcc/cfghooks.c:897
0xb33214 merge_latch_edges
/mnt/scratch/zhroma/gcc/src/master/gcc/cfgloop.c:780
0xb33314 disambiguate_multiple_latches
/mnt/scratch/zhroma/gcc/src/master/gcc/cfgloop.c:831
0xb3335d disambiguate_loops_with_multiple_latches()
/mnt/scratch/zhroma/gcc/src/master/gcc/cfgloop.c:844
0xf1d3d0 apply_loop_flags
/mnt/scratch/zhroma/gcc/src/master/gcc/loop-init.c:54
0xf1d539 loop_optimizer_init(unsigned int)
/mnt/scratch/zhroma/gcc/src/master/gcc/loop-init.c:123
0x1f339f6 sms_schedule
/mnt/scratch/zhroma/gcc/src/master/gcc/modulo-sched.c:1350
0x1f38a16 execute
/mnt/scratch/zhroma/gcc/src/master/gcc/modulo-sched.c:3341
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90040
[Bug 90040] [meta-bug] modulo-scheduler and partitioning issues
