Using following git branch: https://github.com/marxin/gecko-dev/tree/lto-stable-2 and r267935 of GCC I see following ICE in profile_use phase: 108:40.08 /home/marxin/Programming/gecko-dev/js/src/vm/JSAtom.cpp: In function ‘Atomize’: 108:40.08 /home/marxin/Programming/gecko-dev/js/src/vm/JSAtom.cpp:965: error: verify_flow_info: Incorrect fallthru 423->424 108:40.08 965 | } 108:40.08 | 108:40.08 /home/marxin/Programming/gecko-dev/js/src/vm/JSAtom.cpp:965: error: wrong insn in the fallthru edge 108:40.08 (barrier 6592 9309 2658) 108:40.08 during RTL pass: bbro 108:40.08 /home/marxin/Programming/gecko-dev/js/src/vm/JSAtom.cpp:965: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2930 108:40.08 0x6417c0 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) 108:40.08 /home/marxin/Programming/gcc/gcc/rtl-error.c:108 108:40.08 0x80dba1 rtl_verify_fallthru 108:40.08 /home/marxin/Programming/gcc/gcc/cfgrtl.c:2930 108:40.08 0x80dba1 rtl_verify_flow_info 108:40.08 /home/marxin/Programming/gcc/gcc/cfgrtl.c:3031 108:40.08 0x7f1e0d verify_flow_info() 108:40.08 /home/marxin/Programming/gcc/gcc/cfghooks.c:263 108:40.08 0x80b8b9 checking_verify_flow_info 108:40.08 /home/marxin/Programming/gcc/gcc/cfghooks.h:198 108:40.08 0x80b8b9 cfg_layout_finalize() 108:40.08 /home/marxin/Programming/gcc/gcc/cfgrtl.c:4359 108:40.08 0x13a18f9 execute 108:40.08 /home/marxin/Programming/gcc/gcc/bb-reorder.c:2658 would be non-trivial to reduce/debug.
Lemme try to fix it.
Author: marxin Date: Wed Feb 13 06:57:38 2019 New Revision: 268835 URL: https://gcc.gnu.org/viewcvs?rev=268835&root=gcc&view=rev Log: Remove a barrier when EDGE_CROSSING is removed (PR lto/88858). 2019-02-13 Martin Liska <mliska@suse.cz> PR lto/88858 * cfgrtl.c (remove_barriers_from_footer): New function. (try_redirect_by_replacing_jump): Use it. (cfg_layout_redirect_edge_and_branch): Likewise. Modified: trunk/gcc/ChangeLog trunk/gcc/cfgrtl.c
Fixed on trunk so far.
Author: marxin Date: Thu Feb 14 11:25:18 2019 New Revision: 268872 URL: https://gcc.gnu.org/viewcvs?rev=268872&root=gcc&view=rev Log: Backport r268835 2019-02-14 Martin Liska <mliska@suse.cz> Backport from mainline 2019-02-13 Martin Liska <mliska@suse.cz> PR lto/88858 * cfgrtl.c (remove_barriers_from_footer): New function. (try_redirect_by_replacing_jump): Use it. (cfg_layout_redirect_edge_and_branch): Likewise. Modified: branches/gcc-8-branch/gcc/ChangeLog branches/gcc-8-branch/gcc/cfgrtl.c
GCC 7 branch is not affected, closing then.