http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46777
Summary: [4.5/4.6 Regression] ICE: in rtl_verify_flow_info, at cfgrtl.c:2164 with -O -fgcse -fno-tree-dominator-opts -funroll-loops Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization AssignedTo: unassig...@gcc.gnu.org ReportedBy: zso...@seznam.cz Host: x86_64-pc-linux-gnu Target: x86_64-pc-linux-gnu Created attachment 22610 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22610 reduced testcase The ICE message looks similiar to PR46440 and PR46493, but this one fails in trunk as well. $ gcc -fgcse -O -fno-tree-dominator-opts -funroll-loops pr46777.c pr46777.c: In function 'little2_prologTok': pr46777.c:39:1: error: verify_flow_info: Incorrect fallthru 67->68 pr46777.c:39:1: error: wrong insn in the fallthru edge (barrier 585 579 594) pr46777.c:39:1: internal compiler error: in rtl_verify_flow_info, at cfgrtl.c:2164 Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. Backtrace: (gdb) bt #0 error (gmsgid=0x10ef838 "verify_flow_info: Incorrect fallthru %i->%i") at /mnt/svn/gcc-trunk/gcc/diagnostic.c:747 #1 0x00000000005f6997 in rtl_verify_flow_info () at /mnt/svn/gcc-trunk/gcc/cfgrtl.c:2162 #2 0x00000000005e6cd4 in verify_flow_info () at /mnt/svn/gcc-trunk/gcc/cfghooks.c:257 #3 0x00000000005ebffa in outof_cfg_layout_mode () at /mnt/svn/gcc-trunk/gcc/cfglayout.c:362 #4 0x00000000007eb69f in execute_one_pass (pass=0x1630b00) at /mnt/svn/gcc-trunk/gcc/passes.c:1553 #5 0x00000000007eb965 in execute_pass_list (pass=0x1630b00) at /mnt/svn/gcc-trunk/gcc/passes.c:1608 #6 0x00000000007eb977 in execute_pass_list (pass=0x1632200) at /mnt/svn/gcc-trunk/gcc/passes.c:1609 #7 0x000000000092bb86 in tree_rest_of_compilation (fndecl=0x7ffff5ce3000) at /mnt/svn/gcc-trunk/gcc/tree-optimize.c:422 #8 0x0000000000af13c2 in cgraph_expand_function (node=0x7ffff5ce2160) at /mnt/svn/gcc-trunk/gcc/cgraphunit.c:1508 #9 0x0000000000af399a in cgraph_expand_all_functions () at /mnt/svn/gcc-trunk/gcc/cgraphunit.c:1567 #10 cgraph_optimize () at /mnt/svn/gcc-trunk/gcc/cgraphunit.c:1827 #11 0x0000000000af3f1a in cgraph_finalize_compilation_unit () at /mnt/svn/gcc-trunk/gcc/cgraphunit.c:1031 #12 0x0000000000508b8c in c_write_global_declarations () at /mnt/svn/gcc-trunk/gcc/c-decl.c:9844 #13 0x00000000008d5580 in compile_file (argc=16, argv=0x7fffffffdc38) at /mnt/svn/gcc-trunk/gcc/toplev.c:591 #14 do_compile (argc=16, argv=0x7fffffffdc38) at /mnt/svn/gcc-trunk/gcc/toplev.c:1874 #15 toplev_main (argc=16, argv=0x7fffffffdc38) at /mnt/svn/gcc-trunk/gcc/toplev.c:1937 #16 0x00007ffff6586bbd in __libc_start_main () from /lib/libc.so.6 #17 0x00000000004ef5f1 in _start () Tested revisions: r167383 - crash 4.5 r166509 - crash 4.4 r166509 - OK