http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47738
--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> 2011-02-14 20:44:43 UTC --- Backtrace for the 4.5 crash: $ gcc-4.5 -O3 -fno-tree-vectorize testcase.c ==13333== Invalid read of size 2 ==13333== at 0x6CE7AC: is_gimple_val (gimple.c:2718) ==13333== by 0x86D3D4: verify_gimple_phi (tree-cfg.c:3714) ==13333== by 0x875BD7: verify_stmts (tree-cfg.c:4112) ==13333== by 0x977D2E: verify_ssa (tree-ssa.c:874) ==13333== by 0x92DB4C: verify_loop_closed_ssa (tree-ssa-loop-manip.c:457) ==13333== by 0x92E22C: gimple_duplicate_loop_to_header_edge (tree-ssa-loop-manip.c:619) ==13333== by 0x92EC99: tree_transform_and_unroll_loop (tree-ssa-loop-manip.c:1043) ==13333== by 0x8C6E5C: tree_predictive_commoning_loop (tree-predcom.c:2547) ==13333== by 0x8C8202: tree_predictive_commoning (tree-predcom.c:2584) ==13333== by 0x937706: run_tree_predictive_commoning (tree-ssa-loop.c:186) ==13333== by 0x777CEA: execute_one_pass (passes.c:1568) ==13333== by 0x777F74: execute_pass_list (passes.c:1623) ==13333== by 0x777F86: execute_pass_list (passes.c:1624) ==13333== by 0x777F86: execute_pass_list (passes.c:1624) ==13333== by 0x8B8774: tree_rest_of_compilation (tree-optimize.c:413) ==13333== by 0xA52F00: cgraph_expand_function (cgraphunit.c:1574) ==13333== by 0xA55874: cgraph_optimize (cgraphunit.c:1653) ==13333== by 0xA55FD4: cgraph_finalize_compilation_unit (cgraphunit.c:1122) ==13333== by 0x4B1272: c_write_global_declarations (c-decl.c:9520) ==13333== by 0x867A14: toplev_main (toplev.c:1065) ==13333== by 0x6738BBC: (below main) (in /lib64/libc-2.11.2.so) ==13333== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==13333== testcase.c: In function 'foo': testcase.c:5:1: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions.
