https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65321
Bug ID: 65321 Summary: ICE on valid code at -O2 and -O3 with -g enabled in decompose, at rtl.h:2007 Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: su at cs dot ucdavis.edu The following code causes an ICE when compiled with the current gcc trunk at -O2 and -O3 with -g enabled on x86_64-linux-gnu in both 32-bit and 64-bit modes. This is a regression from 4.9.x. $ gcc-trunk -v Using built-in specs. COLLECT_GCC=gcc-trunk COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk --enable-languages=c,c++ --disable-werror --enable-multilib Thread model: posix gcc version 5.0.0 20150304 (experimental) [trunk revision 221192] (GCC) $ $ gcc-trunk -O2 -c small.c $ gcc-4.9.2 -O2 -g -c small.c $ $ gcc-trunk -O2 -g -c small.c small.c: In function ‘fn1’: small.c:27:1: internal compiler error: in decompose, at rtl.h:2007 } ^ 0xae1a87 wi::int_traits<std::pair<rtx_def*, machine_mode> >::decompose(long*, unsigned int, std::pair<rtx_def*, machine_mode> const&) ../../gcc-trunk/gcc/rtl.h:2005 0xae1a87 wide_int_ref_storage<false>::wide_int_ref_storage<std::pair<rtx_def*, machine_mode> >(std::pair<rtx_def*, machine_mode> const&, unsigned int) ../../gcc-trunk/gcc/wide-int.h:957 0xae1a87 generic_wide_int<wide_int_ref_storage<false> >::generic_wide_int<std::pair<rtx_def*, machine_mode> >(std::pair<rtx_def*, machine_mode> const&, unsigned int) ../../gcc-trunk/gcc/wide-int.h:733 0xae1a87 wi::binary_traits<std::pair<rtx_def*, machine_mode>, std::pair<rtx_def*, machine_mode>, wi::int_traits<std::pair<rtx_def*, machine_mode> >::precision_type, wi::int_traits<std::pair<rtx_def*, machine_mode> >::precision_type>::result_type wi::sub<std::pair<rtx_def*, machine_mode>, std::pair<rtx_def*, machine_mode> >(std::pair<rtx_def*, machine_mode> const&, std::pair<rtx_def*, machine_mode> const&) ../../gcc-trunk/gcc/wide-int.h:2357 0xae1a87 simplify_const_binary_operation(rtx_code, machine_mode, rtx_def*, rtx_def*) ../../gcc-trunk/gcc/simplify-rtx.c:3934 0xaded4f simplify_binary_operation(rtx_code, machine_mode, rtx_def*, rtx_def*) ../../gcc-trunk/gcc/simplify-rtx.c:1987 0x7791f3 cselib_expand_value_rtx_1 ../../gcc-trunk/gcc/cselib.c:1843 0x77a38e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def* (*)(rtx_def*, bitmap_head*, int, void*), void*) ../../gcc-trunk/gcc/cselib.c:1551 0xd88005 vt_expand_var_loc_chain ../../gcc-trunk/gcc/var-tracking.c:8310 0xd88005 vt_expand_loc_callback ../../gcc-trunk/gcc/var-tracking.c:8472 0x779102 cselib_expand_value_rtx_1 ../../gcc-trunk/gcc/cselib.c:1704 0x77a38e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def* (*)(rtx_def*, bitmap_head*, int, void*), void*) ../../gcc-trunk/gcc/cselib.c:1551 0xd88bb1 vt_expand_var_loc_chain ../../gcc-trunk/gcc/var-tracking.c:8310 0xd88bb1 vt_expand_1pvar ../../gcc-trunk/gcc/var-tracking.c:8585 0xd88bb1 emit_note_insn_var_location(variable_def**, emit_note_data_def*) ../../gcc-trunk/gcc/var-tracking.c:8640 0xd92403 void hash_table<variable_hasher, xcallocator, false>::traverse_noresize<emit_note_data_def*, &(emit_note_insn_var_location(variable_def**, emit_note_data_def*))>(emit_note_data_def*) ../../gcc-trunk/gcc/hash-table.h:1057 0xd92403 void hash_table<variable_hasher, xcallocator, false>::traverse<emit_note_data_def*, &(emit_note_insn_var_location(variable_def**, emit_note_data_def*))>(emit_note_data_def*) ../../gcc-trunk/gcc/hash-table.h:1079 0xd92403 emit_notes_for_changes ../../gcc-trunk/gcc/var-tracking.c:9000 0xd94140 emit_notes_in_bb ../../gcc-trunk/gcc/var-tracking.c:9432 0xd94140 vt_emit_notes ../../gcc-trunk/gcc/var-tracking.c:9495 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. $ ------------------------------------- int a, b, c, d, e; int fn1 () { int h; char i; for (; c > 0;) { for (d = 0; d < 2; d++) { i = 1 << d; if (i - a) { e = b = 0; for (; c; c--) d = 127; } } h = ~d; if (h > c) for (;;) ; return 0; } return 0; }