[Bug middle-end/114912] New: [15 regression] SIGBUS in wi::copy<> on SPARC

["ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114912

            Bug ID: 114912
           Summary: [15 regression] SIGBUS in wi::copy<> on SPARC
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
                CC: aldyh at gcc dot gnu.org
  Target Milestone: ---
            Target: sparc-sun-solaris2.11

Between 20240430 (0b2735e0797fee9b4ec5cd74f22afe0483f888dd) and 20240501
(c3bc2787b8beb7aae67fdf2a7f7271a9a4edca7c),
Solaris/SPARC bootstrap began to fail with a SIGBUS in cc1 compiling stage 1
libgcc.

E.g.

/var/gcc/reghunt/sigbus-range/288807/./gcc/xgcc
-B/var/gcc/reghunt/sigbus-range/288807/./gcc/
-B/usr/local/sparc-sun-solaris2.11/bin/ -B/usr/local/sparc-sun-solaris2.11/lib/
-isystem /usr/local/sparc-sun-solaris2.11/include -isystem
/usr/local/sparc-sun-solaris2.11/sys-include    -g -O2 -O2  -g -O2 -DIN_GCC  
-W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition  -isystem ./include  -fPIC -g
-DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector  -fPIC -I. -I.
-I../.././gcc -I/var/gcc/reghunt/master/libgcc
-I/var/gcc/reghunt/master/libgcc/. -I/var/gcc/reghunt/master/libgcc/../gcc
-I/var/gcc/reghunt/master/libgcc/../include     -o _muldi3.o -MT _muldi3.o -MD
-MP -MF _muldi3.dep -DL_muldi3 -c /var/gcc/reghunt/master/libgcc/libgcc2.c
-fvisibility=hidden -DHIDE_EXPORTS
during GIMPLE pass: evrp
/var/gcc/reghunt/master/libgcc/libgcc2.c: In function ‘__muldi3’:
/var/gcc/reghunt/master/libgcc/libgcc2.c:538:1: internal compiler error: Bus
Error
  538 | }
      | ^
0xf26783 crash_signal
        /var/gcc/reghunt/master/gcc/toplev.cc:319
0x723e58 void wi::copy<wide_int_storage,
generic_wide_int<wide_int_ref_storage<true, false> > >(wide_int_storage&,
generic_wide_int<wide_int_ref_storage<true, false> > const&)
        /var/gcc/reghunt/master/gcc/wide-int.h:2191
0x723e58 wide_int_storage&
wide_int_storage::operator=<wi::hwi_with_prec>(wi::hwi_with_prec const&)
        /var/gcc/reghunt/master/gcc/wide-int.h:1247
0x723e58 generic_wide_int<wide_int_storage>&
generic_wide_int<wide_int_storage>::operator=<wi::hwi_with_prec>(wi::hwi_with_prec
const&)
        /var/gcc/reghunt/master/gcc/wide-int.h:1002
0x723e58 irange_bitmask::set_unknown(unsigned int)
        /var/gcc/reghunt/master/gcc/value-range.h:163
0x723e58 irange::set_varying(tree_node*)
        /var/gcc/reghunt/master/gcc/value-range.h:1067
0x13680db gimple_range_global(vrange&, tree_node*, function*)
        /var/gcc/reghunt/master/gcc/value-query.cc:419
0x136954f global_range_query::range_of_expr(vrange&, tree_node*, gimple*)
        /var/gcc/reghunt/master/gcc/value-query.cc:436
0x1ad000b fur_stmt::get_operand(vrange&, tree_node*)
        /var/gcc/reghunt/master/gcc/gimple-range-fold.cc:162
0x1ad5edb fold_using_range::range_of_range_op(vrange&,
gimple_range_op_handler&, fur_source&)
        /var/gcc/reghunt/master/gcc/gimple-range-fold.cc:673
0x1ad831f fold_using_range::fold_stmt(vrange&, gimple*, fur_source&,
tree_node*)
        /var/gcc/reghunt/master/gcc/gimple-range-fold.cc:604
0x1ad8927 fold_range(vrange&, gimple*, range_query*)
        /var/gcc/reghunt/master/gcc/gimple-range-fold.cc:324
0x1ac8727 ranger_cache::get_global_range(vrange&, tree_node*, bool&)
        /var/gcc/reghunt/master/gcc/gimple-range-cache.cc:1054
0x1abefaf gimple_ranger::range_of_stmt(vrange&, gimple*, tree_node*)
        /var/gcc/reghunt/master/gcc/gimple-range.cc:323
0x1367d2f range_query::value_of_stmt(gimple*, tree_node*)
        /var/gcc/reghunt/master/gcc/value-query.cc:133
0x1315c3f rvrp_folder::value_of_stmt(gimple*, tree_node*)
        /var/gcc/reghunt/master/gcc/tree-vrp.cc:1001
0x11ab12f substitute_and_fold_dom_walker::before_dom_children(basic_block_def*)
        /var/gcc/reghunt/master/gcc/tree-ssa-propagate.cc:820
0x1a4df83 dom_walker::walk(basic_block_def*)
        /var/gcc/reghunt/master/gcc/domwalk.cc:311
0x11a9d07 substitute_and_fold_engine::substitute_and_fold(basic_block_def*)
        /var/gcc/reghunt/master/gcc/tree-ssa-propagate.cc:999
0x13132f7 execute_ranger_vrp(function*, bool, bool)
        /var/gcc/reghunt/master/gcc/tree-vrp.cc:1066

A reghunt identified

commit c60b3e211c555706cdc2dc8bfcdd540152cff350
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Tue Apr 30 19:39:00 2024 +0200

    Reduce startup costs for Value_Range.

as the culprit.