[Bug bootstrap/71071] New: [7 regression] ICE --enable-checking=fold : fold check: original tree changed by fold

[dimhen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71071

            Bug ID: 71071
           Summary: [7 regression] ICE --enable-checking=fold : fold
                    check: original tree changed by fold
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dimhen at gmail dot com
  Target Milestone: ---

r236043 PASS
r236132 FAIL

/home/dimhen/src/gcc_current/configure --prefix=/usr/local/gcc_current
--enable-checking=fold --enable-languages=c,c++ --disable-multilib

/home/dimhen/build/gcc_current/./gcc/xgcc
-B/home/dimhen/build/gcc_current/./gcc/
-B/usr/local/gcc_current/x86_64-pc-linux-gnu/bin/
-B/usr/local/gcc_current/x86_64-pc-linux-gnu/lib/ -isystem
/usr/local/gcc_current/x86_64-pc-linux-gnu/include -isystem
/usr/local/gcc_current/x86_64-pc-linux-gnu/sys-include    -g -O2 -O2  -g -O2
-DIN_GCC    -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-format
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector   -fpic -mlong-double-80
-DUSE_ELF_SYMVER -I. -I. -I../.././gcc -I/home/dimhen/src/gcc_current/libgcc
-I/home/dimhen/src/gcc_current/libgcc/.
-I/home/dimhen/src/gcc_current/libgcc/../gcc
-I/home/dimhen/src/gcc_current/libgcc/../include
-I/home/dimhen/src/gcc_current/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS  -DUSE_TLS -o _gcov.o -MT _gcov.o -MD -MP -MF _gcov.dep -DL_gcov
-c /home/dimhen/src/gcc_current/libgcc/libgcov-driver.c
/home/dimhen/src/gcc_current/libgcc/libgcov-driver.c: In function
'__gcov_dump_one':
/home/dimhen/src/gcc_current/libgcc/libgcov-driver.c:855:3: internal compiler
error: fold check: original tree changed by fold
   if (root->dumped)
   ^~
0xa3931f fold_check_failed
        /home/dimhen/src/gcc_current/gcc/fold-const.c:12099
0xa3a05c fold_build2_stat_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        /home/dimhen/src/gcc_current/gcc/fold-const.c:12358
0x11e7407 generic_simplify_186
        /home/dimhen/build/gcc_current/gcc/generic-match.c:6903
0x1224527 generic_simplify_NE_EXPR
        /home/dimhen/build/gcc_current/gcc/generic-match.c:27430
0x1229e7a generic_simplify(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        /home/dimhen/build/gcc_current/gcc/generic-match.c:29656
0xa2e7af fold_binary_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        /home/dimhen/src/gcc_current/gcc/fold-const.c:9265
0xa39f9c fold_build2_stat_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        /home/dimhen/src/gcc_current/gcc/fold-const.c:12347
0x80aa18 c_fully_fold_internal
        /home/dimhen/src/gcc_current/gcc/c/c-fold.c:305
0x80a147 c_fully_fold(tree_node*, bool, bool*)
        /home/dimhen/src/gcc_current/gcc/c/c-fold.c:90
0x7de299 c_parser_condition
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:5314
0x7de2f7 c_parser_paren_condition
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:5331
0x7de775 c_parser_if_statement
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:5493
0x7ddac5 c_parser_statement_after_labels
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:5138
0x7dd543 c_parser_compound_statement_nostart
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:4858
0x7dcf5a c_parser_compound_statement
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:4693
0x7d7fb7 c_parser_declaration_or_fndef
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:2105
0x7d6b98 c_parser_external_declaration
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:1549
0x7d6740 c_parser_translation_unit
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:1430
0x801c9e c_parse_file()
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:17915
0x8602ec c_common_parse_file()
        /home/dimhen/src/gcc_current/gcc/c-family/c-opts.c:1064
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