https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94731
Bug ID: 94731
Summary: [10 Regression] internal compiler error: in
fold_convert_loc, at fold-const.c:2558
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: anbu1024.me at gmail dot com
Target Milestone: ---
$ cat reduced.c
int x = - 1 << 0 ;
int foo ()
{
switch ( x )
case - 1 << 0 :
break ;
}
int x[] = { 1 };
--------------------------------------------------------------------------------
$ gcc-10 --version
gcc (GCC) 10.0.1 20200419 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
--------------------------------------------------------------------------------
$ gcc-10 reduced.c
reduced.c:11:5: error: conflicting types for ‘x’
11 | int x[] = { 1 };
| ^
reduced.c:2:5: note: previous definition of ‘x’ was here
2 | int x = - 1 << 0 ;
| ^
during GIMPLE pass: cfg
reduced.c: In function ‘foo’:
reduced.c:4:5: internal compiler error: in fold_convert_loc, at
fold-const.c:2558
4 | int foo ()
| ^~~
0x65b384 fold_convert_loc(unsigned int, tree_node*, tree_node*)
../../gcc-10-20200419/gcc/fold-const.c:2558
0xdf7852 convert_single_case_switch
../../gcc-10-20200419/gcc/tree-cfgcleanup.c:110
0xdf7852 cleanup_control_expr_graph
../../gcc-10-20200419/gcc/tree-cfgcleanup.c:145
0xdf7852 cleanup_control_flow_bb
../../gcc-10-20200419/gcc/tree-cfgcleanup.c:252
0xdf7a95 cleanup_control_flow_pre
../../gcc-10-20200419/gcc/tree-cfgcleanup.c:886
0xdf8c4b cleanup_tree_cfg_noloop
../../gcc-10-20200419/gcc/tree-cfgcleanup.c:1055
0xdf9428 cleanup_tree_cfg(unsigned int)
../../gcc-10-20200419/gcc/tree-cfgcleanup.c:1165
0xdf03a4 execute_build_cfg
../../gcc-10-20200419/gcc/tree-cfg.c:376
0xdf03a4 execute
../../gcc-10-20200419/gcc/tree-cfg.c:405
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
--------------------------------------------------------------------------------
$ gcc-9 --version
gcc (GCC) 9.2.1 20191102
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
--------------------------------------------------------------------------------
$ gcc-9 reduced.c
reduced.c:11:5: error: conflicting types for ‘x’
11 | int x[] = { 1 };
| ^
reduced.c:2:5: note: previous definition of ‘x’ was here
2 | int x = - 1 << 0 ;
| ^
reduced.c:4: confused by earlier errors, bailing out
