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[Bug debug/71549] New: ICE on valid code at -O2 and -O3 with -g enabled in 64-bit mode on x86_64-linux-gnu: in simplify_subreg, at simplify-rtx.c:5952
- From: "su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 15 Jun 2016 22:25:59 +0000
- Subject: [Bug debug/71549] New: ICE on valid code at -O2 and -O3 with -g enabled in 64-bit mode on x86_64-linux-gnu: in simplify_subreg, at simplify-rtx.c:5952
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71549
Bug ID: 71549
Summary: ICE on valid code at -O2 and -O3 with -g enabled in
64-bit mode on x86_64-linux-gnu: in simplify_subreg,
at simplify-rtx.c:5952
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
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 the 64-bit mode (but not in
the 32-bit mode).
It is a regression from 6.1.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160615 (experimental) [trunk revision 237485] (GCC)
$
$ gcc-trunk -m64 -Os -g small.c
$ gcc-6.1 -m64 -O2 -g small.c
$
$ gcc-trunk -m64 -O2 -g small.c
small.c: In function âmainâ:
small.c:21:1: internal compiler error: in simplify_subreg, at
simplify-rtx.c:5952
}
^
0xba9fab simplify_subreg(machine_mode, rtx_def*, machine_mode, unsigned int)
../../gcc-source-trunk/gcc/simplify-rtx.c:5951
0xbaa5c9 simplify_gen_subreg(machine_mode, rtx_def*, machine_mode, unsigned
int)
../../gcc-source-trunk/gcc/simplify-rtx.c:6171
0xeab2db vt_expand_loc_callback
../../gcc-source-trunk/gcc/var-tracking.c:8435
0x7e9b59 cselib_expand_value_rtx_1
../../gcc-source-trunk/gcc/cselib.c:1648
0x7eb53e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
../../gcc-source-trunk/gcc/cselib.c:1530
0xeab763 vt_expand_var_loc_chain
../../gcc-source-trunk/gcc/var-tracking.c:8330
0xeab763 vt_expand_loc_callback
../../gcc-source-trunk/gcc/var-tracking.c:8492
0x7e9a75 cselib_expand_value_rtx_1
../../gcc-source-trunk/gcc/cselib.c:1683
0x7eb53e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
../../gcc-source-trunk/gcc/cselib.c:1530
0xeab763 vt_expand_var_loc_chain
../../gcc-source-trunk/gcc/var-tracking.c:8330
0xeab763 vt_expand_loc_callback
../../gcc-source-trunk/gcc/var-tracking.c:8492
0x7eb53e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
../../gcc-source-trunk/gcc/cselib.c:1530
0xeab763 vt_expand_var_loc_chain
../../gcc-source-trunk/gcc/var-tracking.c:8330
0xeab763 vt_expand_loc_callback
../../gcc-source-trunk/gcc/var-tracking.c:8492
0x7e9a75 cselib_expand_value_rtx_1
../../gcc-source-trunk/gcc/cselib.c:1683
0x7eb53e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
../../gcc-source-trunk/gcc/cselib.c:1530
0xeaa359 vt_expand_var_loc_chain
../../gcc-source-trunk/gcc/var-tracking.c:8330
0xeaa359 vt_expand_1pvar
../../gcc-source-trunk/gcc/var-tracking.c:8605
0xeaa359 emit_note_insn_var_location(variable**, emit_note_data*)
../../gcc-source-trunk/gcc/var-tracking.c:8660
0xead3da traverse_noresize<emit_note_data*, emit_note_insn_var_location>
../../gcc-source-trunk/gcc/hash-table.h:950
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.
$
--------------------------
struct S1
{
int f0;
int f1;
int f2;
int:4;
} a, b;
void
fn1 (struct S1 p1)
{
a = p1;
int c = p1.f0;
}
int
main ()
{
fn1 (b);
return 0;
}