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[Bug rtl-optimization/71295] New: [7 Regression] internal compiler error: in subreg_get_info, at rtlanal.c:3673 on arm
- From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 26 May 2016 15:34:20 +0000
- Subject: [Bug rtl-optimization/71295] New: [7 Regression] internal compiler error: in subreg_get_info, at rtlanal.c:3673 on arm
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71295
Bug ID: 71295
Summary: [7 Regression] internal compiler error: in
subreg_get_info, at rtlanal.c:3673 on arm
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
Target Milestone: ---
Target: arm
extern void fn2 (long long);
int a;
void
fn1 ()
{
long long b[3];
a = 0;
for (; a < 3; a++)
b[a] = 1;
fn2 (b[1]);
}
ICEs for me on arm with -O3 -march=armv8-a -mfpu=neon-fp-armv8 -mfloat-abi=hard
mycrash.c: In function 'fn1':
mycrash.c:12:1: internal compiler error: in subreg_get_info, at rtlanal.c:3673
}
^
0xa7b284 subreg_get_info(unsigned int, machine_mode, unsigned int,
machine_mode, subreg_info*)
$SRC/gcc/rtlanal.c:3673
0xa7b52c simplify_subreg_regno(unsigned int, machine_mode, unsigned int,
machine_mode)
$SRC/gcc/rtlanal.c:3808
0xa500cc simplifiable_subregs(subreg_shape const&)
$SRC/gcc/reginfo.c:1234
0xa501b8 record_subregs_of_mode
$SRC/gcc/reginfo.c:1295
0xa50434 init_subregs_of_mode()
$SRC/gcc/reginfo.c:1349
0x947656 init_costs
$SRC/gcc/ira-costs.c:2187
0x94c0a8 ira_set_pseudo_classes(bool, _IO_FILE*)
$SRC/gcc/ira-costs.c:2237
0x1121695 alloc_global_sched_pressure_data
$SRC/gcc/haifa-sched.c:7244
0x1121695 sched_init()
$SRC/gcc/haifa-sched.c:7394
0x1122a13 haifa_sched_init()
$SRC/gcc/haifa-sched.c:7406
0xa878f1 schedule_insns()
$SRC/gcc/sched-rgn.c:3504
0xa880a1 rest_of_handle_sched
$SRC/gcc/sched-rgn.c:3717
0xa880a1 execute
$SRC/gcc/sched-rgn.c:3825
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Please include the complete backtrace with any bug report.
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Bisection shows it started with r236582 but that's a SLP vectorisation patch so
I suspect it's exposing a latent issue