https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103074
Bug ID: 103074
Summary: [11/12 Regression] ICE in lra_assign, at
lra-assigns.c:1649
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: x86_64-unknown-linux-gnu
gcc-12.0.0-alpha20211031 snapshot (g:ca84f39399fda80c770306465276ffd66d3766ed)
ICEs when compiling the following testcase, which could expose UB in run time,
w/ -march=bonnell -Os -fPIC -fschedule-insns:
void
serialize_collection (char *ptr, int a, int need_owner)
{
if (need_owner)
__builtin_sprintf(ptr, "%d:%d", 0, a);
else
{
static char buff[32];
__builtin_sprintf(buff, "%d:%d", a >> 32, a);
__builtin_sprintf(ptr, "%d:%d:\"%s\"", 0, 0, buff);
}
}
% x86_64-unknown-linux-gnu-gcc-12.0.0 -march=bonnell -Os -fPIC -fschedule-insns
-c jmolltrp.c
jmolltrp.c: In function 'serialize_collection':
jmolltrp.c:10:42: warning: right shift count >= width of type
[-Wshift-count-overflow]
10 | __builtin_sprintf(buff, "%d:%d", a >> 32, a);
| ^~
during RTL pass: reload
jmolltrp.c:13:1: internal compiler error: in lra_assign, at lra-assigns.c:1649
13 | }
| ^
0xce9af3 lra_assign(bool&)
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211031/work/gcc-12-20211031/gcc/lra-assigns.c:1649
0xce3da4 lra(_IO_FILE*)
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211031/work/gcc-12-20211031/gcc/lra.c:2387
0xc9c029 do_reload
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211031/work/gcc-12-20211031/gcc/ira.c:5932
0xc9c029 execute
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211031/work/gcc-12-20211031/gcc/ira.c:6118
