https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98235
Bug ID: 98235
Summary: ice in decompose with -O3 -fallow-store-data-races
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
For this C source code:
char tcube[3][9];
int cur_move;
void perm_cube(void) {
int i, j, k, tmp;
for (; i < cur_move; i++)
while (k-- >= 0)
switch (j) {
case 0:
tmp = tcube[0][6];
tcube[2][8] = tcube[0][8];
tcube[0][8] = tmp;
tmp = tcube[0][5];
tcube[0][5] = tcube[1][8];
tcube[1][8] = tcube[2][5];
tcube[2][5] = tcube[1][2];
tcube[1][2] = tcube[2][1];
tcube[2][1] = tcube[1][0];
tcube[0][6] = tmp;
tmp = tcube[0][3];
tcube[0][3] = tcube[1][0];
tcube[1][0] = tcube[2][3];
tcube[2][3] = tcube[1][6];
tcube[1][6] = tmp;
break;
case 5:
tmp = tcube[2][0];
tcube[2][0] = tcube[2][2];
tcube[2][2] = tcube[2][8];
tcube[2][3] = tmp;
}
}
compiled as follows:
$ /home/dcb/gcc/results/bin/gcc -c -w -O3 -fallow-store-data-races -w bug676.c
does this:
gcc: internal compiler error: Segmentation fault signal terminated program cc1
Please submit a full bug report
gdb on cc1 says
Program received signal SIGSEGV, Segmentation fault.
0x000000000109b2a2 in wide_int_ref_storage<true,
true>::wide_int_ref_storage<int> (this=<optimized out>, x=<optimized out>,
precision=<optimized out>)
at ../../trunk.git/gcc/wide-int.h:1034
1034 : storage_ref (wi::int_traits <T>::decompose (scratch, precision, x))
(gdb)
The bug appeared sometime before 20201111.
