https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84740
Bug ID: 84740
Summary: [8 Regression] ICE in build_constructors, at
tree-switch-conversion.c:965
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gs...@t-online.de
Target Milestone: ---
Gives an ICE at -O[s23] since at least 20170618.
Shrinked/modified from gcc.dg/tree-ssa/cswtch-4.c
$ cat z1.c
void
frobulate_for_gcc (unsigned int v)
{
const char *s;
switch (v)
{
case 0:
s = "foo";
break;
case 1:
s = "bar";
break;
case 2:
s = "spam";
break;
default:
s = (const char *) 0;
break;
}
if (!s)
__builtin_printf ("%s\n", s);
}
$ gcc-7 -c z1.c -O2
$ gcc-8-20180304 -c z1.c -O1
$ gcc-8-20180304 -c z1.c -O2
during GIMPLE pass: switchconv
z1.c: In function 'frobulate_for_gcc':
z1.c:22:1: internal compiler error: in build_constructors, at
tree-switch-conversion.c:965
}
^
0xbb98a0 build_constructors
../../gcc/tree-switch-conversion.c:965
0xbb98a0 process_switch
../../gcc/tree-switch-conversion.c:1566
0xbb98a0 execute
../../gcc/tree-switch-conversion.c:1630
No ICE without line "if (!s)".
