https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84592
Bug ID: 84592
Summary: [openacc] lto1: ICE in input_varpool_node, at
lto-cgraph.c:1424: for CSWTCH symbol
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Consider the following openacc testcase:
...
/* { dg-additional-options "-ftree-switch-conversion" } */
#include <stdio.h>
#pragma acc routine seq
static int __attribute__((noinline)) foo (int n)
{
switch (n & 3)
{
case 0: return 4;
case 1: return 3;
case 2: return 2;
default:
return 1;
}
}
int
main (void)
{
int n[1];
n[1] = 4;
#pragma acc parallel copy(n)
{
n[0] = foo (n[0]);
}
printf ("n: %d\n", n[0]);
return 0;
}
...
When compiling this (by copying it into
libgomp/testsuite/libgomp.oacc-c-c++-common), we run into:
...
lto1: internal compiler error: in input_varpool_node, at lto-cgraph.c:1424^M
0x959ebb input_varpool_node^M
gcc/lto-cgraph.c:1422^M
0x959ebb input_cgraph_1^M
gcc/lto-cgraph.c:1544^M
0x959ebb input_symtab()^M
gcc/lto-cgraph.c:1858^M
0x5aceac read_cgraph_and_symbols^M
gcc/lto/lto.c:2891^M
0x5aceac lto_main()^M
gcc/lto/lto.c:3356^M
...
When running lto1 using gdb we find the node we're processing is:
...
(gdb) call debug_generic_expr ( node.decl )
CSWTCH.4
...
The CSWTCH.4 is a symbol introduced by -ftree-switch-conversion. If we use
-fno-tree-switch-conversion there's no ICE.
