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[Bug tree-optimization/66349] New: ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu in dfs_enumerate_from, at cfganal.c:1195
- From: "su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sun, 31 May 2015 05:33:09 +0000
- Subject: [Bug tree-optimization/66349] New: ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu in dfs_enumerate_from, at cfganal.c:1195
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66349
Bug ID: 66349
Summary: ICE on valid code at -O1, -O2 and -O3 on
x86_64-linux-gnu in dfs_enumerate_from, at
cfganal.c:1195
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The following code causes an ICE when compiled with the current gcc trunk at
-O1, -O2 and -O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It is a regression from 5.1.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20150530 (experimental) [trunk revision 223885] (GCC)
$
$ gcc-trunk -O0 -c small.c
$ gcc-trunk -Os -c small.c
$ gcc-5.1 -O1 -c small.c
$
$ gcc-trunk -O1 -c small.c
small.c: In function âfn1â:
small.c:5:1: internal compiler error: in dfs_enumerate_from, at cfganal.c:1195
fn1 ()
^
0x6d8a09 dfs_enumerate_from(basic_block_def*, int, bool (*)(basic_block_def
const*, void const*), basic_block_def**, int, void const*)
../../gcc-trunk/gcc/cfganal.c:1195
0xcd02e5 determine_bb_domination_status
../../gcc-trunk/gcc/tree-ssa-threadupdate.c:1768
0xcd02e5 thread_through_loop_header
../../gcc-trunk/gcc/tree-ssa-threadupdate.c:1953
0xcd253a thread_through_all_blocks(bool)
../../gcc-trunk/gcc/tree-ssa-threadupdate.c:2667
0xc1354b execute
../../gcc-trunk/gcc/tree-ssa-dom.c:1244
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$
-------------------------------------
unsigned int a;
int b, c, d, e, f;
void
fn1 ()
{
for (; b; b++)
{
for (e = 0; e < 1; e++)
;
int i = -1, j = 1;
if (f)
{
for (; a < 1; a++)
;
i++;
j = 0;
}
for (; d; d++)
{
if (j)
for (;; c++)
;
if (i)
continue;
return;
}
}
}