https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69771
Bug ID: 69771
Summary: ICE on x86_64-linux-gnu at -O0 (in extract_insn, at
recog.c:2287)
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: chengniansun at gmail dot com
Target Milestone: ---
The following code crashes the gcc trunk in both 32-bit and 64-bit modes at -O0
on x86_64-linux-gnu.
$: gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap : (reconfigured)
../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap : (reconfigured)
../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap : (reconfigured)
../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 6.0.0 20160211 (experimental) [trunk revision 233350] (GCC)
$:
$: gcc-trunk small.c
small.c: In function ¡®fn1¡¯:
small.c:4:20: warning: right shift count is negative [-Wshift-count-negative]
void fn1() { c = d >> ~(a || ~b); }
~~^~~~~~~~~~~~~
small.c:4:1: error: unrecognizable insn:
void fn1() { c = d >> ~(a || ~b); }
^~~~
(insn 7 6 8 2 (set (reg:QI 91)
(const_int 254 [0xfe])) small.c:4 -1
(nil))
small.c:4:1: internal compiler error: in extract_insn, at recog.c:2287
0xad889a _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../gcc-source-trunk/gcc/rtl-error.c:108
0xad88c9 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
../../gcc-source-trunk/gcc/rtl-error.c:116
0xaa5ce7 extract_insn(rtx_insn*)
../../gcc-source-trunk/gcc/recog.c:2287
0x883932 instantiate_virtual_regs_in_insn
../../gcc-source-trunk/gcc/function.c:1582
0x883932 instantiate_virtual_regs
../../gcc-source-trunk/gcc/function.c:1950
0x883932 execute
../../gcc-source-trunk/gcc/function.c:1999
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.
$:
$: cat small.c
char a, c;
unsigned short b;
unsigned d;
void fn1() { c = d >> ~(a || ~b); }
int main() {}
$:
