http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56539
Bug #: 56539
Summary: [4.6/4.7/4.8 Regression] ICE: verify_ssa failed:
caused by -foptimize-sibling-calls
Classification: Unclassified
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Keywords: ice-on-valid-code, wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: r...@gcc.gnu.org
short string2int( const char * buf, unsigned len )
{
return (len > 1) ? ( buf[len-1] - '0' ) + (short)10 * string2int(buf,
len-1) : ( *buf - '0' );
}
#include <assert.h>
int main()
{
assert( string2int("13", 2) == 13);
return 0;
}
At -O2 this program fails the assertion with 4.6 and 4.7
A 4.8 build with --enable-checking gets an ICE in verify_ssa
$ ~/gcc/4.8/bin/gcc t.c -O2
t.c: In function 'string2int':
t.c:12:1: error: definition in block 3 follows the use
}
^
for SSA_NAME: _15 in statement:
acc_tmp_17 = (short int) _15;
t.c:12:1: internal compiler error: verify_ssa failed
0xa57004 verify_ssa(bool)
../../gcc-4.8/gcc/tree-ssa.c:1049
0x83ea9e execute_function_todo
../../gcc-4.8/gcc/passes.c:1967
0x83f56c execute_todo
../../gcc-4.8/gcc/passes.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.
Using -fno-optimize-sibling-calls makes the bug go away for all versions.
