[Bug middle-end/64327] ../../gcc/gcc/rtlanal.c:4881:48: runtime error: shift exponent 4294967295 is too large for 64-bit type 'long unsigned int'

[zeccav at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64327

--- Comment #4 from Vittorio Zecca <zeccav at gmail dot com> ---
For your convenience I repeat here the reproducer:
/* from gcc file fixopts.c */
/* must be compiled with -O2 */
/*gcc-5.1.0/gcc/rtlanal.c:4911:48: runtime error: shift exponent
4294967295 is too large for 64-bit type 'long unsigned int'*/
/*on source line "return nonzero & ((unsigned HOST_WIDE_INT) 1 <<
(bitwidth - 1))"*/
/* because unsigned int bitwidth is zero and bitwitdth-1 is 4294967295
on my x86-64 */
/* I did double check with:
 *   bitwidth = GET_MODE_PRECISION (mode);
 *   gcc_assert(bitwidth);
*/
/* the bug appears compiling fixopts.c crc32.c md5.c and many Fedora
21 kernel files*/
/* 66853 duplicato di 64327 */
int strcmp(const char *s1, const char *s2);
int  fixinc_mode; /* must be outside main for bug to appear */
int main (void)
{
 const char *pz;
 if (strcmp (pz, "true") ) fixinc_mode = 0;
}