[Bug tree-optimization/109759] UBSAN error: shift exponent 64 is too large for 64-bit type 'long unsigned int'

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109759

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Odd, the code is explicitely guarded:

inline wi::hwi_with_prec::hwi_with_prec (HOST_WIDE_INT v, unsigned int p,
                                         signop s)
  : precision (p), sgn (s)
{
  if (precision < HOST_BITS_PER_WIDE_INT)
    val = sext_hwi (v, precision);

and in sext_hwi as well.