[Sorry for the delay]
> gen_rtx_CONST_VECTOR ensures that there is a single instance of:
>
>(const_vector:M [(const_int -1) ... (const_int -1)])
>
> for each M, so pointer equality with CONSTM1_RTX is enough. Also,
> HOST_BITS_PER_WIDE_INT == 32 is doubly dead: HOST_WIDE_INT is always
> 64
gen_rtx_CONST_VECTOR ensures that there is a single instance of:
(const_vector:M [(const_int -1) ... (const_int -1)])
for each M, so pointer equality with CONSTM1_RTX is enough. Also,
HOST_BITS_PER_WIDE_INT == 32 is doubly dead: HOST_WIDE_INT is always
64 bits now, and we always use const_int
