Richard Biener <richard.guent...@gmail.com> writes: > I suppose the above should use immed_double_int_const (v, mode), too,
In practice it doesn't matter, because... > which oddly only ever truncates to mode for modes <= HOST_BITS_PER_WIDE_INT > via gen_int_mode. ...right. That's because there's not really any proper support for non-power-of-2 modes. Partial modes like PDI are specified by things like: PARTIAL_INT_MODE (DI); which is glaringly absent of any bit width. So if the constant is big enough to need 2 HWIs, it in practice must be exactly 2 HWIs wide. One of the advantages of wide_int is that it allows us to relax this restriction: we can have both (a) mode widths greater than HOST_BITS_PER_WIDE_INT*2 and (b) mode widths that are greater than HOST_BITS_PER_WIDE_INT while not being a multiple of it. In other words, one of the reasons wide_int can't be exactly 1:1 in practice is because it is clearing out these mistakes (GEN_INT rather than gen_int_mode) and missing features (non-power-of-2 widths). Richard
