Sorry for the typo
s/change/chance
在 2023/7/21 8:59, HAO CHEN GUI 写道:
> Hi Jeff,
>
> 在 2023/7/21 5:27, Jeff Law 写道:
>> Wouldn't it make more sense to just try rotate/mask in the original mode
>> before trying a shift in a widened mode? I'm not sure why we need a target
>> hook here.
>
> There is no change to try rotate/mask with the original mode when
> expensive_optimizations is set. The subst widens the shift mode.
>
> if (flag_expensive_optimizations)
> {
> /* Pass pc_rtx so no substitutions are done, just
> simplifications. */
> if (i1)
> {
> subst_low_luid = DF_INSN_LUID (i1);
> i1src = subst (i1src, pc_rtx, pc_rtx, 0, 0, 0);
> }
>
> subst_low_luid = DF_INSN_LUID (i2);
> i2src = subst (i2src, pc_rtx, pc_rtx, 0, 0, 0);
> }
>
> I don't know if the wider mode is helpful to other targets, so
> I added the target hook.
>
> Thanks
> Gui Haochen
