Steve Ellcey wrote:
> And in aarch64 rtl expansion I see:
>
> (insn 10 9 11 (set (reg:QI 81)
> (mem:QI (reg/v/f:DI 80 [ string ]) [0 *string_9(D)+0 S1 A8]))
> "pr77729.c":3 -1
> (nil))
Yes using QI/HI mode anywhere in the RTL seems perverse and incorrect given
AArch64
doesn't support registers narrower than 32 bits. Shift counts seem to have the
same
issue and expand into very complex sequences of ANDs with subreg - and nobody
seems
to understand what subreg really means...
My feeling is that we should only use SI/DI mode in patterns and aggressively
widen all
8/16-bit operations to SI mode (which is what C requires anyway).
Wilco
