> PR target/78660
> * lra-constraints.c (curr_insn_transform): Handle
> WORD_REGISTER_OPERATIONS requirements when reloading SUBREGs.
> ---
> gcc/lra-constraints.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
> index 22323b2..f29308f 100644
> --- a/gcc/lra-constraints.c
> +++ b/gcc/lra-constraints.c
> @@ -4130,7 +4130,14 @@ curr_insn_transform (bool check_only_p)
> && (goal_alt[i] == NO_REGS
>
> || (simplify_subreg_regno
>
> (ira_class_hard_regs[goal_alt[i]][0],
> - GET_MODE (reg), byte, mode) >= 0)))))
> + GET_MODE (reg), byte, mode) >= 0)))
> + /* WORD_REGISTER_OPERATIONS targets require the
register
> + to be reloaded when the outer mode is strictly
> + narrower than the inner mode. Note: It may be
> + necessary to always reload the inner mode here but
it
> + requires further investigation. */
> + || (GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE
(reg))
> + && WORD_REGISTER_OPERATIONS)))
> {
> if (type == OP_OUT)
> type = OP_INOUT;
You want GET_MODE_PRECISION instead of GET_MODE_SIZE here.
--
Eric Botcazou
