On 11/13/22 16:05, Christoph Muellner wrote:
From: Christoph Müllner <christoph.muell...@vrull.eu>
The current implementation of riscv_block_move_straight() emits a couple
of load-store pairs with maximum width (e.g. 8-byte for RV64).
The remainder is handed over to move_by_pieces(), which emits code based
target settings like slow_unaligned_access and overlap_op_by_pieces.
move_by_pieces() will emit overlapping memory accesses with maximum
width only if the given length exceeds the size of one access
(e.g. 15-bytes for 8-byte accesses).
This patch changes the implementation of riscv_block_move_straight()
such, that it preserves a remainder within the interval
[delta..2*delta) instead of [0..delta), so that overlapping memory
access may be emitted (if the requirements for them are given).
gcc/ChangeLog:
* config/riscv/riscv-string.c (riscv_block_move_straight):
Adjust range for emitted load/store pairs.
The change to riscv_expand_block_move isn't noted in the ChangeLog. OK
with that fixed (I'm assuming you want to attempt to use overlapping
word ops for that case).
jeff
