[PATCH][2/4][committed] aarch64: Add memmove expansion for +mops

Mon, 13 Dec 2021 06:30:53 -0800 

Hi all,

This second patch in the series adds an inline movmem expansion for TARGET_MOPS
that emits the recommended sequence.

A new param aarch64-mops-memmove-size-threshold is added to control the memmove 
size threshold
for this expansion. Its default value is zero to be consistent with the current 
behaviour where
we always emit a libcall, as we don't currently have a movmem inline expansion
(we should add a compatible-everywhere inline expansion, but that's for the 
future), so we should
always prefer to emit the MOPS sequence when available in lieu of a libcall.

Bootstrapped and tested on aarch64-none-linux-gnu.
Pushing to trunk.
Thanks,
Kyrill

gcc/ChangeLog:

        * config/aarch64/aarch64.md (aarch64_movmemdi): Define.
        (movmemdi): Define.
        (unspec): Add UNSPEC_MOVMEM.
        * config/aarch64/aarch64.opt (aarch64-mops-memmove-size-threshold):
        New param.

gcc/testsuite/ChangeLog:

        * gcc.target/aarch64/mops_2.c: New test.

Attachment: mops_2.patch
Description: mops_2.patch

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