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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. 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.
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