[compiler-rt][aarch64][sme] Add SVE/FP variant of __arm_sc_memcpy
#127093
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When SVE is available use the `-sve` variant of memcpy from AOR for `__arm_sc_memcpy`. From: https://github.com/ARM-software/optimized-routines/blob/71e36403858ab3ff743fcde336fb31890e57af7e/string/aarch64/memcpy-sve.S This implementation uses FPR/ZPR load/store instructions to do the copy, so should not cause memory hazards if called in streaming mode (with the memory later being accessed in the streaming mode with SVE/SME instructions). The implementation has been slightly modified from AOR to use local labels (matching other compiler-rt functions) but still passes the memcpy and memmove tests from AOR.
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When SVE is available use the
-svevariant of memcpy from AOR for__arm_sc_memcpy. From: https://github.com/ARM-software/optimized-routines/blob/71e36403858ab3ff743fcde336fb31890e57af7e/string/aarch64/memcpy-sve.SThis implementation uses FPR/ZPR load/store instructions to do the copy, so should not cause memory hazards if called in streaming mode (with the memory later being accessed in the streaming mode with SVE/SME instructions).
The implementation has been slightly modified from AOR to use local labels (matching other compiler-rt functions) but still passes the memcpy and memmove tests from AOR.