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These intrinsics are available when the CRC32 architecture extension is specified, e.g. when the -march=armv8-a+crc switch is used, or when the target processor specified with -mcpu supports it.
crc32b r0, r0, r0
crc32h r0, r0, r0
crc32w r0, r0, r0
crc32w r0, r0, r0
instructions.
crc32cb r0, r0, r0
crc32ch r0, r0, r0
crc32cw r0, r0, r0
crc32cw r0, r0, r0
instructions.