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These built-in intrinsics for the ARMv8-A CRC32 extension are available when the -march=armv8-a+crc switch is used:
crc32b r0, r0, r0
crc32h r0, r0, r0
crc32w r0, r0, r0
crc32w r0, r0, r0
instructions for AArch32. One crc32w w0, w0, x0
instruction for
AArch64.
crc32cb r0, r0, r0
crc32ch r0, r0, r0
crc32cw r0, r0, r0
crc32cw r0, r0, r0
instructions for AArch32. One crc32cw w0, w0, x0
instruction for
AArch64.