6.12 __crc32cb, __crc32ch, __crc32cw, __crc32cd Intrinsic Function

Calculates a CRC32C checksum from a checksum (or initial value) crc and one item of data.

Note: The 32-bit Arm/Thumb instructions do not include CRC32CX, so __crc32cd is implemented as two calls to __crc32cw.

These intrinsic functions are defined according to the Arm C Language Extensions (ACLE).

For XC32, __crc32cd is not supported.

Suggested Replacement

__builtin_arm_crc32cb
__builtin_arm_crc32ch
__builtin_arm_crc32cw

Caveats

None.

Examples

Consider migrating IAR code such as:
unsigned int __crc32cb(unsigned int crc, unsigned char data); 
unsigned int __crc32ch(unsigned int crc, unsigned short data); 
unsigned int __crc32cw(unsigned int crc, unsigned int data); 
unsigned int __crc32cd(unsigned int crc, unsigned long long data);
to MPLAB XC codes similar to:
unsigned int __builtin_arm_crc32cb(unsigned int crc, unsigned char data); 
unsigned int __builtin_arm_crc32ch(unsigned int crc, unsigned short data); 
unsigned int __builtin_arm_crc32cw(unsigned int crc, unsigned int data); 
unsigned int __builtin_arm_crc32cd(unsigned int crc, unsigned long long data);

Further Information

None.