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Parameters for AArch64 processor

Hello,
I'm trying to compile an old code with an AArch64 processor but it's leading to memory leaks. After some troubleshooting, I have been able to locate one potential hot spot that includes the following definitions:

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#define MAXCHAR 255
#define MAXSHORT 32767
#define MINSHORT -32768
#define MAXTABLE 32500
#define BITS_PER_WORD 32
#define WORDSIZE(n) (((n)+(BITS_PER_WORD-1))/BITS_PER_WORD)
#define BIT(r, n) ((((r)[(n)>>5])>>((n)&31))&1)
#define SETBIT(r, n) ((r)[(n)>>5]|=((unsigned)1<<((n)&31)))
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

These values are unlikely to be accurate for an AArch64 CPU and I was wondering if anyone has any suggestions on what values to assign (note: the compiler is GCC-11). Thank you.  

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