allzeros.c

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#include <stdbool.h>
#include <stddef.h>
#include <string.h>

#define BLCKSZ 8192
#define LOOPS 1000000	/* 1M */

static inline bool
allzeros_char(const void *ptr, size_t len)
{
	const char *p = (const char *) ptr;

	for (size_t i = 0; i < len; i++)
	{
		if (p[i] != 0)
			return false;
	}
	return true;
}

static inline bool
allzeros_size_t(const void *ptr, size_t len)
{
	const size_t *p = (const size_t *) ptr;

	for (size_t i = 0; i < len / sizeof(size_t); i++)
	{
		if (p[i] != 0)
			return false;
	}
	return true;
}

int main()
{
	size_t pagebytes[BLCKSZ] = {0};

	for (int i = 0; i < LOOPS; i++)
	{
		allzeros_char(pagebytes, BLCKSZ);
		//allzeros_size_t(pagebytes, BLCKSZ);
	}

	return 0;
}