fix: fix random rndints for 64 bits address space

int rand() could only generate random number in 0-2^31-1,
but the region size is size_t(64B), not all addresses in
the range could get accessed.

Signed-off-by: luzhixing12345 <[email protected]>

Author: luzhixing12345

configs/64.cfg

@@ -0,0 +1,23 @@
+#regions
+# name, length
+a, 2147483648
+b, 64
+c, 128
+
+# phase 1
+# name of phase
+example phase 1
+# time in ms
+1000
+# access patterns
+# name of region, randomness, stride, probability
+a, 1, 64, 80
+
+# phase 2
+example phase 2
+# time in ms
+1000
+# access patterns
+# name of region, randomness, stride, probability
+c, 1, 64, 50
+b, 0, 4096, 50

masim.c

@@ -87,22 +87,26 @@ struct access_config {
 
 #define RAND_BATCH	1000
 #define RAND_ARR_SZ	1000
-int rndints[RAND_BATCH][RAND_ARR_SZ];
+size_t rndints[RAND_BATCH][RAND_ARR_SZ];
+
+inline static size_t rand64() {
+	return ((size_t)rand() << 32) | rand();
+}
 
 static void init_rndints(void)
 {
 	int i, j;
 
 	for (i = 0; i < RAND_BATCH; i++)
 		for (j = 0; j < RAND_ARR_SZ; j++)
-			rndints[i][j] = rand();
+			rndints[i][j] = rand64();
 	rndints[0][0] = 1;
 }
 
 /*
  * Returns a random integer
  */
-static int rndint(void)
+static size_t rndint(void)
 {
 	static int rndofs;
 	static int rndarr;