first commit

datalab/src/tests.c

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+/* Testing Code */
+
+#include <limits.h>
+
+
+
+
+int test_bitAnd(int x, int y)
+{
+  return x&y;
+}
+
+
+
+
+
+
+int test_bitXor(int x, int y)
+{
+  return x^y;
+}
+
+
+
+
+
+
+int test_evenBits(void) {
+  int result = 0;
+  int i;
+  for (i = 0; i < 32; i+=2)
+    result |= 1<<i;
+  return result;
+}
+
+
+
+
+
+
+int test_getByte(int x, int n)
+{
+  union  {
+    int word;
+    unsigned char bytes[4];
+  } u;
+  int test = 1;
+  int littleEndian = (int) *(char *) &test;
+  u.word = x;
+  return littleEndian ? (unsigned) u.bytes[n] : (unsigned) u.bytes[3-n];
+}
+
+
+
+
+
+
+int test_bitMask(int highbit, int lowbit)
+{
+  int result = 0;
+  int i;
+  for (i = lowbit; i <= highbit; i++)
+    result |= 1 << i;
+  return result;
+}
+
+
+
+
+
+
+int test_reverseBytes(int x)
+{
+  union U {
+    int result;
+    char byte[4];
+  };
+  union U u;
+  int temp;
+  u.result = x;
+  temp = u.byte[0];
+  u.byte[0] = u.byte[3];
+  u.byte[3] = temp;
+  temp = u.byte[1];
+  u.byte[1] = u.byte[2];
+  u.byte[2] = temp;
+  return u.result;
+}
+
+
+
+
+
+
+int test_leastBitPos(int x) {
+  int mask = 1;
+
+  if (x == 0)
+    return 0;
+  while (!(mask & x)) {
+    mask = mask << 1;
+  }
+  return mask;
+}
+
+
+
+
+
+
+int test_logicalNeg(int x)
+{
+  return !x;
+}
+
+
+
+
+
+
+
+int test_minusOne(void) {
+  return -1;
+}
+
+
+
+
+
+
+int test_tmax(void) {
+  return LONG_MAX;
+}
+
+
+
+
+
+
+int test_negate(int x) {
+  return -x;
+}
+
+
+
+
+
+
+int test_isPositive(int x) {
+  return x > 0;
+}
+
+
+
+
+
+
+int test_isLess(int x, int y)
+{
+  return x < y;
+}
+
+
+
+
+
+
+int test_sm2tc(int x) {
+  int sign = x < 0;
+  int mag  = x & LONG_MAX;
+  return sign ? -mag : mag;
+}
+
+
+