tests2/55_lshift_type.c

   1 /* $Id: lshift-type.c 53089 2012-07-06 11:18:26Z vinc17/ypig $
   2
   3 Tests on left-shift type, written by Vincent Lefevre <vincent@vinc17.net>.
   4
   5 ISO C99 TC3 says: [6.5.7#3] "The integer promotions are performed on
   6 each of the operands. The type of the result is that of the promoted
   7 left operand."
   8 */
   9
  10 #include <stdio.h>
  11
  12 #define PTYPE(M) ((M) < 0 || -(M) < 0 ? -1 : 1) * (int) sizeof((M)+0)
  13 #define CHECK(X,T) check(#X, PTYPE(X), PTYPE((X) << (T) 1))
  14 #define TEST1(X,T) do { CHECK(X,T); CHECK(X,unsigned T); } while (0)
  15 #define TEST2(X)                 \
  16   do                             \
  17     {                            \
  18       TEST1((X),short);          \
  19       TEST1((X),int);            \
  20       TEST1((X),long);           \
  21       TEST1((X),long long);      \
  22     }                            \
  23   while (0)
  24 #define TEST3(X,T) do { TEST2((T)(X)); TEST2((unsigned T)(X)); } while (0)
  25 #define TEST4(X)                 \
  26   do                             \
  27     {                            \
  28       TEST3((X),short);          \
  29       TEST3((X),int);            \
  30       TEST3((X),long);           \
  31       TEST3((X),long long);      \
  32     }                            \
  33  while (0)
  34
  35 static int debug, nfailed = 0;
  36
  37 static void check (const char *s, int arg1, int shift)
  38 {
  39   int failed = arg1 != shift;
  40   if (debug || failed)
  41     printf ("%s %d %d\n", s, arg1, shift);
  42   nfailed += failed;
  43 }
  44
  45 int main (int argc, char **argv)
  46 {
  47   debug = argc > 1;
  48   TEST4(1);
  49   TEST4(-1);
  50   printf ("%d test(s) failed\n", nfailed);
  51   return nfailed != 0;
  52 }