gcc/testsuite/gcc.dg/tree-ssa/cltz-complement-max.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fno-tree-loop-optimize -fdump-tree-optimized" } */
   3
   4 #define PREC (__CHAR_BIT__)
   5
   6 #if __SIZEOF_INT__ < 4
   7 #define int __INT32_TYPE__
   8 #endif
   9
  10 int clz_complement_count1 (unsigned char b) {
  11     int c = 0;
  12
  13     while (b) {
  14         b >>= 1;
  15         c++;
  16     }
  17     if (c <= PREC)
  18       return 0;
  19     else
  20       return 34567;
  21 }
  22
  23 int clz_complement_count2 (unsigned char b) {
  24     int c = 0;
  25
  26     while (b) {
  27         b >>= 1;
  28         c++;
  29     }
  30     if (c <= PREC - 1)
  31       return 0;
  32     else
  33       return 76543;
  34 }
  35
  36 int ctz_complement_count1 (unsigned char b) {
  37     int c = 0;
  38
  39     while (b) {
  40         b <<= 1;
  41         c++;
  42     }
  43     if (c <= PREC)
  44       return 0;
  45     else
  46       return 23456;
  47 }
  48
  49 int ctz_complement_count2 (unsigned char b) {
  50     int c = 0;
  51
  52     while (b) {
  53         b <<= 1;
  54         c++;
  55     }
  56     if (c <= PREC - 1)
  57       return 0;
  58     else
  59       return 65432;
  60 }
  61 /* { dg-final { scan-tree-dump-times "34567" 0 "optimized" } } */
  62 /* { dg-final { scan-tree-dump-times "76543" 1 "optimized" } } */
  63 /* { dg-final { scan-tree-dump-times "23456" 0 "optimized" } } */
  64 /* { dg-final { scan-tree-dump-times "65432" 1 "optimized" } } */