gcc/testsuite/gcc.dg/fold-eqandshift-1.c

   1 /* PR middle-end/21137  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -fdump-tree-original" } */
   4 extern void foo();
   5
   6 void test1(int a)
   7 {
   8   if ((a >> 3) & 1)
   9     foo ();
  10 }
  11
  12 void test2(int b)
  13 {
  14   if ((b >> 3) & 4)
  15     foo ();
  16 }
  17
  18 int test3(int c)
  19 {
  20   return (c >> 3) & 1;
  21 }
  22
  23 int test4(int d)
  24 {
  25   return (d >> 3) & 4;
  26 }
  27
  28 #if __INT_MAX__ == 32767
  29 #define INT_BITS 16
  30 #elif __INT_MAX__ == 2147483647
  31 #define INT_BITS 32
  32 #elif __INT_MAX__ == 9223372036854775807
  33 #define INT_BITS 64
  34 #else
  35 #error Please add support for your target here.
  36 #endif
  37
  38 void test5(int e)
  39 {
  40   if ((e >> (INT_BITS - 1)) & 64)
  41     foo();
  42 }
  43
  44 void test6(unsigned int f)
  45 {
  46   if ((f >> (INT_BITS - 1)) & 64)
  47     foo();
  48 }
  49
  50 /* { dg-final { scan-tree-dump-times "\\(a \& 8\\) != 0" 1 "original" } } */
  51 /* { dg-final { scan-tree-dump-times "\\(b \& 32\\) != 0" 1 "original" } } */
  52 /* { dg-final { scan-tree-dump-times "c >> 3 \& 1" 1 "original" } } */
  53 /* { dg-final { scan-tree-dump-times "d >> 3 \& 4" 1 "original" } } */
  54 /* { dg-final { scan-tree-dump-times "e < 0" 1 "original" } } */
  55 /* { dg-final { scan-tree-dump-times "if \\(0\\)" 1 "original" } } */