gcc/testsuite/gcc.target/aarch64/pr37780_1.c

   1 /* Test that we can remove the conditional move due to CLZ
   2    and CTZ being defined at zero.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O2" } */
   6
   7 int
   8 fooctz (int i)
   9 {
  10   return (i == 0) ? 32 : __builtin_ctz (i);
  11 }
  12
  13 int
  14 fooctz2 (int i)
  15 {
  16   return (i != 0) ? __builtin_ctz (i) : 32;
  17 }
  18
  19 unsigned int
  20 fooctz3 (unsigned int i)
  21 {
  22   return (i > 0) ?  __builtin_ctz (i) : 32;
  23 }
  24
  25 /* { dg-final { scan-assembler-times "rbit\t*" 3 } } */
  26
  27 int
  28 fooclz (int i)
  29 {
  30   return (i == 0) ? 32 : __builtin_clz (i);
  31 }
  32
  33 int
  34 fooclz2 (int i)
  35 {
  36   return (i != 0) ? __builtin_clz (i) : 32;
  37 }
  38
  39 unsigned int
  40 fooclz3 (unsigned int i)
  41 {
  42   return (i > 0) ? __builtin_clz (i) : 32;
  43 }
  44
  45 /* { dg-final { scan-assembler-times "clz\t" 6 } } */
  46 /* { dg-final { scan-assembler-not "cmp\t.*0" } } */