gcc/testsuite/gcc.target/arm/pr37780_1.c

   1 /* Test that we can remove the conditional move due to CLZ
   2    being defined at zero.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-require-effective-target arm_arch_v5_ok } */
   6 /* { dg-options "-O2" } */
   7
   8 int
   9 fooctz (int i)
  10 {
  11   return (i == 0) ? 32 : __builtin_ctz (i);
  12 }
  13
  14 int
  15 fooctz2 (int i)
  16 {
  17   return (i != 0) ? __builtin_ctz (i) : 32;
  18 }
  19
  20 unsigned int
  21 fooctz3 (unsigned int i)
  22 {
  23   return (i > 0) ?  __builtin_ctz (i) : 32;
  24 }
  25
  26 /* { dg-final { scan-assembler-times "rbit\t*" 3 } } */
  27
  28 int
  29 fooclz (int i)
  30 {
  31   return (i == 0) ? 32 : __builtin_clz (i);
  32 }
  33
  34 int
  35 fooclz2 (int i)
  36 {
  37   return (i != 0) ? __builtin_clz (i) : 32;
  38 }
  39
  40 unsigned int
  41 fooclz3 (unsigned int i)
  42 {
  43   return (i > 0) ? __builtin_clz (i) : 32;
  44 }
  45
  46 /* { dg-final { scan-assembler-times "clz\t" 6 } } */
  47 /* { dg-final { scan-assembler-not "cmp\t.*0" } } */