gcc/testsuite/gcc.dg/tree-ssa/vrp47.c

   1 /* Setting LOGICAL_OP_NON_SHORT_CIRCUIT to 0 inhibits the setcc
   2    optimizations that expose the VRP opportunity.  */
   3 /* Skip on S/390.  Lower values in BRANCH_COST lead to two conditional
   4    jumps when evaluating an && condition.  VRP is not able to optimize
   5    this.  */
   6 /* { dg-do compile { target { ! { logical_op_short_circuit || { s390*-*-* mn10300-*-* hppa*-*-* m68k*-*-* } } } } } */
   7 /* { dg-options "-O2 -fdump-tree-vrp1 -fdump-tree-dom2 -fdump-tree-vrp2" } */
   8 /* { dg-additional-options "-march=i586" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
   9
  10 int h(int x, int y)
  11 {
  12   if ((x >= 0 && x <= 1) && (y >= 0 && y <= 1))
  13     return x && y;
  14   else
  15     return -1;
  16 }
  17
  18 int g(int x, int y)
  19 {
  20   if ((x >= 0 && x <= 1) && (y >= 0 && y <= 1))
  21     return x || y;
  22   else
  23     return -1;
  24 }
  25
  26 int f(int x)
  27 {
  28   if (x != 0 && x != 1)
  29     return -2;
  30
  31   else
  32     return !x;
  33 }
  34
  35 /* Test that x and y are never compared to 0 -- they're always known to be
  36    0 or 1.  */
  37 /* { dg-final { scan-tree-dump-times "\[xy\]\[^ \]* !=" 0 "vrp1" } } */
  38
  39 /* These two are fully simplified by VRP1.  */
  40 /* { dg-final { scan-tree-dump-times "x\[^ \]* \[|\] y" 1 "vrp1" } } */
  41 /* { dg-final { scan-tree-dump-times "x\[^ \]* \\^ 1" 1 "vrp1" } } */
  42
  43 /* VRP2 gets rid of the remaining & 1 operations, x and y are always
  44    either 0 or 1.  */
  45 /* { dg-final { scan-tree-dump-times " & 1;" 0 "vrp2" } } */
  46