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

   1 /* Skip on MIPS/ARC, where LOGICAL_OP_NON_SHORT_CIRCUIT inhibits the setcc
   2    optimizations that expose the VRP opportunity.  */
   3 /* Skip on S/390 and avr.  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 { ! "mips*-*-* arc*-*-* s390*-*-*  avr-*-* mn10300-*-*" } } } */
   7 /* { dg-options "-O2 -fdump-tree-vrp1 -fdump-tree-dom1 -fdump-tree-vrp2" } */
   8 /* { dg-additional-options "-march=i586" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
   9 /* Skip on ARM Cortex-M, where LOGICAL_OP_NON_SHORT_CIRCUIT is set to false,
  10    leading to two conditional jumps when evaluating an && condition.  VRP is
  11    not able to optimize this.  */
  12 /* { dg-skip-if "" { arm_cortex_m } } */
  13
  14 int h(int x, int y)
  15 {
  16   if ((x >= 0 && x <= 1) && (y >= 0 && y <= 1))
  17     return x && y;
  18   else
  19     return -1;
  20 }
  21
  22 int g(int x, int y)
  23 {
  24   if ((x >= 0 && x <= 1) && (y >= 0 && y <= 1))
  25     return x || y;
  26   else
  27     return -1;
  28 }
  29
  30 int f(int x)
  31 {
  32   if (x != 0 && x != 1)
  33     return -2;
  34
  35   else
  36     return !x;
  37 }
  38
  39 /* Test that x and y are never compared to 0 -- they're always known to be
  40    0 or 1.  */
  41 /* { dg-final { scan-tree-dump-times "\[xy\]\[^ \]* !=" 0 "vrp1" } } */
  42
  43 /* These two are fully simplified by VRP1.  */
  44 /* { dg-final { scan-tree-dump-times "x\[^ \]* \[|\] y" 1 "vrp1" } } */
  45 /* { dg-final { scan-tree-dump-times "x\[^ \]* \\^ 1" 1 "vrp1" } } */
  46
  47 /* VRP2 gets rid of the remaining & 1 operations, x and y are always
  48    either 0 or 1.  */
  49 /* { dg-final { scan-tree-dump-times " & 1;" 0 "vrp2" } } */
  50
  51 /* { dg-final { cleanup-tree-dump "vrp1" } } */
  52 /* { dg-final { cleanup-tree-dump "dom1" } } */
  53 /* { dg-final { cleanup-tree-dump "vrp2" } } */