gcc/testsuite/gcc.dg/tree-ssa/assoc-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-optimized-raw -fno-tree-reassoc" } */
   3
   4 int f0(int a,int b,int c){
   5   int d = a + b;
   6   int e = c + b;
   7   return d - e;
   8 }
   9 int f1(int a,int b,int c){
  10   int d = a + b;
  11   int e = b - c;
  12   return d - e;
  13 }
  14 int f2(int a,int b,int c){
  15   int d = a + b;
  16   int e = c - b;
  17   return e + d;
  18 }
  19 int f3(int a,int b,int c){
  20   int d = a - b;
  21   int e = c - b;
  22   return d - e;
  23 }
  24 int f4(int a,int b,int c){
  25   int d = b - a;
  26   int e = c - b;
  27   return e + d;
  28 }
  29
  30 /* { dg-final { scan-tree-dump-times "plus_expr" 2 "optimized" } } */
  31 /* { dg-final { scan-tree-dump-times "minus_expr" 3 "optimized" } } */