gcc/testsuite/gcc.dg/guality/pr58791-5.c

   1 /* PR tree-optimization/58791 */
   2 /* { dg-do run } */
   3 /* { dg-options "-g" } */
   4
   5 #include "../nop.h"
   6
   7 __attribute__((noinline, noclone)) unsigned int
   8 foo (unsigned int a0, unsigned int a1, unsigned int a2,
   9      unsigned int a3, unsigned int a4)
  10 {
  11   unsigned int b0, b1, b2, b3, b4, e;
  12   /* this can be optimized to four additions... */
  13   b4 = a4 + a3 + a2 + a1 + a0;          /* { dg-final { gdb-test pr58791-5.c:20 "b4" "4681" } } */
  14   b3 = a3 + a2 + a1 + a0;               /* { dg-final { gdb-test pr58791-5.c:20 "b3" "585" } } */
  15   b2 = a2 + a1 + a0;                    /* { dg-final { gdb-test pr58791-5.c:20 "b2" "73" } } */
  16   b1 = a1 + a0;                         /* { dg-final { gdb-test pr58791-5.c:20 "b1" "9" } } */
  17   /* This is actually 0 */
  18   e = b4 - b3 + b2 - b1 - a4 - a2;      /* { dg-final { gdb-test pr58791-5.c:20 "e" "0" } } */
  19   asm volatile (NOP : : : "memory");
  20   asm volatile (NOP : : : "memory");
  21   return e;
  22 }
  23
  24 int
  25 main ()
  26 {
  27   foo (1, 8, 64, 512, 4096);
  28   return 0;
  29 }