gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-30.c

   1 /* PR tree-optimization/80933 - redundant bzero/bcopy calls not eliminated
   2    { dg-do compile }
   3    { dg-options "-O2 -fdump-tree-dse1" } */
   4
   5 void sink (void*);
   6
   7 void test_bcopy (const void *s)
   8 {
   9   char d[33];
  10
  11   /* Bcopy is transformed into memmove and those calls are expanded
  12      inline in EVRP, before DSE runs, so this test doesn't actually
  13      verify that DSE does its job.  */
  14   __builtin_bcopy (s, d, sizeof d);
  15   __builtin_bcopy (s, d, sizeof d);
  16
  17   sink (d);
  18 }
  19
  20 void test_bzero (void)
  21 {
  22   char d[33];
  23
  24   __builtin_bzero (d, sizeof d);
  25   __builtin_bzero (d, sizeof d);
  26
  27   sink (d);
  28 }
  29
  30 /* { dg-final { scan-tree-dump-times "builtin_memset" 1 "dse1" } } */
  31 /* { dg-final { scan-tree-dump-not "builtin_(bcopy|bzero|memcpy|memmove)" "dse1" } } */