gcc/testsuite/gcc.dg/tree-ssa/pr69270.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fsplit-paths -fdump-tree-dom3-details" } */
   3
   4 /* There should be two references to bufferstep that turn into
   5    constants.  */
   6 /* { dg-final { scan-tree-dump-times "Replaced .bufferstep_\[0-9\]+. with constant .0." 1 "dom3"} } */
   7 /* { dg-final { scan-tree-dump-times "Replaced .bufferstep_\[0-9\]+. with constant .1." 1 "dom3"} } */
   8
   9 /* And some assignments ought to fold down to constants.  */
  10 /* { dg-final { scan-tree-dump-times "Folded to: _\[0-9\]+ = 1;" 1 "dom3"} } */
  11 /* { dg-final { scan-tree-dump-times "Folded to: _\[0-9\]+ = 0;" 1 "dom3"} } */
  12
  13 /* The XOR operations should have been optimized to constants.  */
  14 /* { dg-final { scan-tree-dump-not "bit_xor" "dom3"} } */
  15
  16
  17 extern int *stepsizeTable;
  18
  19 void
  20 adpcm_coder (signed char *outdata, int len)
  21 {
  22   signed char *outp;
  23   int delta;
  24   int outputbuffer;
  25   int bufferstep = 0;
  26   outp = (signed char *) outdata;
  27   int step = 0;
  28   int index = 0;
  29   int diff = 0;
  30   for (; len > 0; len--)
  31     {
  32       delta = 0;
  33       if (diff >= step)
  34         delta = 4;
  35       step = stepsizeTable[index];
  36       if (bufferstep)
  37         outputbuffer = (delta << 4) & 0xf0;
  38       else
  39         *outp++ = (delta & 0x0f) | outputbuffer;
  40       bufferstep = !bufferstep;
  41     }
  42 }