gcc/testsuite/gcc.dg/combine_ashiftrt_2.c

   1 /* { dg-do compile {target arm*-*-* i?86-*-* powerpc-*-* sparc-*-*} } */
   2 /* { dg-options "-O2 -fdump-rtl-combine-all" } */
   3
   4 typedef long int32_t;
   5
   6 int32_t
   7 foo (int32_t a)
   8 {
   9   return (~a) >> 31;
  10 }
  11
  12 /* The combine phase will try to combine not & ashiftrt, and
  13    combine_simplify_rtx should transform (ashiftrt (not x) 31)
  14    to (not (ashiftrt x 63)) and then to (neg (ge x 0)). We look for
  15    the *attempt* to match this RTL pattern, regardless of whether an
  16    actual insn may be found on the platform.  */
  17 /* { dg-final { scan-rtl-dump "\\(neg:SI \\(ge:SI" "combine" } } */
  18 /* { dg-final { cleanup-rtl-dump "combine" } } */