gcc/testsuite/gcc.dg/combine_ashiftrt_1.c

   1 /* Target architectures which have been found to produce the expected RTL
   2    (neg:DI (ge:DI ...)) when compiling for LP64.  */
   3 /* { dg-do compile { target aarch64*-*-* arm*-*-* i?86-*-* ia64-*-* powerpc*-*-* sparc*-*-* x86_64-*-* } } */
   4 /* { dg-require-effective-target lp64 } */
   5 /* { dg-options "-O2 -fdump-rtl-combine-all" } */
   6
   7 typedef long long int int64_t;
   8
   9 int64_t
  10 foo (int64_t a)
  11 {
  12   return (~a) >> 63;
  13 }
  14
  15 /* The combine phase will try to combine not & ashiftrt, and
  16    combine_simplify_rtx should transform (ashiftrt (not x) 63)
  17    to (not (ashiftrt x 63)) and then to (neg (ge x 0)). We look for
  18    the *attempt* to match this RTL pattern, regardless of whether an
  19    actual insn may be found on the platform.  */
  20 /* { dg-final { scan-rtl-dump "\\(neg:DI \\(ge:DI" "combine" } } */