message: [OPENMP][NVPTX]Enable fast shuffles on 64bit values only if CUDA >= 9.
  Summary:
  Shuffle on 64bit data is allowed only for CUDA >= 9.0. Also, fixed the
  constant for the mask, need one extra L in the end.
  Reviewers: gtbercea, kkwli0
  Subscribers: guansong, caomhin, openmp-commits
diff: @@ -76,7 +76,17 @@ EXTERN int32_t __kmpc_shuffle_int32(int32_t val, int16_t delta, int16_t size) {
  }
  EXTERN int64_t __kmpc_shuffle_int64(int64_t val, int16_t delta, int16_t size) {
  - return __SHFL_DOWN_SYNC(0xFFFFFFFFFFFFFFFFL, val, delta, size);
  +#if defined(CUDART_VERSION) && CUDART_VERSION >= 9000
  + return __SHFL_DOWN_SYNC(0xFFFFFFFFFFFFFFFFLL, (long long)val, (unsigned)delta,
  + (int)size);
  +#else
  + int lo, hi;
  + asm volatile("mov.b64 {%0,%1}, %2;" : "=r"(lo), "=r"(hi) : "l"(val));
  + hi = __SHFL_DOWN_SYNC(0xFFFFFFFF, hi, delta, size);
  + lo = __SHFL_DOWN_SYNC(0xFFFFFFFF, lo, delta, size);
  + asm volatile("mov.b64 %0, {%1,%2};" : "=l"(val) : "r"(lo), "r"(hi));
  + return val;
  +#endif
  }
  static INLINE void gpu_regular_warp_reduce(void *reduce_data,
  