1  /* Definitions for memory copy functions, PA-RISC version.
       2     Copyright (C) 2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <http://www.gnu.org/licenses/>.  */
      18  
      19  #include <sysdeps/generic/memcopy.h>
      20  
      21  /* Use a single double-word shift instead of two shifts and an ior.
      22     If the uses of MERGE were close to the computation of shl/shr,
      23     the compiler might have been able to create this itself.
      24     But instead that computation is well separated.
      25  
      26     Using an inline function instead of a macro is the easiest way
      27     to ensure that the types are correct.  */
      28  
      29  #undef MERGE
      30  
      31  static __always_inline op_t
      32  MERGE (op_t w0, int shl, op_t w1, int shr)
      33  {
      34    _Static_assert (OPSIZ == 4 || OPSIZ == 8, "Invalid OPSIZE");
      35  
      36    op_t res;
      37    if (OPSIZ == 4)
      38      asm ("shrpw %1,%2,%%sar,%0" : "=r"(res) : "r"(w0), "r"(w1), "q"(shr));
      39    else if (OPSIZ == 8)
      40      asm ("shrpd %1,%2,%%sar,%0" : "=r"(res) : "r"(w0), "r"(w1), "q"(shr));
      41    return res;
      42  }