sysdeps/sparc/sparc64/fpu/multiarch/s_lrint-vis3.S

   1 /* lrint(), sparc64 vis3 version.
   2    Copyright (C) 2012-2023 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20
  21         /* VIS instructions are used to facilitate the formation of
  22            easier constants, and the propagation of the sign bit.  */
  23
  24 #define TWO_FIFTYTWO    0x43300000              /* 2**52 */
  25
  26 #define ZERO            %f10                    /* 0.0 */
  27 #define SIGN_BIT        %f12                    /* -0.0 */
  28
  29 ENTRY (__lrint_vis3)
  30         sethi   %hi(TWO_FIFTYTWO), %o2
  31         sllx    %o2, 32, %o2
  32         fzero   ZERO
  33
  34         fnegd   ZERO, SIGN_BIT
  35         movxtod %o2, %f16
  36         fabsd   %f0, %f14
  37
  38         fcmpd   %fcc3, %f14, %f16
  39
  40         fmovduge %fcc3, ZERO, %f16
  41         fand    %f0, SIGN_BIT, SIGN_BIT
  42
  43         for     %f16, SIGN_BIT, %f16
  44         faddd   %f0, %f16, %f6
  45         fsubd   %f6, %f16, %f0
  46         fabsd   %f0, %f0
  47         for     %f0, SIGN_BIT, %f0
  48         fdtox   %f0, %f4
  49         retl
  50          movdtox %f4, %o0
  51 END (__lrint_vis3)