sysdeps/powerpc/powerpc64/fpu/s_floorf.S

   1 /* float Floor function.  PowerPC64 version.
   2    Copyright (C) 2004-2016 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 <sysdep.h>
  20
  21         .section        ".toc","aw"
  22         .p2align 3
  23 .LC0:   /* 2**23 */
  24         .long 0x4b000000
  25         .long 0x0
  26         .section        ".text"
  27
  28 EALIGN (__floorf, 4, 0)
  29         CALL_MCOUNT 0
  30         lfs     fp13,.LC0@toc(2)
  31         fabs    fp0,fp1
  32         fsubs   fp12,fp13,fp13  /* generate 0.0  */
  33         fcmpu   cr7,fp0,fp13    /* if (fabs(x) > TWO23)  */
  34         mffs    fp11            /* Save current FPU rounding mode and
  35                                    "inexact" state.  */
  36         fcmpu   cr6,fp1,fp12    /* if (x > 0.0)  */
  37         bnllr-  cr7
  38         mtfsfi  7,3             /* Set rounding mode toward -inf.  */
  39         ble-    cr6,.L4
  40         fadds   fp1,fp1,fp13    /* x+= TWO23;  */
  41         fsubs   fp1,fp1,fp13    /* x-= TWO23;  */
  42         fabs    fp1,fp1         /* if (x == 0.0)  */
  43                                 /* x = 0.0; */
  44         mtfsf   0xff,fp11       /* Restore previous rounding mode and
  45                                    "inexact" state.  */
  46         blr
  47 .L4:
  48         bge-    cr6,.L9         /* if (x < 0.0)  */
  49         fsubs   fp1,fp1,fp13    /* x-= TWO23;  */
  50         fadds   fp1,fp1,fp13    /* x+= TWO23;  */
  51         fnabs   fp1,fp1         /* if (x == 0.0)  */
  52                                 /* x = -0.0; */
  53 .L9:
  54         mtfsf   0xff,fp11       /* Restore previous rounding mode and
  55                                    "inexact" state.  */
  56         blr
  57         END (__floorf)
  58
  59 weak_alias (__floorf, floorf)
  60