diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/fpu/s_llroundf.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/fpu/s_llroundf.S | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/fpu/s_llroundf.S b/sysdeps/powerpc/powerpc64/fpu/s_llroundf.S new file mode 100644 index 0000000000..ff923056b1 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/fpu/s_llroundf.S @@ -0,0 +1,59 @@ +/* llroundf function. PowerPC64 version. + Copyright (C) 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> + + .section ".toc","aw" +.LC0: /* -0.0 */ + .tc FD_00000000_0[TC],0x0000000000000000 +.LC1: /* 0.5 */ + .tc FD_3fe00000_0[TC],0x3fe0000000000000 + .section ".text" + +/* long long [r3] llroundf (float x [fp1]) + IEEE 1003.1 llroundf function. IEEE specifies "roundf to the nearest + integer value, roundfing halfway cases away from zero, regardless of + the current roundfing mode." However PowerPC Architecture defines + "roundf to Nearest" as "Choose the best approximation. In case of a + tie, choose the one that is even (least significant bit o).". + So we can't use the PowerPC "round to Nearest" mode. Instead we set + "round toward Zero" mode and round by adding +-0.5 before rounding + to the integer value. */ + +ENTRY (__llroundf) + lfd fp12,.LC0@toc(2) + lfd fp10,.LC1@toc(2) + fcmpu cr6,fp1,fp12 /* if (x < 0.0) */ + fsubs fp3,fp1,fp10 /* x-= 0.5; */ + ble- cr6,.L9 + fadds fp3,fp1,fp10 /* x+= 0.5; */ +.L9: + fctidz fp2,fp3 /* Convert To Integer DW round toward 0. */ + stfd fp2,-16(r1) + nop /* Insure the following load is in a different dispatch group */ + nop /* to avoid pipe stall on POWER4&5. */ + nop + ld r3,-16(r1) + blr + END (__llroundf) + +strong_alias (__llroundf, __lroundf) +weak_alias (__llroundf, llroundf) +weak_alias (__lroundf, lroundf) + |