diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/fpu/s_llround.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/fpu/s_llround.S | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/fpu/s_llround.S b/sysdeps/powerpc/powerpc64/fpu/s_llround.S new file mode 100644 index 0000000000..320ef0f6d8 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/fpu/s_llround.S @@ -0,0 +1,67 @@ +/* llround 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] llround (float x [fp1]) + IEEE 1003.1 llround function. IEEE specifies "round to the nearest + integer value, rounding halfway cases away from zero, regardless of + the current rounding mode." However PowerPC Architecture defines + "round 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 (__llround) + lfd fp12,.LC0@toc(2) + lfd fp10,.LC1@toc(2) + fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ + ble- cr6,.L4 + fadd fp1,fp1,fp10 /* x+= 0.5; */ +.L9: + fctidz fp2,fp1 /* Convert To Integer DW llround 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 +.L4: + fsub fp1,fp1,fp10 /* x-= 0.5; */ + b .L9 + END (__llround) + +strong_alias (__llround, __lround) +weak_alias (__llround, llround) +weak_alias (__lround, lround) + +#ifdef NO_LONG_DOUBLE +weak_alias (__llround, llroundl) +strong_alias (__llround, __llroundl) +weak_alias (__lround, lroundl) +strong_alias (__lround, __lroundl) +#endif |