diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/fpu/s_lround.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/fpu/s_lround.S | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc32/fpu/s_lround.S b/sysdeps/powerpc/powerpc32/fpu/s_lround.S new file mode 100644 index 0000000000..dcb97e373b --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/s_lround.S @@ -0,0 +1,100 @@ +/* lround function. PowerPC32 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 .rodata + .align 3 + .type NEGZERO.0,@object + .size NEGZERO.0,8 +NEGZERO.0: + .long 0x00000000 + .long 0 + .type POINTFIVE.0,@object + .size POINTFIVE.0,8 +POINTFIVE.0: + .long 0x3fe00000 + .long 0 + + .section .rodata.cst8,"aM",@progbits,8 + .align 3 +.LC0: /* 0.0 */ + .long 0x00000000 + .long 0 +.LC1: /* 0.5 */ + .long 0x3fe00000 + .long 0 + + .section ".text" + +/* long [r3] lround (float x [fp1]) + IEEE 1003.1 lround 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 (__lround) +#ifdef SHARED + mflr r11 + bl _GLOBAL_OFFSET_TABLE_@local-4 + mflr r10 + lwz r9,.LC0@got(10) + mtlr r11 + lfd fp12,0(r9) +#else + lis r9,.LC0@ha + lfd fp12,.LC0@l(r9) +#endif +#ifdef SHARED + lwz r9,.LC1@got(10) + lfd fp10,0(r9) +#else + lis r9,.LC1@ha + lfd fp10,.LC1@l(r9) +#endif + fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ + ble- cr6,.L4 + fadd fp1,fp1,fp10 /* x+= 0.5; */ +.L9: + fctiwz fp2,fp1 /* Convert To Integer DW lround toward 0. */ + stfd fp2,-8(r1) + nop /* Insure the following load is in a different dispatch group */ + nop /* to avoid pipe stall on POWER4&5. */ + nop + lwz r3,-4(r1) + blr +.L4: + fsub fp1,fp1,fp10 /* x-= 0.5; */ + b .L9 + END (__lround) + +strong_alias (__lround, __lround) +weak_alias (__lround, lround) + +strong_alias (__lround, __lroundf) +weak_alias (__lround, lroundf) + +#ifdef NO_LONG_DOUBLE +weak_alias (__lround, lroundl) +strong_alias (__lround, __lroundl) +#endif |