mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
74 lines
2.5 KiB
ArmAsm
74 lines
2.5 KiB
ArmAsm
/* llround function. PowerPC64 version.
|
|
Copyright (C) 2004, 2006 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>
|
|
#include <math_ldbl_opt.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)
|
|
CALL_MCOUNT 0
|
|
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
|
|
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
|
|
compat_symbol (libm, __llround, llroundl, GLIBC_2_1)
|
|
compat_symbol (libm, __lround, lroundl, GLIBC_2_1)
|
|
#endif
|