mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
61 lines
2.1 KiB
ArmAsm
61 lines
2.1 KiB
ArmAsm
|
/* lround function. POWER5+, PowerPC32 version.
|
||
|
|
Copyright (C) 2006, 2007 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., 1 Franklin Street, Fifth Floor, Boston MA
|
||
|
|
02110-1301 USA. */
|
||
|
|
|
||
|
|
#include <sysdep.h>
|
||
|
|
#include <math_ldbl_opt.h>
|
||
|
|
|
||
|
|
/* long [r3] llround (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 pre-round using the V2.02 Floating Round to Integer Nearest
|
||
|
|
instruction before we use the Floating Convert to Integer Word with
|
||
|
|
round to zero instruction. */
|
||
|
|
|
||
|
|
.machine "power5"
|
||
|
|
ENTRY (__llround)
|
||
|
|
stwu r1,-16(r1)
|
||
|
|
cfi_adjust_cfa_offset (16)
|
||
|
|
frin fp2,fp1
|
||
|
|
fctidz fp3,fp2 /* Convert To Integer Word lround toward 0. */
|
||
|
|
stfd fp3,8(r1)
|
||
|
|
/* Insure the following load is in a different dispatch group by
|
||
|
|
inserting "group ending nop". */
|
||
|
|
ori r1,r1,0
|
||
|
|
lwz r4,12(r1)
|
||
|
|
lwz r3,8(r1)
|
||
|
|
addi r1,r1,16
|
||
|
|
blr
|
||
|
|
END (__llround)
|
||
|
|
|
||
|
|
weak_alias (__llround, llround)
|
||
|
|
|
||
|
|
strong_alias (__llround, __llroundf)
|
||
|
|
weak_alias (__llround, llroundf)
|
||
|
|
|
||
|
|
#ifdef NO_LONG_DOUBLE
|
||
|
|
weak_alias (__llround, llroundl)
|
||
|
|
strong_alias (__llround, __llroundl)
|
||
|
|
#endif
|
||
|
|
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
|
||
|
|
compat_symbol (libm, __llround, llroundl, GLIBC_2_1)
|
||
|
|
#endif
|