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/* lround function. PowerPC32 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., 1 Franklin Street, Fifth Floor, Boston MA
02110-1301 USA. */
#include <sysdep.h>
#include <math_ldbl_opt.h>
.section .rodata.cst8,"aM",@progbits,8
.align 2
.LC0: /* 0.0 */
.long 0x00000000
.LC1: /* 0.5 */
.long 0x3f000000
.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)
stwu r1,-16(r1)
cfi_adjust_cfa_offset (16)
#ifdef SHARED
mflr r11
cfi_register(lr,r11)
# ifdef HAVE_ASM_PPC_REL16
bcl 20,31,1f
1: mflr r9
addis r9,r9,.LC0-1b@ha
addi r9,r9,.LC0-1b@l
# else
bl _GLOBAL_OFFSET_TABLE_@local-4
mflr r10
lwz r9,.LC0@got(10)
# endif
mtlr r11
cfi_same_value (lr)
lfs fp12,0(r9)
#else
lis r9,.LC0@ha
lfs fp12,.LC0@l(r9)
#endif
#ifdef SHARED
lfs fp10,.LC1-.LC0(r9)
#else
lis r9,.LC1@ha
lfs 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 /* Ensure the following load is in a different dispatch */
nop /* group to avoid pipe stall on POWER4&5. */
nop
lwz r3,12(r1)
addi r1,r1,16
blr
.L4:
fsub fp1,fp1,fp10 /* x-= 0.5; */
b .L9
END (__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
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
compat_symbol (libm, __lround, lroundl, GLIBC_2_1)
#endif
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