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/* Round to int floating-point values. PowerPC32 version.
Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011
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. */
/* This has been coded in assembler because GCC makes such a mess of it
when it's coded in C. */
#include <sysdep.h>
#include <math_ldbl_opt.h>
/* double [fp1] nearbyint(double [fp1] x) */
.section .rodata.cst4,"aM",@progbits,4
.align 2
.LC0: /* 2**52 */
.long 0x59800000 /* TWO52: 2**52 */
.section ".text"
ENTRY (__nearbyint)
#ifdef SHARED
mflr r11
cfi_register(lr,r11)
bcl 20,31,1f
1: mflr r9
addis r9,r9,.LC0-1b@ha
lfs fp13,.LC0-1b@l(r9)
mtlr r11
cfi_same_value (lr)
#else
lis r9,.LC0@ha
lfs fp13,.LC0@l(r9)
#endif
fabs fp0,fp1
fsub fp12,fp13,fp13 /* generate 0.0 */
fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52 */
bgelr cr7
fcmpu cr7,fp1,fp12 /* if (x > 0.0 */
ble cr7,L(lessthanzero)
mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */
fadd fp0,fp1,fp13 /* x += TWO52 */
fsub fp1,fp0,fp13 /* x -= TWO52 */
fabs fp1,fp1 /* if (x == 0.0 */
mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */
blr
L(lessthanzero):
bgelr cr7
mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */
fsub fp0,fp13,fp1 /* x -= TWO52 */
fsub fp0,fp0,fp13 /* x += TWO52 */
fneg fp1,fp0 /* if (x == 0.0) */
mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */
blr
END (__nearbyint)
weak_alias (__nearbyint, nearbyint)
#ifdef NO_LONG_DOUBLE
weak_alias (__nearbyint, nearbyintl)
strong_alias (__nearbyint, __nearbyintl)
#endif
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
compat_symbol (libm, __nearbyint, nearbyintl, GLIBC_2_0)
#endif
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