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/* Round float to int floating-point values without generating
an inexact exception, sparc32 v9 version.
Copyright (C) 2013-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David S. Miller <davem@davemloft.net>, 2013.
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, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <math_ldbl_opt.h>
/* We pop constants into the FPU registers using the incoming
argument stack slots, since this avoid having to use any PIC
references. We also thus avoid having to allocate a register
window.
VIS instructions are used to facilitate the formation of
easier constants, and the propagation of the sign bit. */
#define TWO_FIFTYTWO 0x43300000 /* 2**52 */
#define ZERO %f10 /* 0.0 */
#define SIGN_BIT %f12 /* -0.0 */
ENTRY (__nearbyint)
fcmpd %fcc3, %f0, %f0 /* Check for sNaN */
st %fsr, [%sp + 88]
sethi %hi(TWO_FIFTYTWO), %o2
sethi %hi(0xf8003e0), %o5
ld [%sp + 88], %o4
sllx %o0, 32, %o0
or %o5, %lo(0xf8003e0), %o5
or %o0, %o1, %o0
andn %o4, %o5, %o4
fzero ZERO
st %o4, [%sp + 80]
stx %o0, [%sp + 72]
sllx %o2, 32, %o2
fnegd ZERO, SIGN_BIT
ldd [%sp + 72], %f0
ld [%sp + 80], %fsr
stx %o2, [%sp + 72]
fabsd %f0, %f14
ldd [%sp + 72], %f16
fcmpd %fcc3, %f14, %f16
fmovduge %fcc3, ZERO, %f16
fand %f0, SIGN_BIT, SIGN_BIT
for %f16, SIGN_BIT, %f16
faddd %f0, %f16, %f6
fsubd %f6, %f16, %f0
fabsd %f0, %f0
for %f0, SIGN_BIT, %f0
retl
ld [%sp + 88], %fsr
END (__nearbyint)
weak_alias (__nearbyint, nearbyint)
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
compat_symbol (libm, __nearbyint, nearbyintl, GLIBC_2_1)
#endif
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