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/* Round float to int floating-point values without generating
an inexact exception, sparc64 version.
Copyright (C) 2013-2015 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>
/* 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)
stx %fsr, [%sp + STACK_BIAS + 144]
sethi %hi(TWO_FIFTYTWO), %o2
sllx %o2, 32, %o2
ldx [%sp + STACK_BIAS + 144], %o4
sethi %hi(0xf8003e0), %o5
fzero ZERO
or %o5, %lo(0xf8003e0), %o5
fnegd ZERO, SIGN_BIT
andn %o4, %o5, %o4
stx %o2, [%sp + STACK_BIAS + 128]
stx %o4, [%sp + STACK_BIAS + 136]
ldx [%sp + STACK_BIAS + 136], %fsr
fabsd %f0, %f14
ldd [%sp + STACK_BIAS + 128], %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
ldx [%sp + STACK_BIAS + 144], %fsr
END (__nearbyint)
weak_alias (__nearbyint, nearbyint)
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