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/* floor function, sparc64 vis2 version.
Copyright (C) 2012-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David S. Miller <davem@davemloft.net>, 2012.
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>
/* 'siam' (Set Interval Arithmetic Mode) is used to quickly override
the rounding mode during this routine.
We add then subtract (or subtract than add if the initial
value was negative) 2**23 to the value, then subtract it
back out.
This will clear out the fractional portion of the value and,
with suitable 'siam' initiated rouding mode settings, round
the final result in the proper direction. */
#define TWO_FIFTYTWO 0x43300000 /* 2**52 */
#define ZERO %f10 /* 0.0 */
#define SIGN_BIT %f12 /* -0.0 */
ENTRY (__floor_vis2)
sethi %hi(TWO_FIFTYTWO), %o2
fzero ZERO
sllx %o2, 32, %o2
fnegd ZERO, SIGN_BIT
stx %o2, [%sp + STACK_BIAS + 128]
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
siam (1 << 2) | 3
faddd %f0, %f16, %f18
siam (1 << 2) | 0
fsubd %f18, %f16, %f18
siam (0 << 2)
retl
for %f18, SIGN_BIT, %f0
END (__floor_vis2)
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