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/* Float ceil function, sparc64 version.
Copyright (C) 2012 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>
/* Since changing the rounding mode is extremely expensive, we
* try to round up using a method that is rounding mode
* agnostic.
*
* 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.
* One of two things will happen for non-whole initial values.
* Either the rounding mode will round it up, or it will be
* rounded down. If the value started out whole, it will be
* equal after the addition and subtraction. This means we
* can accurately detect with one test whether we need to add
* another 1.0 to round it up properly.
*
* 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_TWENTYTHREE 0x4b000000 /* 2**23 */
#define ONE_DOT_ZERO 0x3f800000 /* 1.0 */
#define ZERO %f10 /* 0.0 */
#define SIGN_BIT %f12 /* -0.0 */
ENTRY (__ceilf)
sethi %hi(TWO_TWENTYTHREE), %o2
sethi %hi(ONE_DOT_ZERO), %o3
fzeros ZERO
fnegs ZERO, SIGN_BIT
st %o2, [%sp + STACK_BIAS + 128]
fabss %f1, %f14
ld [%sp + STACK_BIAS + 128], %f16
fcmps %fcc3, %f14, %f16
fmovsuge %fcc3, ZERO, %f16
fands %f1, SIGN_BIT, SIGN_BIT
fors %f16, SIGN_BIT, %f16
fadds %f1, %f16, %f5
fsubs %f5, %f16, %f5
fcmps %fcc2, %f5, %f1
st %o3, [%fp + STACK_BIAS + 128]
ld [%fp + STACK_BIAS + 128], %f9
fmovsuge %fcc2, ZERO, %f9
fadds %f5, %f9, %f0
fabss %f0, %f0
retl
fors %f0, SIGN_BIT, %f0
END (__ceilf)
weak_alias (__ceilf, ceilf)
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