mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 19:00:09 +00:00
84 lines
2.6 KiB
ArmAsm
84 lines
2.6 KiB
ArmAsm
/* ceil function, sparc64 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>
|
|
|
|
/* 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_FIFTYTWO 0x43300000 /* 2**52 */
|
|
#define ONE_DOT_ZERO 0x3ff00000 /* 1.0 */
|
|
|
|
#define ZERO %f10 /* 0.0 */
|
|
#define SIGN_BIT %f12 /* -0.0 */
|
|
|
|
ENTRY (__ceil)
|
|
sethi %hi(TWO_FIFTYTWO), %o2
|
|
sethi %hi(ONE_DOT_ZERO), %o3
|
|
fzero ZERO
|
|
|
|
sllx %o2, 32, %o2
|
|
fnegd ZERO, SIGN_BIT
|
|
|
|
sllx %o3, 32, %o3
|
|
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
|
|
faddd %f0, %f16, %f18
|
|
fsubd %f18, %f16, %f18
|
|
fcmpd %fcc2, %f18, %f0
|
|
stx %o3, [%sp + STACK_BIAS + 128]
|
|
|
|
ldd [%sp + STACK_BIAS + 128], %f20
|
|
fmovduge %fcc2, ZERO, %f20
|
|
faddd %f18, %f20, %f0
|
|
fabsd %f0, %f0
|
|
retl
|
|
for %f0, SIGN_BIT, %f0
|
|
END (__ceil)
|
|
weak_alias (__ceil, ceil)
|