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/* Round float to int floating-point values without generating
an inexact exception, sparc64 version.
Copyright (C) 2013-2020 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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <libm-alias-float.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_TWENTYTHREE 0x4b000000 /* 2**23 */
#define ZERO %f10 /* 0.0 */
#define SIGN_BIT %f12 /* -0.0 */
ENTRY (__nearbyintf)
fcmps %fcc3, %f1, %f1 /* Check for sNaN */
stx %fsr, [%sp + STACK_BIAS + 144]
sethi %hi(0xf8003e0), %o5
sethi %hi(TWO_TWENTYTHREE), %o2
ldx [%sp + STACK_BIAS + 144], %o4
or %o5, %lo(0xf8003e0), %o5
fzeros ZERO
andn %o4, %o5, %o4
fnegs ZERO, SIGN_BIT
st %o2, [%sp + STACK_BIAS + 128]
stx %o4, [%sp + STACK_BIAS + 136]
ldx [%sp + STACK_BIAS + 136], %fsr
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, %f0
fabss %f0, %f0
fors %f0, SIGN_BIT, %f0
retl
ldx [%sp + STACK_BIAS + 144], %fsr
END (__nearbyintf)
libm_alias_float (__nearbyint, nearbyint)
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