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64 lines
2.1 KiB
ArmAsm
64 lines
2.1 KiB
ArmAsm
/* Round float to int floating-point values without generating
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an inexact exception, sparc64 version.
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Copyright (C) 2013-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David S. Miller <davem@davemloft.net>, 2013.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* We pop constants into the FPU registers using the incoming
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argument stack slots, since this avoid having to use any PIC
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references. We also thus avoid having to allocate a register
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window.
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VIS instructions are used to facilitate the formation of
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easier constants, and the propagation of the sign bit. */
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#define TWO_FIFTYTWO 0x43300000 /* 2**52 */
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#define ZERO %f10 /* 0.0 */
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#define SIGN_BIT %f12 /* -0.0 */
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ENTRY (__nearbyint)
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stx %fsr, [%sp + STACK_BIAS + 144]
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sethi %hi(TWO_FIFTYTWO), %o2
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sllx %o2, 32, %o2
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ldx [%sp + STACK_BIAS + 144], %o4
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sethi %hi(0xf8003e0), %o5
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fzero ZERO
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or %o5, %lo(0xf8003e0), %o5
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fnegd ZERO, SIGN_BIT
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andn %o4, %o5, %o4
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stx %o2, [%sp + STACK_BIAS + 128]
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stx %o4, [%sp + STACK_BIAS + 136]
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ldx [%sp + STACK_BIAS + 136], %fsr
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fabsd %f0, %f14
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ldd [%sp + STACK_BIAS + 128], %f16
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fcmpd %fcc3, %f14, %f16
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fmovduge %fcc3, ZERO, %f16
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fand %f0, SIGN_BIT, SIGN_BIT
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for %f16, SIGN_BIT, %f16
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faddd %f0, %f16, %f6
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fsubd %f6, %f16, %f0
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fabsd %f0, %f0
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for %f0, SIGN_BIT, %f0
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retl
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ldx [%sp + STACK_BIAS + 144], %fsr
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END (__nearbyint)
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weak_alias (__nearbyint, nearbyint)
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