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Based on 2 normalized pattern(s): it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 11 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000434.249870634@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* IEEE754 floating point arithmetic
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* single precision
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*/
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/*
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* MIPS floating point support
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* Copyright (C) 1994-2000 Algorithmics Ltd.
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* Copyright (C) 2017 Imagination Technologies, Ltd.
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* Author: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
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*/
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#include "ieee754sp.h"
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union ieee754sp ieee754sp_rint(union ieee754sp x)
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{
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union ieee754sp ret;
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u32 residue;
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int sticky;
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int round;
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int odd;
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COMPXDP; /* <-- DP needed for 64-bit mantissa tmp */
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ieee754_clearcx();
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EXPLODEXSP;
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FLUSHXSP;
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if (xc == IEEE754_CLASS_SNAN)
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return ieee754sp_nanxcpt(x);
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if ((xc == IEEE754_CLASS_QNAN) ||
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(xc == IEEE754_CLASS_INF) ||
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(xc == IEEE754_CLASS_ZERO))
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return x;
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if (xe >= SP_FBITS)
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return x;
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if (xe < -1) {
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residue = xm;
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round = 0;
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sticky = residue != 0;
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xm = 0;
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} else {
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residue = xm << (xe + 1);
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residue <<= 31 - SP_FBITS;
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round = (residue >> 31) != 0;
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sticky = (residue << 1) != 0;
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xm >>= SP_FBITS - xe;
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}
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odd = (xm & 0x1) != 0x0;
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switch (ieee754_csr.rm) {
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case FPU_CSR_RN: /* toward nearest */
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if (round && (sticky || odd))
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xm++;
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break;
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case FPU_CSR_RZ: /* toward zero */
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break;
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case FPU_CSR_RU: /* toward +infinity */
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if ((round || sticky) && !xs)
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xm++;
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break;
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case FPU_CSR_RD: /* toward -infinity */
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if ((round || sticky) && xs)
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xm++;
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break;
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}
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if (round || sticky)
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ieee754_setcx(IEEE754_INEXACT);
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ret = ieee754sp_flong(xm);
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SPSIGN(ret) = xs;
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return ret;
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}
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