forked from Minki/linux
9d5a634946
Based on 1 normalized pattern(s): this program is free software you can distribute 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 if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 33 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531081038.563233189@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
75 lines
1.4 KiB
C
75 lines
1.4 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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*/
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#include "ieee754sp.h"
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#include "ieee754dp.h"
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static inline union ieee754sp ieee754sp_nan_fdp(int xs, u64 xm)
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{
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return buildsp(xs, SP_EMAX + 1 + SP_EBIAS,
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xm >> (DP_FBITS - SP_FBITS));
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}
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union ieee754sp ieee754sp_fdp(union ieee754dp x)
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{
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union ieee754sp y;
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u32 rm;
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COMPXDP;
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COMPYSP;
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EXPLODEXDP;
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ieee754_clearcx();
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FLUSHXDP;
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switch (xc) {
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case IEEE754_CLASS_SNAN:
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x = ieee754dp_nanxcpt(x);
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EXPLODEXDP;
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/* fall through */
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case IEEE754_CLASS_QNAN:
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y = ieee754sp_nan_fdp(xs, xm);
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if (!ieee754_csr.nan2008) {
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EXPLODEYSP;
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if (!ieee754_class_nan(yc))
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y = ieee754sp_indef();
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}
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return y;
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case IEEE754_CLASS_INF:
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return ieee754sp_inf(xs);
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case IEEE754_CLASS_ZERO:
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return ieee754sp_zero(xs);
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case IEEE754_CLASS_DNORM:
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/* can't possibly be sp representable */
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ieee754_setcx(IEEE754_UNDERFLOW);
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ieee754_setcx(IEEE754_INEXACT);
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if ((ieee754_csr.rm == FPU_CSR_RU && !xs) ||
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(ieee754_csr.rm == FPU_CSR_RD && xs))
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return ieee754sp_mind(xs);
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return ieee754sp_zero(xs);
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case IEEE754_CLASS_NORM:
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break;
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}
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/*
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* Convert from DP_FBITS to SP_FBITS+3 with sticky right shift.
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*/
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rm = (xm >> (DP_FBITS - (SP_FBITS + 3))) |
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((xm << (64 - (DP_FBITS - (SP_FBITS + 3)))) != 0);
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return ieee754sp_format(xs, xe, rm);
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}
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