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authorAndrew Waterman <andrew@sifive.com>2018-07-11 01:16:28 -0700
committerAndrew Waterman <andrew@sifive.com>2018-07-11 01:16:28 -0700
commit5cd8d2b93fad2011fdf8f49a263d77697af35b32 (patch)
treef6fb9cb6d3bef2aa5c9903511b92e5a6e99e9519 /softfloat/f16_to_ui64_r_minMag.c
parent8e69141749065ff957383d2112768f95a33429b6 (diff)
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Upgrade to SoftFloat 3e
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+
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3e, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
+California. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions, and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions, and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ 3. Neither the name of the University nor the names of its contributors may
+ be used to endorse or promote products derived from this software without
+ specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
+DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=============================================================================*/
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+uint_fast64_t f16_to_ui64_r_minMag( float16_t a, bool exact )
+{
+ union ui16_f16 uA;
+ uint_fast16_t uiA;
+ int_fast8_t exp;
+ uint_fast16_t frac;
+ int_fast8_t shiftDist;
+ bool sign;
+ uint_fast32_t alignedSig;
+
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ uA.f = a;
+ uiA = uA.ui;
+ exp = expF16UI( uiA );
+ frac = fracF16UI( uiA );
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ shiftDist = exp - 0x0F;
+ if ( shiftDist < 0 ) {
+ if ( exact && (exp | frac) ) {
+ softfloat_raiseFlags( softfloat_flag_inexact );
+ }
+ return 0;
+ }
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ sign = signF16UI( uiA );
+ if ( sign || (exp == 0x1F) ) {
+ softfloat_raiseFlags( softfloat_flag_invalid );
+ return
+ (exp == 0x1F) && frac ? ui64_fromNaN
+ : sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
+ }
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ alignedSig = (uint_fast32_t) (frac | 0x0400)<<shiftDist;
+ if ( exact && (alignedSig & 0x3FF) ) {
+ softfloat_raiseFlags( softfloat_flag_inexact );
+ }
+ return alignedSig>>10;
+
+}
+