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| 2 | /*============================================================================
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| 3 |
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| 4 | This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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| 5 | Package, Release 3e, by John R. Hauser.
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| 6 |
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| 7 | Copyright 2011, 2012, 2013, 2014, 2015 The Regents of the University of
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| 8 | California. All rights reserved.
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| 9 |
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| 10 | Redistribution and use in source and binary forms, with or without
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| 11 | modification, are permitted provided that the following conditions are met:
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| 12 |
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| 13 | 1. Redistributions of source code must retain the above copyright notice,
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| 14 | this list of conditions, and the following disclaimer.
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| 15 |
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| 16 | 2. Redistributions in binary form must reproduce the above copyright notice,
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| 17 | this list of conditions, and the following disclaimer in the documentation
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| 18 | and/or other materials provided with the distribution.
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| 19 |
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| 20 | 3. Neither the name of the University nor the names of its contributors may
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| 21 | be used to endorse or promote products derived from this software without
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| 22 | specific prior written permission.
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| 23 |
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| 24 | THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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| 25 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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| 26 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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| 27 | DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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| 28 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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| 29 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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| 30 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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| 31 | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 32 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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| 33 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 34 |
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| 35 | =============================================================================*/
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| 36 |
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| 37 | #include <stdbool.h>
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| 38 | #include <stdint.h>
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| 39 | #include "platform.h"
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| 40 | #include "internals.h"
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| 41 | #include "specialize.h"
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| 42 | #include "softfloat.h"
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| 43 |
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| 44 | #ifdef SOFTFLOAT_FAST_INT64
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| 45 |
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| 46 | float16_t extF80M_to_f16( const extFloat80_t *aPtr SOFTFLOAT_STATE_DECL_COMMA )
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| 47 | {
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| 48 |
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| 49 | return extF80_to_f16( *aPtr SOFTFLOAT_STATE_ARG_COMMA );
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| 50 |
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| 51 | }
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| 52 |
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| 53 | #else
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| 54 |
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| 55 | float16_t extF80M_to_f16( const extFloat80_t *aPtr SOFTFLOAT_STATE_DECL_COMMA )
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| 56 | {
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| 57 | const struct extFloat80M *aSPtr;
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| 58 | uint_fast16_t uiA64;
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| 59 | bool sign;
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| 60 | int32_t exp;
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| 61 | uint64_t sig;
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| 62 | struct commonNaN commonNaN;
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| 63 | uint16_t uiZ, sig16;
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| 64 | union ui16_f16 uZ;
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| 65 |
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| 66 | /*------------------------------------------------------------------------
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| 67 | *------------------------------------------------------------------------*/
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| 68 | aSPtr = (const struct extFloat80M *) aPtr;
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| 69 | /*------------------------------------------------------------------------
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| 70 | *------------------------------------------------------------------------*/
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| 71 | uiA64 = aSPtr->signExp;
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| 72 | sign = signExtF80UI64( uiA64 );
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| 73 | exp = expExtF80UI64( uiA64 );
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| 74 | sig = aSPtr->signif;
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| 75 | /*------------------------------------------------------------------------
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| 76 | *------------------------------------------------------------------------*/
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| 77 | if ( exp == 0x7FFF ) {
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| 78 | if ( sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) {
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| 79 | softfloat_extF80MToCommonNaN( aSPtr, &commonNaN SOFTFLOAT_STATE_ARG_COMMA );
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| 80 | uiZ = softfloat_commonNaNToF16UI( &commonNaN );
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| 81 | } else {
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| 82 | uiZ = packToF16UI( sign, 0x1F, 0 );
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| 83 | }
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| 84 | goto uiZ;
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| 85 | }
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| 86 | /*------------------------------------------------------------------------
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| 87 | *------------------------------------------------------------------------*/
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| 88 | if ( ! (sig & UINT64_C( 0x8000000000000000 )) ) {
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| 89 | if ( ! sig ) {
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| 90 | uiZ = packToF16UI( sign, 0, 0 );
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| 91 | goto uiZ;
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| 92 | }
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| 93 | exp += softfloat_normExtF80SigM( &sig );
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| 94 | }
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| 95 | /*------------------------------------------------------------------------
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| 96 | *------------------------------------------------------------------------*/
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| 97 | sig16 = softfloat_shortShiftRightJam64( sig, 49 );
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| 98 | exp -= 0x3FF1;
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| 99 | if ( sizeof (int_fast16_t) < sizeof (int32_t) ) {
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| 100 | if ( exp < -0x40 ) exp = -0x40;
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| 101 | }
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| 102 | return softfloat_roundPackToF16( sign, exp, sig16 SOFTFLOAT_STATE_ARG_COMMA );
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| 103 | /*------------------------------------------------------------------------
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| 104 | *------------------------------------------------------------------------*/
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| 105 | uiZ:
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| 106 | uZ.ui = uiZ;
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| 107 | return uZ.f;
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| 108 |
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| 109 | }
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| 110 |
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| 111 | #endif
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| 112 |
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