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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, 2016 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 |
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| 43 | float64_t
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| 44 | softfloat_addMagsF64( uint_fast64_t uiA, uint_fast64_t uiB, bool signZ SOFTFLOAT_STATE_DECL_COMMA )
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| 45 | {
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| 46 | int_fast16_t expA;
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| 47 | uint_fast64_t sigA;
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| 48 | int_fast16_t expB;
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| 49 | uint_fast64_t sigB;
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| 50 | int_fast16_t expDiff;
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| 51 | uint_fast64_t uiZ;
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| 52 | int_fast16_t expZ;
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| 53 | uint_fast64_t sigZ;
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| 54 | union ui64_f64 uZ;
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| 55 |
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| 56 | /*------------------------------------------------------------------------
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| 57 | *------------------------------------------------------------------------*/
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| 58 | expA = expF64UI( uiA );
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| 59 | sigA = fracF64UI( uiA );
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| 60 | expB = expF64UI( uiB );
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| 61 | sigB = fracF64UI( uiB );
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| 62 | /*------------------------------------------------------------------------
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| 63 | *------------------------------------------------------------------------*/
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| 64 | expDiff = expA - expB;
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| 65 | if ( ! expDiff ) {
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| 66 | /*--------------------------------------------------------------------
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| 67 | *--------------------------------------------------------------------*/
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| 68 | if ( ! expA ) {
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| 69 | uiZ = uiA + sigB;
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| 70 | goto uiZ;
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| 71 | }
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| 72 | if ( expA == 0x7FF ) {
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| 73 | if ( sigA | sigB ) goto propagateNaN;
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| 74 | uiZ = uiA;
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| 75 | goto uiZ;
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| 76 | }
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| 77 | expZ = expA;
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| 78 | sigZ = UINT64_C( 0x0020000000000000 ) + sigA + sigB;
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| 79 | sigZ <<= 9;
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| 80 | } else {
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| 81 | /*--------------------------------------------------------------------
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| 82 | *--------------------------------------------------------------------*/
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| 83 | sigA <<= 9;
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| 84 | sigB <<= 9;
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| 85 | if ( expDiff < 0 ) {
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| 86 | if ( expB == 0x7FF ) {
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| 87 | if ( sigB ) goto propagateNaN;
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| 88 | uiZ = packToF64UI( signZ, 0x7FF, 0 );
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| 89 | goto uiZ;
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| 90 | }
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| 91 | expZ = expB;
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| 92 | if ( expA ) {
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| 93 | sigA += UINT64_C( 0x2000000000000000 );
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| 94 | } else {
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| 95 | sigA <<= 1;
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| 96 | }
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| 97 | sigA = softfloat_shiftRightJam64( sigA, -expDiff );
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| 98 | } else {
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| 99 | if ( expA == 0x7FF ) {
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| 100 | if ( sigA ) goto propagateNaN;
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| 101 | uiZ = uiA;
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| 102 | goto uiZ;
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| 103 | }
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| 104 | expZ = expA;
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| 105 | if ( expB ) {
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| 106 | sigB += UINT64_C( 0x2000000000000000 );
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| 107 | } else {
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| 108 | sigB <<= 1;
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| 109 | }
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| 110 | sigB = softfloat_shiftRightJam64( sigB, expDiff );
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| 111 | }
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| 112 | sigZ = UINT64_C( 0x2000000000000000 ) + sigA + sigB;
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| 113 | if ( sigZ < UINT64_C( 0x4000000000000000 ) ) {
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| 114 | --expZ;
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| 115 | sigZ <<= 1;
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| 116 | }
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| 117 | }
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| 118 | return softfloat_roundPackToF64( signZ, expZ, sigZ SOFTFLOAT_STATE_ARG_COMMA );
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| 119 | /*------------------------------------------------------------------------
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| 120 | *------------------------------------------------------------------------*/
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| 121 | propagateNaN:
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| 122 | uiZ = softfloat_propagateNaNF64UI( uiA, uiB SOFTFLOAT_STATE_ARG_COMMA );
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| 123 | uiZ:
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| 124 | uZ.ui = uiZ;
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| 125 | return uZ.f;
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| 126 |
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| 127 | }
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| 128 |
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