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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 The Regents of the University of California.
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| 8 | 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 <stdint.h>
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| 38 | #include "platform.h"
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| 39 | #include "internals.h"
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| 40 | #include "softfloat_types.h"
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| 41 |
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| 42 | int
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| 43 | softfloat_compareNonnormExtF80M(
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| 44 | const struct extFloat80M *aSPtr, const struct extFloat80M *bSPtr )
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| 45 | {
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| 46 | uint_fast16_t uiA64, uiB64;
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| 47 | uint64_t sigA;
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| 48 | bool signB;
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| 49 | uint64_t sigB;
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| 50 | int32_t expA, expB;
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| 51 |
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| 52 | /*------------------------------------------------------------------------
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| 53 | *------------------------------------------------------------------------*/
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| 54 | uiA64 = aSPtr->signExp;
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| 55 | uiB64 = bSPtr->signExp;
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| 56 | sigA = aSPtr->signif;
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| 57 | signB = signExtF80UI64( uiB64 );
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| 58 | sigB = bSPtr->signif;
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| 59 | /*------------------------------------------------------------------------
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| 60 | *------------------------------------------------------------------------*/
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| 61 | if ( (uiA64 ^ uiB64) & 0x8000 ) {
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| 62 | if ( ! (sigA | sigB) ) return 0;
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| 63 | goto resultFromSignB;
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| 64 | }
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| 65 | /*------------------------------------------------------------------------
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| 66 | *------------------------------------------------------------------------*/
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| 67 | expA = expExtF80UI64( uiA64 );
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| 68 | expB = expExtF80UI64( uiB64 );
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| 69 | if ( expA == 0x7FFF ) {
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| 70 | if (expB == 0x7FFF) return 0;
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| 71 | signB = ! signB;
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| 72 | goto resultFromSignB;
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| 73 | }
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| 74 | if ( expB == 0x7FFF ) {
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| 75 | goto resultFromSignB;
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| 76 | }
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| 77 | /*------------------------------------------------------------------------
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| 78 | *------------------------------------------------------------------------*/
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| 79 | if ( ! expA ) expA = 1;
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| 80 | if ( ! (sigA & UINT64_C( 0x8000000000000000 )) ) {
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| 81 | if ( sigA ) {
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| 82 | expA += softfloat_normExtF80SigM( &sigA );
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| 83 | } else {
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| 84 | expA = -128;
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| 85 | }
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| 86 | }
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| 87 | if ( ! expB ) expB = 1;
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| 88 | if ( ! (sigB & UINT64_C( 0x8000000000000000 )) ) {
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| 89 | if ( sigB ) {
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| 90 | expB += softfloat_normExtF80SigM( &sigB );
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| 91 | } else {
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| 92 | expB = -128;
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| 93 | }
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| 94 | }
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| 95 | /*------------------------------------------------------------------------
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| 96 | *------------------------------------------------------------------------*/
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| 97 | if ( signB ) {
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| 98 | if ( expA < expB ) return 1;
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| 99 | if ( (expB < expA) || (sigB < sigA) ) return -1;
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| 100 | } else {
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| 101 | if ( expB < expA ) return 1;
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| 102 | if ( (expA < expB) || (sigA < sigB) ) return -1;
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| 103 | }
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| 104 | return (sigA != sigB);
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| 105 | /*------------------------------------------------------------------------
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| 106 | *------------------------------------------------------------------------*/
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| 107 | resultFromSignB:
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| 108 | return signB ? 1 : -1;
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| 109 |
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| 110 | }
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| 111 |
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