1 // SPDX-License-Identifier: BSD-3-Clause 2 3 /*============================================================================ 4 5 This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic 6 Package, Release 3a, by John R. Hauser. 7 8 Copyright 2011, 2012, 2013, 2014 The Regents of the University of California. 9 All rights reserved. 10 11 Redistribution and use in source and binary forms, with or without 12 modification, are permitted provided that the following conditions are met: 13 14 1. Redistributions of source code must retain the above copyright notice, 15 this list of conditions, and the following disclaimer. 16 17 2. Redistributions in binary form must reproduce the above copyright notice, 18 this list of conditions, and the following disclaimer in the documentation 19 and/or other materials provided with the distribution. 20 21 3. Neither the name of the University nor the names of its contributors may 22 be used to endorse or promote products derived from this software without 23 specific prior written permission. 24 25 THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY 26 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 27 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE 28 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY 29 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 30 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 31 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 32 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 34 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 36 =============================================================================*/ 37 38 #include <stdbool.h> 39 #include <stdint.h> 40 #include "platform.h" 41 #include "internals.h" 42 #include "specialize.h" 43 #include "softfloat.h" 44 45 /*---------------------------------------------------------------------------- 46 | Interpreting the unsigned integer formed from concatenating `uiA64' and 47 | `uiA0' as a 128-bit floating-point value, and likewise interpreting the 48 | unsigned integer formed from concatenating `uiB64' and `uiB0' as another 49 | 128-bit floating-point value, and assuming at least on of these floating- 50 | point values is a NaN, returns the bit pattern of the combined NaN result. 51 | If either original floating-point value is a signaling NaN, the invalid 52 | exception is raised. 53 *----------------------------------------------------------------------------*/ 54 struct uint128 softfloat_propagateNaNF128UI(uint_fast64_t uiA64,uint_fast64_t uiA0,uint_fast64_t uiB64,uint_fast64_t uiB0)55 softfloat_propagateNaNF128UI( 56 uint_fast64_t uiA64, 57 uint_fast64_t uiA0, 58 uint_fast64_t uiB64, 59 uint_fast64_t uiB0 60 ) 61 { 62 bool isSigNaNA, isSigNaNB; 63 uint_fast64_t uiNonsigA64, uiNonsigB64, uiMagA64, uiMagB64; 64 struct uint128 uiZ; 65 66 /*------------------------------------------------------------------------ 67 *------------------------------------------------------------------------*/ 68 isSigNaNA = softfloat_isSigNaNF128UI( uiA64, uiA0 ); 69 isSigNaNB = softfloat_isSigNaNF128UI( uiB64, uiB0 ); 70 /*------------------------------------------------------------------------ 71 | Make NaNs non-signaling. 72 *------------------------------------------------------------------------*/ 73 uiNonsigA64 = uiA64 | UINT64_C( 0x0000800000000000 ); 74 uiNonsigB64 = uiB64 | UINT64_C( 0x0000800000000000 ); 75 /*------------------------------------------------------------------------ 76 *------------------------------------------------------------------------*/ 77 if ( isSigNaNA | isSigNaNB ) { 78 softfloat_raiseFlags( softfloat_flag_invalid ); 79 if ( isSigNaNA ) { 80 if ( isSigNaNB ) goto returnLargerMag; 81 if ( isNaNF128UI( uiB64, uiB0 ) ) goto returnB; 82 goto returnA; 83 } else { 84 if ( isNaNF128UI( uiA64, uiA0 ) ) goto returnA; 85 goto returnB; 86 } 87 } 88 returnLargerMag: 89 uiMagA64 = uiNonsigA64 & UINT64_C( 0x7FFFFFFFFFFFFFFF ); 90 uiMagB64 = uiNonsigB64 & UINT64_C( 0x7FFFFFFFFFFFFFFF ); 91 if ( uiMagA64 < uiMagB64 ) goto returnB; 92 if ( uiMagB64 < uiMagA64 ) goto returnA; 93 if ( uiA0 < uiB0 ) goto returnB; 94 if ( uiB0 < uiA0 ) goto returnA; 95 if ( uiNonsigA64 < uiNonsigB64 ) goto returnA; 96 returnB: 97 uiZ.v64 = uiNonsigB64; 98 uiZ.v0 = uiB0; 99 return uiZ; 100 returnA: 101 uiZ.v64 = uiNonsigA64; 102 uiZ.v0 = uiA0; 103 return uiZ; 104 105 } 106 107