1 2/*============================================================================ 3 4This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic 5Package, Release 3e, by John R. Hauser. 6 7Copyright 2011, 2012, 2013, 2014, 2015 The Regents of the University of 8California. All rights reserved. 9 10Redistribution and use in source and binary forms, with or without 11modification, are permitted provided that the following conditions are met: 12 13 1. Redistributions of source code must retain the above copyright notice, 14 this list of conditions, and the following disclaimer. 15 16 2. Redistributions in binary form must reproduce the above copyright notice, 17 this list of conditions, and the following disclaimer in the documentation 18 and/or other materials provided with the distribution. 19 20 3. Neither the name of the University nor the names of its contributors may 21 be used to endorse or promote products derived from this software without 22 specific prior written permission. 23 24THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY 25EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 26WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE 27DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY 28DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 29(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 30LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 31ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 35=============================================================================*/ 36 37#include <stdbool.h> 38#include <stdint.h> 39#include "platform.h" 40#include "internals.h" 41#include "specialize.h" 42#include "softfloat.h" 43 44#ifdef SOFTFLOAT_FAST_INT64 45 46float32_t f128M_to_f32( const float128_t *aPtr ) 47{ 48 49 return f128_to_f32( *aPtr ); 50 51} 52 53#else 54 55float32_t f128M_to_f32( const float128_t *aPtr ) 56{ 57 const uint32_t *aWPtr; 58 uint32_t uiA96; 59 bool sign; 60 int32_t exp; 61 uint64_t frac64; 62 struct commonNaN commonNaN; 63 uint32_t uiZ, frac32; 64 union ui32_f32 uZ; 65 66 /*------------------------------------------------------------------------ 67 *------------------------------------------------------------------------*/ 68 aWPtr = (const uint32_t *) aPtr; 69 uiA96 = aWPtr[indexWordHi( 4 )]; 70 sign = signF128UI96( uiA96 ); 71 exp = expF128UI96( uiA96 ); 72 frac64 = 73 (uint64_t) fracF128UI96( uiA96 )<<32 | aWPtr[indexWord( 4, 2 )] 74 | ((aWPtr[indexWord( 4, 1 )] | aWPtr[indexWord( 4, 0 )]) != 0); 75 /*------------------------------------------------------------------------ 76 *------------------------------------------------------------------------*/ 77 if ( exp == 0x7FFF ) { 78 if ( frac64 ) { 79 softfloat_f128MToCommonNaN( aWPtr, &commonNaN ); 80 uiZ = softfloat_commonNaNToF32UI( &commonNaN ); 81 } else { 82 uiZ = packToF32UI( sign, 0xFF, 0 ); 83 } 84 goto uiZ; 85 } 86 /*------------------------------------------------------------------------ 87 *------------------------------------------------------------------------*/ 88 frac32 = softfloat_shortShiftRightJam64( frac64, 18 ); 89 if ( ! (exp | frac32) ) { 90 uiZ = packToF32UI( sign, 0, 0 ); 91 goto uiZ; 92 } 93 /*------------------------------------------------------------------------ 94 *------------------------------------------------------------------------*/ 95 exp -= 0x3F81; 96 if ( sizeof (int_fast16_t) < sizeof (int32_t) ) { 97 if ( exp < -0x1000 ) exp = -0x1000; 98 } 99 return softfloat_roundPackToF32( sign, exp, frac32 | 0x40000000 ); 100 /*------------------------------------------------------------------------ 101 *------------------------------------------------------------------------*/ 102 uiZ: 103 uZ.ui = uiZ; 104 return uZ.f; 105 106} 107 108#endif 109 110