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100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014 The Regents of the University of California
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(Regents). All Rights Reserved. Redistribution and use in source and binary
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forms, with or without modification, are permitted provided that the following
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conditions are met:
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Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following two paragraphs of disclaimer.
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Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following two paragraphs of disclaimer in the
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documentation and/or other materials provided with the distribution. Neither
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the name of the Regents nor the names of its contributors may be used to
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endorse or promote products derived from this software without specific prior
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written permission.
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IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
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SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
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OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
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BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
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HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
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MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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=============================================================================*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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#ifdef SOFTFLOAT_FAST_INT64
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float64_t f128M_to_f64( const float128_t *aPtr )
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{
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return f128_to_f64( *aPtr );
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}
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#else
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float64_t f128M_to_f64( const float128_t *aPtr )
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{
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const uint32_t *aWPtr;
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uint32_t uiA96;
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bool sign;
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int32_t exp;
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uint64_t sig64;
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struct commonNaN commonNaN;
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uint64_t uiZ;
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uint32_t sig32;
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union ui64_f64 uZ;
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aWPtr = (const uint32_t *) aPtr;
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uiA96 = aWPtr[indexWordHi( 4 )];
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sign = signF128UI96( uiA96 );
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exp = expF128UI96( uiA96 );
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sig64 = (uint64_t) fracF128UI96( uiA96 )<<32 | aWPtr[indexWord( 4, 2 )];
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if ( exp == 0x7FFF ) {
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if ( sig64 || aWPtr[indexWord( 4, 1 )] | aWPtr[indexWord( 4, 0 )] ) {
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softfloat_f128MToCommonNaN( aWPtr, &commonNaN );
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uiZ = softfloat_commonNaNToF64UI( &commonNaN );
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} else {
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uiZ = packToF64UI( sign, 0x7FF, 0 );
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}
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goto uiZ;
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}
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sig32 = aWPtr[indexWord( 4, 1 )];
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sig64 = sig64<<14 | sig32>>18;
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if ( (sig32 & 0x0003FFFF) || aWPtr[indexWord( 4, 0 )] ) sig64 |= 1;
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if ( ! exp && ! sig64 ) {
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uiZ = packToF64UI( sign, 0, 0 );
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goto uiZ;
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}
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exp -= 0x3C01;
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if ( sizeof (int_fast16_t) < sizeof (int32_t) ) {
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if ( exp < -0x1000 ) exp = -0x1000;
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}
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return
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softfloat_roundPackToF64(
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sign, exp, sig64 | UINT64_C( 0x4000000000000000 ) );
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uiZ:
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uZ.ui = uiZ;
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return uZ.f;
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}
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#endif
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