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Diffstat (limited to 'source/f128M_to_i64.c')
-rw-r--r-- | source/f128M_to_i64.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/source/f128M_to_i64.c b/source/f128M_to_i64.c new file mode 100644 index 0000000..947948c --- /dev/null +++ b/source/f128M_to_i64.c @@ -0,0 +1,95 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014 The Regents of the University of California +(Regents). All Rights Reserved. Redistribution and use in source and binary +forms, with or without modification, are permitted provided that the following +conditions are met: + +Redistributions of source code must retain the above copyright notice, +this list of conditions, and the following two paragraphs of disclaimer. +Redistributions in binary form must reproduce the above copyright notice, +this list of conditions, and the following two paragraphs of disclaimer in the +documentation and/or other materials provided with the distribution. Neither +the name of the Regents nor the names of its contributors may be used to +endorse or promote products derived from this software without specific prior +written permission. + +IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, +SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING +OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS +BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED +TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED +HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE +MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + +=============================================================================*/ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "internals.h" +#include "softfloat.h" + +#ifdef SOFTFLOAT_FAST_INT64 + +int_fast64_t + f128M_to_i64( const float128_t *aPtr, uint_fast8_t roundingMode, bool exact ) +{ + + return f128_to_i64( *aPtr, roundingMode, exact ); + +} + +#else + +int_fast64_t + f128M_to_i64( const float128_t *aPtr, uint_fast8_t roundingMode, bool exact ) +{ + const uint32_t *aWPtr; + uint32_t uiA96; + int32_t exp; + bool sign; + uint32_t sig96; + int32_t shiftCount; + uint32_t sig[4]; + + aWPtr = (const uint32_t *) aPtr; + uiA96 = aWPtr[indexWordHi( 4 )]; + exp = expF128UI96( uiA96 ); + sign = signF128UI96( uiA96 ); + sig96 = fracF128UI96( uiA96 ); + shiftCount = 0x404F - exp; + if ( shiftCount < 17 ) { + softfloat_raiseFlags( softfloat_flag_invalid ); + return + ! sign + || ((exp == 0x7FFF) + && (sig96 + || ( aWPtr[indexWord( 4, 2 )] + | aWPtr[indexWord( 4, 1 )] + | aWPtr[indexWord( 4, 0 )] + ))) + ? INT64_C( 0x7FFFFFFFFFFFFFFF ) + : -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1; + } + if ( exp ) sig96 |= 0x00010000; + sig[indexWord( 4, 3 )] = sig96; + sig[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )]; + sig[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )]; + sig[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )]; + softfloat_shiftRightJam128M( sig, shiftCount, sig ); + return + softfloat_roundPackMToI64( + sign, sig + indexMultiwordLo( 4, 3 ), roundingMode, exact ); + +} + +#endif + |