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Diffstat (limited to 'source/f128_to_i64_r_minMag.c')
| -rw-r--r-- | source/f128_to_i64_r_minMag.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/source/f128_to_i64_r_minMag.c b/source/f128_to_i64_r_minMag.c new file mode 100644 index 0000000..2a0b62c --- /dev/null +++ b/source/f128_to_i64_r_minMag.c @@ -0,0 +1,98 @@ + +/*============================================================================ + +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" + +int_fast64_t f128_to_i64_r_minMag( float128_t a, bool exact ) +{ + union ui128_f128 uA; + uint_fast64_t uiA64, uiA0; + bool sign; + int_fast32_t exp; + uint_fast64_t sig64, sig0; + int_fast32_t shiftCount; + int_fast16_t negShiftCount; + int_fast64_t absZ; + + uA.f = a; + uiA64 = uA.ui.v64; + uiA0 = uA.ui.v0; + sign = signF128UI64( uiA64 ); + exp = expF128UI64( uiA64 ); + sig64 = fracF128UI64( uiA64 ); + sig0 = uiA0; + shiftCount = 0x402F - exp; + if ( shiftCount < 0 ) { + if ( shiftCount < -14 ) { + if ( + (uiA64 == UINT64_C( 0xC03E000000000000 )) + && (sig0 < UINT64_C( 0x0002000000000000 )) + ) { + if ( exact && sig0 ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + } else { + softfloat_raiseFlags( softfloat_flag_invalid ); + if ( ! sign || ((exp == 0x7FFF) && (sig64 | sig0)) ) { + return UINT64_C( 0x7FFFFFFFFFFFFFFF ); + } + } + return -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1; + } + sig64 |= UINT64_C( 0x0001000000000000 ); + negShiftCount = -shiftCount; + absZ = sig64<<negShiftCount | sig0>>(shiftCount & 63); + if ( exact && (uint64_t) (sig0<<negShiftCount) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + } else { + if ( 49 <= shiftCount ) { + if ( exact && (exp | sig64 | sig0) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + return 0; + } + sig64 |= UINT64_C( 0x0001000000000000 ); + absZ = sig64>>shiftCount; + if ( exact && (sig0 || (absZ<<shiftCount != sig64)) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + } + return sign ? -absZ : absZ; + +} + |