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Diffstat (limited to 'source/f64_to_i32_r_minMag.c')
-rw-r--r-- | source/f64_to_i32_r_minMag.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/source/f64_to_i32_r_minMag.c b/source/f64_to_i32_r_minMag.c new file mode 100644 index 0000000..7d44aee --- /dev/null +++ b/source/f64_to_i32_r_minMag.c @@ -0,0 +1,83 @@ + +/*============================================================================ + +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_fast32_t f64_to_i32_r_minMag( float64_t a, bool exact ) +{ + union ui64_f64 uA; + uint_fast64_t uiA; + int_fast16_t exp; + uint_fast64_t sig; + int_fast16_t shiftCount; + bool sign; + int_fast32_t absZ; + + uA.f = a; + uiA = uA.ui; + exp = expF64UI( uiA ); + sig = fracF64UI( uiA ); + shiftCount = 0x433 - exp; + if ( 53 <= shiftCount ) { + if ( exact && (exp | sig) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + return 0; + } + sign = signF64UI( uiA ); + if ( shiftCount < 22 ) { + if ( + sign && (exp == 0x41E) && (sig < UINT64_C( 0x0000000000200000 )) + ) { + if ( exact && sig ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + } else { + softfloat_raiseFlags( softfloat_flag_invalid ); + if ( ! sign || ((exp == 0x7FF) && sig) ) return 0x7FFFFFFF; + } + return -0x7FFFFFFF - 1; + } + sig |= UINT64_C( 0x0010000000000000 ); + absZ = sig>>shiftCount; + if ( exact && ((uint_fast64_t) (uint_fast32_t) absZ<<shiftCount != sig) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + return sign ? -absZ : absZ; + +} + |