| |
| /*============================================================================ |
| |
| 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 |
| |
| uint_fast64_t f32_to_ui64( float32_t a, uint_fast8_t roundingMode, bool exact ) |
| { |
| union ui32_f32 uA; |
| uint_fast32_t uiA; |
| bool sign; |
| int_fast16_t exp; |
| uint_fast32_t sig; |
| int_fast16_t shiftCount; |
| uint_fast64_t sig64, extra; |
| struct uint64_extra sig64Extra; |
| |
| uA.f = a; |
| uiA = uA.ui; |
| sign = signF32UI( uiA ); |
| exp = expF32UI( uiA ); |
| sig = fracF32UI( uiA ); |
| shiftCount = 0xBE - exp; |
| if ( shiftCount < 0 ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return UINT64_C( 0xFFFFFFFFFFFFFFFF ); |
| } |
| if ( exp ) sig |= 0x00800000; |
| sig64 = (uint_fast64_t) sig<<40; |
| extra = 0; |
| if ( shiftCount ) { |
| sig64Extra = softfloat_shiftRightJam64Extra( sig64, 0, shiftCount ); |
| sig64 = sig64Extra.v; |
| extra = sig64Extra.extra; |
| } |
| return |
| softfloat_roundPackToUI64( sign, sig64, extra, roundingMode, exact ); |
| |
| } |
| |
| #else |
| |
| uint_fast64_t f32_to_ui64( float32_t a, uint_fast8_t roundingMode, bool exact ) |
| { |
| union ui32_f32 uA; |
| uint32_t uiA; |
| bool sign; |
| int_fast16_t exp; |
| uint32_t sig; |
| int_fast16_t shiftCount; |
| uint32_t extSig[3]; |
| |
| uA.f = a; |
| uiA = uA.ui; |
| sign = signF32UI( uiA ); |
| exp = expF32UI( uiA ); |
| sig = fracF32UI( uiA ); |
| shiftCount = 0xBE - exp; |
| if ( shiftCount < 0 ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return UINT64_C( 0xFFFFFFFFFFFFFFFF ); |
| } |
| if ( exp ) sig |= 0x00800000; |
| extSig[indexWord( 3, 2 )] = sig<<8; |
| extSig[indexWord( 3, 1 )] = 0; |
| extSig[indexWord( 3, 0 )] = 0; |
| if ( shiftCount ) softfloat_shiftRightJam96M( extSig, shiftCount, extSig ); |
| return softfloat_roundPackMToUI64( sign, extSig, roundingMode, exact ); |
| |
| } |
| |
| #endif |
| |