diff options
Diffstat (limited to 'softfloat/f32_to_i64.c')
-rw-r--r--[-rwxr-xr-x] | softfloat/f32_to_i64.c | 142 |
1 files changed, 96 insertions, 46 deletions
diff --git a/softfloat/f32_to_i64.c b/softfloat/f32_to_i64.c index 522449a..816bc7b 100755..100644 --- a/softfloat/f32_to_i64.c +++ b/softfloat/f32_to_i64.c @@ -1,46 +1,96 @@ -// See LICENSE.SoftFloat for license details. - -
-#include <stdbool.h>
-#include <stdint.h>
-#include "platform.h"
-#include "primitives.h"
-#include "internals.h"
-#include "softfloat.h"
-
-int_fast64_t f32_to_i64( float32_t a, int_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 );
- if ( ! sign ) {
- return INT64_C( 0x7FFFFFFFFFFFFFFF );
- }
- return - INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1;
- }
- if ( exp ) sig |= 0x00800000;
- sig64 = (uint_fast64_t) sig<<40;
- extra = 0;
- if ( shiftCount ) {
- sig64Extra = softfloat_shift64ExtraRightJam( sig64, 0, shiftCount );
- sig64 = sig64Extra.v;
- extra = sig64Extra.extra;
- }
- return softfloat_roundPackToI64( sign, sig64, extra, roundingMode, exact );
-
-}
-
+ +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3e, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the +University of California. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions, and the following disclaimer. + + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions, and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3. Neither the name of the University nor the names of its contributors may + be used to endorse or promote products derived from this software without + specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE +DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=============================================================================*/ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "internals.h" +#include "specialize.h" +#include "softfloat.h" + +int_fast64_t f32_to_i64( 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 shiftDist; +#ifdef SOFTFLOAT_FAST_INT64 + uint_fast64_t sig64, extra; + struct uint64_extra sig64Extra; +#else + uint32_t extSig[3]; +#endif + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uA.f = a; + uiA = uA.ui; + sign = signF32UI( uiA ); + exp = expF32UI( uiA ); + sig = fracF32UI( uiA ); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + shiftDist = 0xBE - exp; + if ( shiftDist < 0 ) { + softfloat_raiseFlags( softfloat_flag_invalid ); + return + (exp == 0xFF) && sig ? i64_fromNaN + : sign ? i64_fromNegOverflow : i64_fromPosOverflow; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( exp ) sig |= 0x00800000; +#ifdef SOFTFLOAT_FAST_INT64 + sig64 = (uint_fast64_t) sig<<40; + extra = 0; + if ( shiftDist ) { + sig64Extra = softfloat_shiftRightJam64Extra( sig64, 0, shiftDist ); + sig64 = sig64Extra.v; + extra = sig64Extra.extra; + } + return softfloat_roundToI64( sign, sig64, extra, roundingMode, exact ); +#else + extSig[indexWord( 3, 2 )] = sig<<8; + extSig[indexWord( 3, 1 )] = 0; + extSig[indexWord( 3, 0 )] = 0; + if ( shiftDist ) softfloat_shiftRightJam96M( extSig, shiftDist, extSig ); + return softfloat_roundMToI64( sign, extSig, roundingMode, exact ); +#endif + +} + |