| 1 |
|
|---|
| 2 | /*============================================================================
|
|---|
| 3 |
|
|---|
| 4 | This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
|
|---|
| 5 | Package, Release 3e, by John R. Hauser.
|
|---|
| 6 |
|
|---|
| 7 | Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
|
|---|
| 8 | California. All rights reserved.
|
|---|
| 9 |
|
|---|
| 10 | Redistribution and use in source and binary forms, with or without
|
|---|
| 11 | modification, are permitted provided that the following conditions are met:
|
|---|
| 12 |
|
|---|
| 13 | 1. Redistributions of source code must retain the above copyright notice,
|
|---|
| 14 | this list of conditions, and the following disclaimer.
|
|---|
| 15 |
|
|---|
| 16 | 2. Redistributions in binary form must reproduce the above copyright notice,
|
|---|
| 17 | this list of conditions, and the following disclaimer in the documentation
|
|---|
| 18 | and/or other materials provided with the distribution.
|
|---|
| 19 |
|
|---|
| 20 | 3. Neither the name of the University nor the names of its contributors may
|
|---|
| 21 | be used to endorse or promote products derived from this software without
|
|---|
| 22 | specific prior written permission.
|
|---|
| 23 |
|
|---|
| 24 | THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
|
|---|
| 25 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|---|
| 26 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
|
|---|
| 27 | DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
|
|---|
| 28 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|---|
| 29 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|---|
| 30 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|---|
| 31 | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 32 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|---|
| 33 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 34 |
|
|---|
| 35 | =============================================================================*/
|
|---|
| 36 |
|
|---|
| 37 | #include <stdbool.h>
|
|---|
| 38 | #include <stdint.h>
|
|---|
| 39 | #include "platform.h"
|
|---|
| 40 | #include "internals.h"
|
|---|
| 41 | #include "specialize.h"
|
|---|
| 42 | #include "softfloat.h"
|
|---|
| 43 |
|
|---|
| 44 | int_fast32_t extF80_to_i32_r_minMag( extFloat80_t a, bool exact SOFTFLOAT_STATE_DECL_COMMA )
|
|---|
| 45 | {
|
|---|
| 46 | union { struct extFloat80M s; extFloat80_t f; } uA;
|
|---|
| 47 | uint_fast16_t uiA64;
|
|---|
| 48 | int_fast32_t exp;
|
|---|
| 49 | uint_fast64_t sig;
|
|---|
| 50 | int_fast32_t shiftDist;
|
|---|
| 51 | bool sign;
|
|---|
| 52 | int_fast32_t absZ;
|
|---|
| 53 |
|
|---|
| 54 | /*------------------------------------------------------------------------
|
|---|
| 55 | *------------------------------------------------------------------------*/
|
|---|
| 56 | uA.f = a;
|
|---|
| 57 | uiA64 = uA.s.signExp;
|
|---|
| 58 | exp = expExtF80UI64( uiA64 );
|
|---|
| 59 | sig = uA.s.signif;
|
|---|
| 60 | /*------------------------------------------------------------------------
|
|---|
| 61 | *------------------------------------------------------------------------*/
|
|---|
| 62 | shiftDist = 0x403E - exp;
|
|---|
| 63 | if ( 64 <= shiftDist ) {
|
|---|
| 64 | if ( exact && (exp | sig) ) {
|
|---|
| 65 | softfloat_exceptionFlags |= softfloat_flag_inexact;
|
|---|
| 66 | }
|
|---|
| 67 | return 0;
|
|---|
| 68 | }
|
|---|
| 69 | /*------------------------------------------------------------------------
|
|---|
| 70 | *------------------------------------------------------------------------*/
|
|---|
| 71 | sign = signExtF80UI64( uiA64 );
|
|---|
| 72 | if ( shiftDist < 33 ) {
|
|---|
| 73 | if (
|
|---|
| 74 | (uiA64 == packToExtF80UI64( 1, 0x401E ))
|
|---|
| 75 | && (sig < UINT64_C( 0x8000000100000000 ))
|
|---|
| 76 | ) {
|
|---|
| 77 | if ( exact && (sig & UINT64_C( 0x00000000FFFFFFFF )) ) {
|
|---|
| 78 | softfloat_exceptionFlags |= softfloat_flag_inexact;
|
|---|
| 79 | }
|
|---|
| 80 | return -0x7FFFFFFF - 1;
|
|---|
| 81 | }
|
|---|
| 82 | softfloat_raiseFlags( softfloat_flag_invalid SOFTFLOAT_STATE_ARG_COMMA );
|
|---|
| 83 | return
|
|---|
| 84 | (exp == 0x7FFF) && (sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ))
|
|---|
| 85 | ? i32_fromNaN
|
|---|
| 86 | : sign ? i32_fromNegOverflow : i32_fromPosOverflow;
|
|---|
| 87 | }
|
|---|
| 88 | /*------------------------------------------------------------------------
|
|---|
| 89 | *------------------------------------------------------------------------*/
|
|---|
| 90 | absZ = sig>>shiftDist;
|
|---|
| 91 | if ( exact && ((uint_fast64_t) (uint_fast32_t) absZ<<shiftDist != sig) ) {
|
|---|
| 92 | softfloat_exceptionFlags |= softfloat_flag_inexact;
|
|---|
| 93 | }
|
|---|
| 94 | return sign ? -absZ : absZ;
|
|---|
| 95 |
|
|---|
| 96 | }
|
|---|
| 97 |
|
|---|
