| 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 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 <stdint.h>
|
|---|
| 38 | #include "platform.h"
|
|---|
| 39 | #include "primitiveTypes.h"
|
|---|
| 40 |
|
|---|
| 41 | #ifndef softfloat_sub256M
|
|---|
| 42 | # include "primitives.h" /* VBox: Missing prototype */
|
|---|
| 43 |
|
|---|
| 44 | void
|
|---|
| 45 | softfloat_sub256M(
|
|---|
| 46 | const uint64_t *aPtr, const uint64_t *bPtr, uint64_t *zPtr )
|
|---|
| 47 | {
|
|---|
| 48 | unsigned int index;
|
|---|
| 49 | uint_fast8_t borrow;
|
|---|
| 50 | uint64_t wordA, wordB;
|
|---|
| 51 |
|
|---|
| 52 | index = indexWordLo( 4 );
|
|---|
| 53 | borrow = 0;
|
|---|
| 54 | for (;;) {
|
|---|
| 55 | wordA = aPtr[index];
|
|---|
| 56 | wordB = bPtr[index];
|
|---|
| 57 | zPtr[index] = wordA - wordB - borrow;
|
|---|
| 58 | if ( index == indexWordHi( 4 ) ) break;
|
|---|
| 59 | borrow = borrow ? (wordA <= wordB) : (wordA < wordB);
|
|---|
| 60 | index += wordIncr;
|
|---|
| 61 | }
|
|---|
| 62 |
|
|---|
| 63 | }
|
|---|
| 64 |
|
|---|
| 65 | #endif
|
|---|
| 66 |
|
|---|
