| 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 |
|
|---|
| 42 | float128_t
|
|---|
| 43 | softfloat_normRoundPackToF128(
|
|---|
| 44 | bool sign, int_fast32_t exp, uint_fast64_t sig64, uint_fast64_t sig0 SOFTFLOAT_STATE_DECL_COMMA )
|
|---|
| 45 | {
|
|---|
| 46 | int_fast8_t shiftDist;
|
|---|
| 47 | struct uint128 sig128;
|
|---|
| 48 | union ui128_f128 uZ;
|
|---|
| 49 | uint_fast64_t sigExtra;
|
|---|
| 50 | struct uint128_extra sig128Extra;
|
|---|
| 51 |
|
|---|
| 52 | if ( ! sig64 ) {
|
|---|
| 53 | exp -= 64;
|
|---|
| 54 | sig64 = sig0;
|
|---|
| 55 | sig0 = 0;
|
|---|
| 56 | }
|
|---|
| 57 | shiftDist = softfloat_countLeadingZeros64( sig64 ) - 15;
|
|---|
| 58 | exp -= shiftDist;
|
|---|
| 59 | if ( 0 <= shiftDist ) {
|
|---|
| 60 | if ( shiftDist ) {
|
|---|
| 61 | sig128 = softfloat_shortShiftLeft128( sig64, sig0, shiftDist );
|
|---|
| 62 | sig64 = sig128.v64;
|
|---|
| 63 | sig0 = sig128.v0;
|
|---|
| 64 | }
|
|---|
| 65 | if ( (uint32_t) exp < 0x7FFD ) {
|
|---|
| 66 | uZ.ui.v64 = packToF128UI64( sign, sig64 | sig0 ? exp : 0, sig64 );
|
|---|
| 67 | uZ.ui.v0 = sig0;
|
|---|
| 68 | return uZ.f;
|
|---|
| 69 | }
|
|---|
| 70 | sigExtra = 0;
|
|---|
| 71 | } else {
|
|---|
| 72 | sig128Extra =
|
|---|
| 73 | softfloat_shortShiftRightJam128Extra( sig64, sig0, 0, -shiftDist );
|
|---|
| 74 | sig64 = sig128Extra.v.v64;
|
|---|
| 75 | sig0 = sig128Extra.v.v0;
|
|---|
| 76 | sigExtra = sig128Extra.extra;
|
|---|
| 77 | }
|
|---|
| 78 | return softfloat_roundPackToF128( sign, exp, sig64, sig0, sigExtra SOFTFLOAT_STATE_ARG_COMMA );
|
|---|
| 79 |
|
|---|
| 80 | }
|
|---|
| 81 |
|
|---|
