2 /*============================================================================
4 This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
5 Package, Release 3d, by John R. Hauser.
7 Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
8 University of California. All rights reserved.
10 Redistribution and use in source and binary forms, with or without
11 modification, are permitted provided that the following conditions are met:
13 1. Redistributions of source code must retain the above copyright notice,
14 this list of conditions, and the following disclaimer.
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.
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.
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.
35 =============================================================================*/
40 #include "internals.h"
41 #include "specialize.h"
42 #include "softfloat.h"
44 float16_t
softfloat_addMagsF16( uint_fast16_t uiA
, uint_fast16_t uiB
)
55 uint_fast16_t sigX
, sigY
;
56 int_fast8_t shiftDist
;
58 int_fast8_t roundingMode
;
61 /*------------------------------------------------------------------------
62 *------------------------------------------------------------------------*/
63 expA
= expF16UI( uiA
);
64 sigA
= fracF16UI( uiA
);
65 expB
= expF16UI( uiB
);
66 sigB
= fracF16UI( uiB
);
67 /*------------------------------------------------------------------------
68 *------------------------------------------------------------------------*/
69 expDiff
= expA
- expB
;
71 /*--------------------------------------------------------------------
72 *--------------------------------------------------------------------*/
78 if ( sigA
| sigB
) goto propagateNaN
;
82 signZ
= signF16UI( uiA
);
84 sigZ
= 0x0800 + sigA
+ sigB
;
85 if ( ! (sigZ
& 1) && (expZ
< 0x1E) ) {
91 /*--------------------------------------------------------------------
92 *--------------------------------------------------------------------*/
93 signZ
= signF16UI( uiA
);
95 /*----------------------------------------------------------------
96 *----------------------------------------------------------------*/
98 if ( sigB
) goto propagateNaN
;
99 uiZ
= packToF16UI( signZ
, 0x1F, 0 );
102 if ( expDiff
<= -13 ) {
103 uiZ
= packToF16UI( signZ
, expB
, sigB
);
104 if ( expA
| sigA
) goto addEpsilon
;
108 sigX
= sigB
| 0x0400;
109 sigY
= sigA
+ (expA
? 0x0400 : sigA
);
110 shiftDist
= 19 + expDiff
;
112 /*----------------------------------------------------------------
113 *----------------------------------------------------------------*/
115 if ( expA
== 0x1F ) {
116 if ( sigA
) goto propagateNaN
;
119 if ( 13 <= expDiff
) {
120 if ( expB
| sigB
) goto addEpsilon
;
124 sigX
= sigA
| 0x0400;
125 sigY
= sigB
+ (expB
? 0x0400 : sigB
);
126 shiftDist
= 19 - expDiff
;
129 ((uint_fast32_t) sigX
<<19) + ((uint_fast32_t) sigY
<<shiftDist
);
130 if ( sig32Z
< 0x40000000 ) {
135 if ( sig32Z
& 0xFFFF ) {
138 if ( ! (sigZ
& 0xF) && (expZ
< 0x1E) ) {
144 return softfloat_roundPackToF16( signZ
, expZ
, sigZ
);
145 /*------------------------------------------------------------------------
146 *------------------------------------------------------------------------*/
148 uiZ
= softfloat_propagateNaNF16UI( uiA
, uiB
);
150 /*------------------------------------------------------------------------
151 *------------------------------------------------------------------------*/
153 roundingMode
= softfloat_roundingMode
;
154 if ( roundingMode
!= softfloat_round_near_even
) {
157 == (signF16UI( uiZ
) ? softfloat_round_min
158 : softfloat_round_max
)
161 if ( (uint16_t) (uiZ
<<1) == 0xF800 ) {
162 softfloat_raiseFlags(
163 softfloat_flag_overflow
| softfloat_flag_inexact
);
166 #ifdef SOFTFLOAT_ROUND_ODD
167 else if ( roundingMode
== softfloat_round_odd
) {
172 softfloat_exceptionFlags
|= softfloat_flag_inexact
;
174 /*------------------------------------------------------------------------
175 *------------------------------------------------------------------------*/
177 uiZ
= packToF16UI( signZ
, expZ
, sigZ
);