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f32_div.c
Go to the documentation of this file.
1
2/*============================================================================
3
4This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
5Package, Release 3e, by John R. Hauser.
6
7Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
8All rights reserved.
9
10Redistribution and use in source and binary forms, with or without
11modification, 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
24THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
25EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
26WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
27DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
28DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
31ON 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
33SOFTWARE, 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
45{
46 union ui32_f32 uA;
47 uint_fast32_t uiA;
48 bool signA;
49 int_fast16_t expA;
50 uint_fast32_t sigA;
51 union ui32_f32 uB;
52 uint_fast32_t uiB;
53 bool signB;
54 int_fast16_t expB;
55 uint_fast32_t sigB;
56 bool signZ;
57 struct exp16_sig32 normExpSig;
58 int_fast16_t expZ;
59#ifdef SOFTFLOAT_FAST_DIV64TO32
60 uint_fast64_t sig64A;
61 uint_fast32_t sigZ;
62#else
63 uint_fast32_t sigZ;
64 uint_fast64_t rem;
65#endif
66 uint_fast32_t uiZ;
67 union ui32_f32 uZ;
68
69 /*------------------------------------------------------------------------
70 *------------------------------------------------------------------------*/
71 uA.f = a;
72 uiA = uA.ui;
73 signA = signF32UI( uiA );
74 expA = expF32UI( uiA );
75 sigA = fracF32UI( uiA );
76 uB.f = b;
77 uiB = uB.ui;
78 signB = signF32UI( uiB );
79 expB = expF32UI( uiB );
80 sigB = fracF32UI( uiB );
81 signZ = signA ^ signB;
82 /*------------------------------------------------------------------------
83 *------------------------------------------------------------------------*/
84 if ( expA == 0xFF ) {
85 if ( sigA ) goto propagateNaN;
86 if ( expB == 0xFF ) {
87 if ( sigB ) goto propagateNaN;
88 goto invalid;
89 }
90 goto infinity;
91 }
92 if ( expB == 0xFF ) {
93 if ( sigB ) goto propagateNaN;
94 goto zero;
95 }
96 /*------------------------------------------------------------------------
97 *------------------------------------------------------------------------*/
98 if ( ! expB ) {
99 if ( ! sigB ) {
100 if ( ! (expA | sigA) ) goto invalid;
102 goto infinity;
103 }
104 normExpSig = softfloat_normSubnormalF32Sig( sigB );
105 expB = normExpSig.exp;
106 sigB = normExpSig.sig;
107 }
108 if ( ! expA ) {
109 if ( ! sigA ) goto zero;
110 normExpSig = softfloat_normSubnormalF32Sig( sigA );
111 expA = normExpSig.exp;
112 sigA = normExpSig.sig;
113 }
114 /*------------------------------------------------------------------------
115 *------------------------------------------------------------------------*/
116 expZ = expA - expB + 0x7E;
117 sigA |= 0x00800000;
118 sigB |= 0x00800000;
119#ifdef SOFTFLOAT_FAST_DIV64TO32
120 if ( sigA < sigB ) {
121 --expZ;
122 sig64A = (uint_fast64_t) sigA<<31;
123 } else {
124 sig64A = (uint_fast64_t) sigA<<30;
125 }
126 sigZ = sig64A / sigB;
127 if ( ! (sigZ & 0x3F) ) sigZ |= ((uint_fast64_t) sigB * sigZ != sig64A);
128#else
129 if ( sigA < sigB ) {
130 --expZ;
131 sigA <<= 8;
132 } else {
133 sigA <<= 7;
134 }
135 sigB <<= 8;
136 sigZ = ((uint_fast64_t) sigA * softfloat_approxRecip32_1( sigB ))>>32;
137 /*------------------------------------------------------------------------
138 *------------------------------------------------------------------------*/
139 sigZ += 2;
140 if ( (sigZ & 0x3F) < 2 ) {
141 sigZ &= ~3;
142#ifdef SOFTFLOAT_FAST_INT64
143 rem = ((uint_fast64_t) sigA<<31) - (uint_fast64_t) sigZ * sigB;
144#else
145 rem = ((uint_fast64_t) sigA<<32) - (uint_fast64_t) (sigZ<<1) * sigB;
146#endif
147 if ( rem & UINT64_C( 0x8000000000000000 ) ) {
148 sigZ -= 4;
149 } else {
150 if ( rem ) sigZ |= 1;
151 }
152 }
153#endif
154 return softfloat_roundPackToF32( signZ, expZ, sigZ );
155 /*------------------------------------------------------------------------
156 *------------------------------------------------------------------------*/
157 propagateNaN:
158 uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
159 goto uiZ;
160 /*------------------------------------------------------------------------
161 *------------------------------------------------------------------------*/
162 invalid:
164 uiZ = defaultNaNF32UI;
165 goto uiZ;
166 /*------------------------------------------------------------------------
167 *------------------------------------------------------------------------*/
168 infinity:
169 uiZ = packToF32UI( signZ, 0xFF, 0 );
170 goto uiZ;
171 /*------------------------------------------------------------------------
172 *------------------------------------------------------------------------*/
173 zero:
174 uiZ = packToF32UI( signZ, 0, 0 );
175 uiZ:
176 uZ.ui = uiZ;
177 return uZ.f;
178
179}
180
const GenericPointer< typename T::ValueType > T2 T::AllocatorType & a
Definition pointer.h:1181
uint_fast32_t softfloat_propagateNaNF32UI(uint_fast32_t uiA, uint_fast32_t uiB)
void softfloat_raiseFlags(uint_fast8_t flags)
#define defaultNaNF32UI
Definition specialize.h:123
float32_t f32_div(float32_t a, float32_t b)
Definition f32_div.c:44
#define expF32UI(a)
Definition internals.h:105
float32_t softfloat_roundPackToF32(bool, int_fast16_t, uint_fast32_t)
struct exp16_sig32 softfloat_normSubnormalF32Sig(uint_fast32_t)
#define fracF32UI(a)
Definition internals.h:106
#define signF32UI(a)
Definition internals.h:104
#define packToF32UI(sign, exp, sig)
Definition internals.h:107
uint32_t softfloat_approxRecip32_1(uint32_t a)
@ softfloat_flag_invalid
Definition softfloat.h:89
@ softfloat_flag_infinite
Definition softfloat.h:88
uint64_t uint_fast64_t
Definition stdint.h:157
#define UINT64_C(val)
Definition stdint.h:284
uint32_t uint_fast32_t
Definition stdint.h:156
int16_t int_fast16_t
Definition stdint.h:151
uint_fast32_t sig
Definition internals.h:111
int_fast16_t exp
Definition internals.h:111
uint32_t ui
Definition internals.h:46
float32_t f
Definition internals.h:46