1/*
2 * Copyright (c) 2009 The University of Edinburgh
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Timothy M. Jones
29 * Korey Sewell
30 */
31
32#ifndef __ARCH_POWER_INSTS_FLOATING_HH__
33#define __ARCH_POWER_INSTS_FLOATING_HH__
34
35#include "arch/power/insts/static_inst.hh"
36#include "base/bitfield.hh"
37#include "base/cprintf.hh"
38
39namespace PowerISA
40{
41
42/**
43 * Base class for floating point operations.
44 */
45class FloatOp : public PowerStaticInst
46{
47 protected:
48
49 bool rcSet;
50
51 /// Constructor
52 FloatOp(const char *mnem, MachInst _machInst, OpClass __opClass)
53 : PowerStaticInst(mnem, _machInst, __opClass)
54 {
55 }
56
57 // Test for NaN (maximum biased exponent & non-zero fraction)
58 inline bool
59 isNan(uint32_t val_bits) const
60 {
61 return ((bits(val_bits, 30, 23) == 0xFF) && bits(val_bits, 22, 0));
62 }
63
64 inline bool
65 isNan(uint64_t val_bits) const
66 {
67 return ((bits(val_bits, 62, 52) == 0x7FF) && bits(val_bits, 51, 0));
68 }
69
70 inline bool
71 isNan(float val) const
72 {
73 void *val_ptr = &val;
74 uint32_t val_bits = *(uint32_t *) val_ptr;
75 return isNan(val_bits);
76 }
77
78 inline bool
79 isNan(double val) const
80 {
81 void *val_ptr = &val;
82 uint64_t val_bits = *(uint64_t *) val_ptr;
83 return isNan(val_bits);
84 }
85
86 // Test for SNaN (NaN with high order bit of fraction set to 0)
87 inline bool
88 isSnan(uint32_t val_bits) const
89 {
90 return ((bits(val_bits, 30, 22) == 0x1FE) && bits(val_bits, 22, 0));
91 }
92
93 // Test for QNaN (NaN with high order bit of fraction set to 1)
94 inline bool
95 isQnan(uint32_t val_bits) const
96 {
97 return (bits(val_bits, 30, 22) == 0x1FF);
98 }
99
100 // Test for infinity (maximum biased exponent and zero fraction)
101 inline bool
102 isInfinity(uint32_t val_bits) const
103 {
104 return ((bits(val_bits, 30, 23) == 0xFF) && !bits(val_bits, 22, 0));
105 }
106
107 // Test for normalized numbers (biased exponent in the range 1 to 254)
108 inline bool
109 isNormalized(uint32_t val_bits) const
110 {
111 return ((bits(val_bits, 30, 23) != 0xFF) && bits(val_bits, 22, 0));
112 }
113
114 // Test for denormalized numbers (biased exponent of zero and
115 // non-zero fraction)
116 inline bool
117 isDenormalized(uint32_t val_bits) const
118 {
119 return (!bits(val_bits, 30, 23) && bits(val_bits, 22, 0));
120 }
121
122 // Test for zero (biased exponent of zero and fraction of zero)
123 inline bool
124 isZero(uint32_t val_bits) const
125 {
126 return (!bits(val_bits, 30, 23) && !bits(val_bits, 22, 0));
127 }
128
129 // Test for negative
130 inline bool
131 isNegative(uint32_t val_bits) const
132 {
133 return (bits(val_bits, 31));
134 }
135
136 // Compute the CR field
137 inline uint32_t
138 makeCRField(double a, double b) const
139 {
140 uint32_t c = 0;
141 if (isNan(a) || isNan(b)) { c = 0x1; }
142 else if (a < b) { c = 0x8; }
143 else if (a > b) { c = 0x4; }
144 else { c = 0x2; }
145 return c;
146 }
147
| 1/*
2 * Copyright (c) 2009 The University of Edinburgh
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Timothy M. Jones
29 * Korey Sewell
30 */
31
32#ifndef __ARCH_POWER_INSTS_FLOATING_HH__
33#define __ARCH_POWER_INSTS_FLOATING_HH__
34
35#include "arch/power/insts/static_inst.hh"
36#include "base/bitfield.hh"
37#include "base/cprintf.hh"
38
39namespace PowerISA
40{
41
42/**
43 * Base class for floating point operations.
44 */
45class FloatOp : public PowerStaticInst
46{
47 protected:
48
49 bool rcSet;
50
51 /// Constructor
52 FloatOp(const char *mnem, MachInst _machInst, OpClass __opClass)
53 : PowerStaticInst(mnem, _machInst, __opClass)
54 {
55 }
56
57 // Test for NaN (maximum biased exponent & non-zero fraction)
58 inline bool
59 isNan(uint32_t val_bits) const
60 {
61 return ((bits(val_bits, 30, 23) == 0xFF) && bits(val_bits, 22, 0));
62 }
63
64 inline bool
65 isNan(uint64_t val_bits) const
66 {
67 return ((bits(val_bits, 62, 52) == 0x7FF) && bits(val_bits, 51, 0));
68 }
69
70 inline bool
71 isNan(float val) const
72 {
73 void *val_ptr = &val;
74 uint32_t val_bits = *(uint32_t *) val_ptr;
75 return isNan(val_bits);
76 }
77
78 inline bool
79 isNan(double val) const
80 {
81 void *val_ptr = &val;
82 uint64_t val_bits = *(uint64_t *) val_ptr;
83 return isNan(val_bits);
84 }
85
86 // Test for SNaN (NaN with high order bit of fraction set to 0)
87 inline bool
88 isSnan(uint32_t val_bits) const
89 {
90 return ((bits(val_bits, 30, 22) == 0x1FE) && bits(val_bits, 22, 0));
91 }
92
93 // Test for QNaN (NaN with high order bit of fraction set to 1)
94 inline bool
95 isQnan(uint32_t val_bits) const
96 {
97 return (bits(val_bits, 30, 22) == 0x1FF);
98 }
99
100 // Test for infinity (maximum biased exponent and zero fraction)
101 inline bool
102 isInfinity(uint32_t val_bits) const
103 {
104 return ((bits(val_bits, 30, 23) == 0xFF) && !bits(val_bits, 22, 0));
105 }
106
107 // Test for normalized numbers (biased exponent in the range 1 to 254)
108 inline bool
109 isNormalized(uint32_t val_bits) const
110 {
111 return ((bits(val_bits, 30, 23) != 0xFF) && bits(val_bits, 22, 0));
112 }
113
114 // Test for denormalized numbers (biased exponent of zero and
115 // non-zero fraction)
116 inline bool
117 isDenormalized(uint32_t val_bits) const
118 {
119 return (!bits(val_bits, 30, 23) && bits(val_bits, 22, 0));
120 }
121
122 // Test for zero (biased exponent of zero and fraction of zero)
123 inline bool
124 isZero(uint32_t val_bits) const
125 {
126 return (!bits(val_bits, 30, 23) && !bits(val_bits, 22, 0));
127 }
128
129 // Test for negative
130 inline bool
131 isNegative(uint32_t val_bits) const
132 {
133 return (bits(val_bits, 31));
134 }
135
136 // Compute the CR field
137 inline uint32_t
138 makeCRField(double a, double b) const
139 {
140 uint32_t c = 0;
141 if (isNan(a) || isNan(b)) { c = 0x1; }
142 else if (a < b) { c = 0x8; }
143 else if (a > b) { c = 0x4; }
144 else { c = 0x2; }
145 return c;
146 }
147
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