misc.hh revision 12697:cd71b966be1e 
1/*
2 * Copyright (c) 2011-2017 Advanced Micro Devices, Inc.
3 * All rights reserved.
4 *
5 * For use for simulation and test purposes only
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the copyright holder nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 *
33 * Authors: Steve Reinhardt
34 */
35
36#ifndef __MISC_HH__
37#define __MISC_HH__
38
39#include <bitset>
40#include <limits>
41#include <memory>
42
43#include "base/logging.hh"
44
45class GPUDynInst;
46
47typedef std::bitset<std::numeric_limits<unsigned long long>::digits> VectorMask;
48typedef std::shared_ptr<GPUDynInst> GPUDynInstPtr;
49
50class WaitClass
51{
52  public:
53    WaitClass() : nxtAvail(0), lookAheadAvail(0), tcnt(0) { }
54    void init(uint64_t *_tcnt, uint32_t _numStages=0)
55    {
56        tcnt = _tcnt;
57        numStages = _numStages;
58    }
59
60    void set(uint32_t i)
61    {
62        fatal_if(nxtAvail > *tcnt,
63                 "Can't allocate resource because it is busy!!!");
64        nxtAvail = *tcnt + i;
65    }
66    void preset(uint32_t delay)
67    {
68        lookAheadAvail = std::max(lookAheadAvail, delay + (*tcnt) - numStages);
69    }
70    bool rdy() const { return *tcnt >= nxtAvail; }
71    bool prerdy() const { return *tcnt >= lookAheadAvail; }
72
73  private:
74    // timestamp indicating when resource will be available
75    uint64_t nxtAvail;
76    // timestamp indicating when resource will be available including
77    // pending uses of the resource (when there is a cycle gap between
78    // rdy() and set()
79    uint64_t lookAheadAvail;
80    // current timestamp
81    uint64_t *tcnt;
82    // number of stages between checking if a resource is ready and
83    // setting the resource's utilization
84    uint32_t numStages;
85};
86
87class Float16
88{
89  public:
90    uint16_t val;
91
92    Float16() { val = 0; }
93
94    Float16(const Float16 &x) : val(x.val) { }
95
96    Float16(float x)
97    {
98        uint32_t ai = *(uint32_t *)&x;
99
100        uint32_t s = (ai >> 31) & 0x1;
101        uint32_t exp = (ai >> 23) & 0xff;
102        uint32_t mant = (ai >> 0) & 0x7fffff;
103
104        if (exp == 0 || exp <= 0x70) {
105            exp = 0;
106            mant = 0;
107        } else if (exp == 0xff) {
108            exp = 0x1f;
109        } else if (exp >= 0x8f) {
110            exp = 0x1f;
111            mant = 0;
112        } else {
113            exp = exp - 0x7f + 0x0f;
114        }
115
116        mant = mant >> 13;
117
118        val = 0;
119        val |= (s << 15);
120        val |= (exp << 10);
121        val |= (mant << 0);
122    }
123
124    operator float() const
125    {
126        uint32_t s = (val >> 15) & 0x1;
127        uint32_t exp = (val >> 10) & 0x1f;
128        uint32_t mant = (val >> 0) & 0x3ff;
129
130        if (!exp) {
131            exp = 0;
132            mant = 0;
133        } else if (exp == 0x1f) {
134            exp = 0xff;
135        } else {
136            exp = exp - 0x0f + 0x7f;
137        }
138
139        uint32_t val1 = 0;
140        val1 |= (s << 31);
141        val1 |= (exp << 23);
142        val1 |= (mant << 13);
143
144        return *(float*)&val1;
145    }
146};
147
148#endif // __MISC_HH__
149