1 /*
2  * Copyright © 2012 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  *
23  * Authors:
24  *    Eric Anholt <eric@anholt.net>
25  *
26  */
27 
28 #ifndef BRW_VEC4_LIVE_VARIABLES_H
29 #define BRW_VEC4_LIVE_VARIABLES_H
30 
31 #include "util/bitset.h"
32 #include "brw_vec4.h"
33 
34 namespace brw {
35 
36 struct block_data {
37    /**
38     * Which variables are defined before being used in the block.
39     *
40     * Note that for our purposes, "defined" means unconditionally, completely
41     * defined.
42     */
43    BITSET_WORD *def;
44 
45    /**
46     * Which variables are used before being defined in the block.
47     */
48    BITSET_WORD *use;
49 
50    /** Which defs reach the entry point of the block. */
51    BITSET_WORD *livein;
52 
53    /** Which defs reach the exit point of the block. */
54    BITSET_WORD *liveout;
55 
56    BITSET_WORD flag_def[1];
57    BITSET_WORD flag_use[1];
58    BITSET_WORD flag_livein[1];
59    BITSET_WORD flag_liveout[1];
60 };
61 
62 class vec4_live_variables {
63 public:
64    DECLARE_RALLOC_CXX_OPERATORS(vec4_live_variables)
65 
66    vec4_live_variables(const simple_allocator &alloc, cfg_t *cfg);
67    ~vec4_live_variables();
68 
69    int num_vars;
70    int bitset_words;
71 
72    /** Per-basic-block information on live variables */
73    struct block_data *block_data;
74 
75 protected:
76    void setup_def_use();
77    void compute_live_variables();
78 
79    const simple_allocator &alloc;
80    cfg_t *cfg;
81    void *mem_ctx;
82 };
83 
84 /* Returns the variable index for the k-th dword of the c-th component of
85  * register reg.
86  */
87 inline unsigned
88 var_from_reg(const simple_allocator &alloc, const src_reg &reg,
89              unsigned c = 0, unsigned k = 0)
90 {
91    assert(reg.file == VGRF && reg.nr < alloc.count && c < 4);
92    const unsigned csize = DIV_ROUND_UP(type_sz(reg.type), 4);
93    unsigned result =
94       8 * alloc.offsets[reg.nr] + reg.offset / 4 +
95       (BRW_GET_SWZ(reg.swizzle, c) + k / csize * 4) * csize + k % csize;
96    /* Do not exceed the limit for this register */
97    assert(result < 8 * (alloc.offsets[reg.nr] + alloc.sizes[reg.nr]));
98    return result;
99 }
100 
101 inline unsigned
102 var_from_reg(const simple_allocator &alloc, const dst_reg &reg,
103              unsigned c = 0, unsigned k = 0)
104 {
105    assert(reg.file == VGRF && reg.nr < alloc.count && c < 4);
106    const unsigned csize = DIV_ROUND_UP(type_sz(reg.type), 4);
107    unsigned result =
108       8 * alloc.offsets[reg.nr] + reg.offset / 4 +
109       (c + k / csize * 4) * csize + k % csize;
110    /* Do not exceed the limit for this register */
111    assert(result < 8 * (alloc.offsets[reg.nr] + alloc.sizes[reg.nr]));
112    return result;
113 }
114 
115 } /* namespace brw */
116 
117 #endif /* BRW_VEC4_LIVE_VARIABLES_H */
118