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
34namespace brw {
35
36struct 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
62class vec4_live_variables {
63public:
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
75protected:
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 */
87inline unsigned
88var_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
101inline unsigned
102var_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