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#include "util/bitset.h"
29#include "brw_vec4.h"
30
31namespace brw {
32
33struct block_data {
34   /**
35    * Which variables are defined before being used in the block.
36    *
37    * Note that for our purposes, "defined" means unconditionally, completely
38    * defined.
39    */
40   BITSET_WORD *def;
41
42   /**
43    * Which variables are used before being defined in the block.
44    */
45   BITSET_WORD *use;
46
47   /** Which defs reach the entry point of the block. */
48   BITSET_WORD *livein;
49
50   /** Which defs reach the exit point of the block. */
51   BITSET_WORD *liveout;
52
53   BITSET_WORD flag_def[1];
54   BITSET_WORD flag_use[1];
55   BITSET_WORD flag_livein[1];
56   BITSET_WORD flag_liveout[1];
57};
58
59class vec4_live_variables {
60public:
61   DECLARE_RALLOC_CXX_OPERATORS(vec4_live_variables)
62
63   vec4_live_variables(const simple_allocator &alloc, cfg_t *cfg);
64   ~vec4_live_variables();
65
66   int num_vars;
67   int bitset_words;
68
69   /** Per-basic-block information on live variables */
70   struct block_data *block_data;
71
72protected:
73   void setup_def_use();
74   void compute_live_variables();
75
76   const simple_allocator &alloc;
77   cfg_t *cfg;
78   void *mem_ctx;
79};
80
81/* Returns the variable index for the k-th dword of the c-th component of
82 * register reg.
83 */
84inline unsigned
85var_from_reg(const simple_allocator &alloc, const src_reg &reg,
86             unsigned c = 0, unsigned k = 0)
87{
88   assert(reg.file == VGRF && reg.nr < alloc.count && c < 4);
89   const unsigned csize = DIV_ROUND_UP(type_sz(reg.type), 4);
90   unsigned result =
91      8 * (alloc.offsets[reg.nr] + reg.offset / REG_SIZE) +
92      (BRW_GET_SWZ(reg.swizzle, c) + k / csize * 4) * csize + k % csize;
93   /* Do not exceed the limit for this register */
94   assert(result < 8 * (alloc.offsets[reg.nr] + alloc.sizes[reg.nr]));
95   return result;
96}
97
98inline unsigned
99var_from_reg(const simple_allocator &alloc, const dst_reg &reg,
100             unsigned c = 0, unsigned k = 0)
101{
102   assert(reg.file == VGRF && reg.nr < alloc.count && c < 4);
103   const unsigned csize = DIV_ROUND_UP(type_sz(reg.type), 4);
104   unsigned result =
105      8 * (alloc.offsets[reg.nr] + reg.offset / REG_SIZE) +
106      (c + k / csize * 4) * csize + k % csize;
107   /* Do not exceed the limit for this register */
108   assert(result < 8 * (alloc.offsets[reg.nr] + alloc.sizes[reg.nr]));
109   return result;
110}
111
112} /* namespace brw */
113