2 * Copyright © 2012 Intel Corporation
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:
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
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
24 * Eric Anholt <eric@anholt.net>
28 #ifndef BRW_VEC4_LIVE_VARIABLES_H
29 #define BRW_VEC4_LIVE_VARIABLES_H
31 #include "brw_ir_vec4.h"
32 #include "brw_ir_analysis.h"
33 #include "util/bitset.h"
35 struct backend_shader
;
39 class vec4_live_variables
{
43 * Which variables are defined before being used in the block.
45 * Note that for our purposes, "defined" means unconditionally, completely
51 * Which variables are used before being defined in the block.
55 /** Which defs reach the entry point of the block. */
58 /** Which defs reach the exit point of the block. */
61 BITSET_WORD flag_def
[1];
62 BITSET_WORD flag_use
[1];
63 BITSET_WORD flag_livein
[1];
64 BITSET_WORD flag_liveout
[1];
67 vec4_live_variables(const backend_shader
*s
);
68 ~vec4_live_variables();
71 validate(const backend_shader
*s
) const;
73 analysis_dependency_class
74 dependency_class() const
76 return (DEPENDENCY_INSTRUCTION_IDENTITY
|
77 DEPENDENCY_INSTRUCTION_DATA_FLOW
|
78 DEPENDENCY_VARIABLES
);
84 /** Per-basic-block information on live variables */
85 struct block_data
*block_data
;
88 * Final computed live ranges for each variable.
94 int var_range_start(unsigned v
, unsigned n
) const;
95 int var_range_end(unsigned v
, unsigned n
) const;
96 bool vgrfs_interfere(int a
, int b
) const;
100 void compute_live_variables();
101 void compute_start_end();
103 const simple_allocator
&alloc
;
108 /* Returns the variable index for the k-th dword of the c-th component of
112 var_from_reg(const simple_allocator
&alloc
, const src_reg
®
,
113 unsigned c
= 0, unsigned k
= 0)
115 assert(reg
.file
== VGRF
&& reg
.nr
< alloc
.count
&& c
< 4);
116 const unsigned csize
= DIV_ROUND_UP(type_sz(reg
.type
), 4);
118 8 * alloc
.offsets
[reg
.nr
] + reg
.offset
/ 4 +
119 (BRW_GET_SWZ(reg
.swizzle
, c
) + k
/ csize
* 4) * csize
+ k
% csize
;
120 /* Do not exceed the limit for this register */
121 assert(result
< 8 * (alloc
.offsets
[reg
.nr
] + alloc
.sizes
[reg
.nr
]));
126 var_from_reg(const simple_allocator
&alloc
, const dst_reg
®
,
127 unsigned c
= 0, unsigned k
= 0)
129 assert(reg
.file
== VGRF
&& reg
.nr
< alloc
.count
&& c
< 4);
130 const unsigned csize
= DIV_ROUND_UP(type_sz(reg
.type
), 4);
132 8 * alloc
.offsets
[reg
.nr
] + reg
.offset
/ 4 +
133 (c
+ k
/ csize
* 4) * csize
+ k
% csize
;
134 /* Do not exceed the limit for this register */
135 assert(result
< 8 * (alloc
.offsets
[reg
.nr
] + alloc
.sizes
[reg
.nr
]));
139 } /* namespace brw */
141 #endif /* BRW_VEC4_LIVE_VARIABLES_H */