2 * Copyright © 2010 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>
36 * This should be done once at backend initializaion, as
37 * ra_set_finalize is O(r^2*c^2). The registers may be virtual
38 * registers, such as aligned register pairs that conflict with the
39 * two real registers from which they are composed.
41 struct ra_regs
*ra_alloc_reg_set(void *mem_ctx
, unsigned int count
);
42 void ra_set_allocate_round_robin(struct ra_regs
*regs
);
43 unsigned int ra_alloc_reg_class(struct ra_regs
*regs
);
44 void ra_add_reg_conflict(struct ra_regs
*regs
,
45 unsigned int r1
, unsigned int r2
);
46 void ra_add_transitive_reg_conflict(struct ra_regs
*regs
,
47 unsigned int base_reg
, unsigned int reg
);
48 void ra_class_add_reg(struct ra_regs
*regs
, unsigned int c
, unsigned int reg
);
49 void ra_set_num_conflicts(struct ra_regs
*regs
, unsigned int class_a
,
50 unsigned int class_b
, unsigned int num_conflicts
);
51 void ra_set_finalize(struct ra_regs
*regs
, unsigned int **conflicts
);
54 /** @{ Interference graph setup.
56 * Each interference graph node is a virtual variable in the IL. It
57 * is up to the user to ra_set_node_class() for the virtual variable,
58 * and compute live ranges and ra_node_interfere() between conflicting
61 struct ra_graph
*ra_alloc_interference_graph(struct ra_regs
*regs
,
63 void ra_set_node_class(struct ra_graph
*g
, unsigned int n
, unsigned int c
);
64 void ra_add_node_interference(struct ra_graph
*g
,
65 unsigned int n1
, unsigned int n2
);
68 /** @{ Graph-coloring register allocation */
69 bool ra_simplify(struct ra_graph
*g
);
70 void ra_optimistic_color(struct ra_graph
*g
);
71 bool ra_select(struct ra_graph
*g
);
72 bool ra_allocate_no_spills(struct ra_graph
*g
);
74 unsigned int ra_get_node_reg(struct ra_graph
*g
, unsigned int n
);
75 void ra_set_node_reg(struct ra_graph
* g
, unsigned int n
, unsigned int reg
);
76 void ra_set_node_spill_cost(struct ra_graph
*g
, unsigned int n
, float cost
);
77 int ra_get_best_spill_node(struct ra_graph
*g
);