1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*****************************************************************************
Copyright (C) 2010 University of Utah
All Rights Reserved.
Purpose:
Additional loop transformations.
Notes:
History:
07/31/10 Created by Chun Chen
*****************************************************************************/
#include <code_gen/codegen.h>
#include <code_gen/CG_utils.h>
#include "loop.hh"
#include "omegatools.hh"
#include "ir_code.hh"
#include "chill_error.hh"
using namespace omega;
void Loop::shift_to(int stmt_num, int level, int absolute_position) {
// combo
tile(stmt_num, level, 1, level, CountedTile);
std::vector<int> lex = getLexicalOrder(stmt_num);
std::set<int> active = getStatements(lex, 2 * level - 2);
shift(active, level, absolute_position);
// remove unnecessary tiled loop since tile size is one
for (std::set<int>::iterator i = active.begin(); i != active.end(); i++) {
int n = stmt[*i].xform.n_out();
Relation mapping(n, n - 2);
F_And *f_root = mapping.add_and();
for (int j = 1; j <= 2 * level; j++) {
EQ_Handle h = f_root->add_EQ();
h.update_coef(mapping.output_var(j), 1);
h.update_coef(mapping.input_var(j), -1);
}
for (int j = 2 * level + 3; j <= n; j++) {
EQ_Handle h = f_root->add_EQ();
h.update_coef(mapping.output_var(j - 2), 1);
h.update_coef(mapping.input_var(j), -1);
}
stmt[*i].xform = Composition(mapping, stmt[*i].xform);
stmt[*i].xform.simplify();
for (int j = 0; j < stmt[*i].loop_level.size(); j++)
if (j != level - 1 &&
stmt[*i].loop_level[j].type == LoopLevelTile &&
stmt[*i].loop_level[j].payload >= level)
stmt[*i].loop_level[j].payload--;
stmt[*i].loop_level.erase(stmt[*i].loop_level.begin() + level - 1);
}
}
std::set<int> Loop::unroll_extra(int stmt_num, int level, int unroll_amount, int cleanup_split_level) {
std::set<int> cleanup_stmts = unroll(stmt_num, level, unroll_amount, std::vector<std::vector<std::string> >(),
cleanup_split_level);
for (std::set<int>::iterator i = cleanup_stmts.begin(); i != cleanup_stmts.end(); i++)
unroll(*i, level, 0);
return cleanup_stmts;
}
void Loop::peel(int stmt_num, int level, int peel_amount) {
// check for sanity of parameters
if (stmt_num < 0 || stmt_num >= stmt.size())
throw std::invalid_argument("invalid statement number " + to_string(stmt_num));
if (level <= 0 || level > stmt[stmt_num].loop_level.size())
throw std::invalid_argument("invalid loop level " + to_string(level));
if (peel_amount == 0)
return;
std::set<int> subloop = getSubLoopNest(stmt_num, level);
std::vector<Relation> Rs;
for (std::set<int>::iterator i = subloop.begin(); i != subloop.end(); i++) {
Relation r = getNewIS(*i);
Relation f(r.n_set(), level);
F_And *f_root = f.add_and();
for (int j = 1; j <= level; j++) {
EQ_Handle h = f_root->add_EQ();
h.update_coef(f.input_var(2 * j), 1);
h.update_coef(f.output_var(j), -1);
}
r = Composition(f, r);
r.simplify();
Rs.push_back(r);
}
Relation hull = SimpleHull(Rs);
if (peel_amount > 0) {
GEQ_Handle bound_eq;
bool found_bound = false;
for (GEQ_Iterator e(hull.single_conjunct()->GEQs()); e; e++)
if (!(*e).has_wildcards() && (*e).get_coef(hull.set_var(level)) > 0) {
bound_eq = *e;
found_bound = true;
break;
}
if (!found_bound)
for (GEQ_Iterator e(hull.single_conjunct()->GEQs()); e; e++)
if ((*e).has_wildcards() && (*e).get_coef(hull.set_var(level)) > 0) {
bool is_bound = true;
for (Constr_Vars_Iter cvi(*e, true); cvi; cvi++) {
std::pair<bool, GEQ_Handle> result = find_floor_definition(hull, cvi.curr_var());
if (!result.first) {
is_bound = false;
break;
}
}
if (is_bound) {
bound_eq = *e;
found_bound = true;
break;
}
}
if (!found_bound)
throw loop_error("can't find lower bound for peeling at loop level " + to_string(level));
for (int i = 1; i <= peel_amount; i++) {
Relation r(level);
F_Exists *f_exists = r.add_and()->add_exists();
F_And *f_root = f_exists->add_and();
GEQ_Handle h = f_root->add_GEQ();
std::map<Variable_ID, Variable_ID> exists_mapping;
for (Constr_Vars_Iter cvi(bound_eq); cvi; cvi++)
switch (cvi.curr_var()->kind()) {
case Input_Var:
h.update_coef(r.set_var(cvi.curr_var()->get_position()), cvi.curr_coef());
break;
case Wildcard_Var: {
Variable_ID v = replicate_floor_definition(hull, cvi.curr_var(), r, f_exists, f_root, exists_mapping);
h.update_coef(v, cvi.curr_coef());
break;
}
case Global_Var: {
Global_Var_ID g = cvi.curr_var()->get_global_var();
Variable_ID v;
if (g->arity() == 0)
v = r.get_local(g);
else
v = r.get_local(g, cvi.curr_var()->function_of());
h.update_coef(v, cvi.curr_coef());
break;
}
default:
assert(false);
}
h.update_const(bound_eq.get_const() - i);
r.simplify();
split(stmt_num, level, r);
}
} else { // peel_amount < 0
GEQ_Handle bound_eq;
bool found_bound = false;
for (GEQ_Iterator e(hull.single_conjunct()->GEQs()); e; e++)
if (!(*e).has_wildcards() && (*e).get_coef(hull.set_var(level)) < 0) {
bound_eq = *e;
found_bound = true;
break;
}
if (!found_bound)
for (GEQ_Iterator e(hull.single_conjunct()->GEQs()); e; e++)
if ((*e).has_wildcards() && (*e).get_coef(hull.set_var(level)) < 0) {
bool is_bound = true;
for (Constr_Vars_Iter cvi(*e, true); cvi; cvi++) {
std::pair<bool, GEQ_Handle> result = find_floor_definition(hull, cvi.curr_var());
if (!result.first) {
is_bound = false;
break;
}
}
if (is_bound) {
bound_eq = *e;
found_bound = true;
break;
}
}
if (!found_bound)
throw loop_error("can't find upper bound for peeling at loop level " + to_string(level));
for (int i = 1; i <= -peel_amount; i++) {
Relation r(level);
F_Exists *f_exists = r.add_and()->add_exists();
F_And *f_root = f_exists->add_and();
GEQ_Handle h = f_root->add_GEQ();
std::map<Variable_ID, Variable_ID> exists_mapping;
for (Constr_Vars_Iter cvi(bound_eq); cvi; cvi++)
switch (cvi.curr_var()->kind()) {
case Input_Var:
h.update_coef(r.set_var(cvi.curr_var()->get_position()), cvi.curr_coef());
break;
case Wildcard_Var: {
Variable_ID v = replicate_floor_definition(hull, cvi.curr_var(), r, f_exists, f_root, exists_mapping);
h.update_coef(v, cvi.curr_coef());
break;
}
case Global_Var: {
Global_Var_ID g = cvi.curr_var()->get_global_var();
Variable_ID v;
if (g->arity() == 0)
v = r.get_local(g);
else
v = r.get_local(g, cvi.curr_var()->function_of());
h.update_coef(v, cvi.curr_coef());
break;
}
default:
assert(false);
}
h.update_const(bound_eq.get_const() - i);
r.simplify();
split(stmt_num, level, r);
}
}
}
|
