1 /*
2 * Copyright © 2014 Broadcom
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
24 /**
25 * @file vc4_qir_emit_uniform_stream_resets.c
26 *
27 * Adds updates to the uniform stream address at the start of each basic block
28 * that uses uniforms.
29 *
30 * This will be done just before the translation to QPU instructions, once we
31 * have performed optimization know how many uniforms are used in each block.
32 */
33
34 #include "vc4_qir.h"
35 #include "util/hash_table.h"
36 #include "util/u_math.h"
37
38 static bool
block_reads_any_uniform(struct qblock * block)39 block_reads_any_uniform(struct qblock *block)
40 {
41 qir_for_each_inst(inst, block) {
42 if (qir_has_uniform_read(inst))
43 return true;
44 }
45
46 return false;
47 }
48
49 void
qir_emit_uniform_stream_resets(struct vc4_compile * c)50 qir_emit_uniform_stream_resets(struct vc4_compile *c)
51 {
52 uint32_t uniform_count = 0;
53
54 qir_for_each_block(block, c) {
55 if (block != qir_entry_block(c) &&
56 (block_reads_any_uniform(block) ||
57 block == qir_exit_block(c))) {
58 struct qreg t = qir_get_temp(c);
59 struct qreg uni_addr =
60 qir_uniform(c, QUNIFORM_UNIFORMS_ADDRESS, 0);
61
62 /* Load the offset of the next uniform in the stream
63 * after the one we're generating here.
64 */
65 struct qinst *load_imm =
66 qir_inst(QOP_LOAD_IMM,
67 t,
68 qir_reg(QFILE_LOAD_IMM,
69 (uniform_count + 1) * 4),
70 c->undef);
71 struct qinst *add =
72 qir_inst(QOP_UNIFORMS_RESET, c->undef,
73 t, uni_addr);
74
75 /* Pushes to the top of the block, so in reverse
76 * order.
77 */
78 list_add(&add->link, &block->instructions);
79 list_add(&load_imm->link, &block->instructions);
80 }
81
82 qir_for_each_inst(inst, block) {
83 if (qir_has_uniform_read(inst))
84 uniform_count++;
85 }
86 }
87 }
88