1 /*
2 * Copyright (c) 2012-2015 Etnaviv Project
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, sub license,
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
12 * next paragraph) shall be included in all copies or substantial portions
13 * of the 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 NON-INFRINGEMENT. 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
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Wladimir J. van der Laan <[email protected]>
25 */
26
27 #include "etnaviv_asm.h"
28 #include "etnaviv_debug.h"
29 #include "etnaviv_util.h"
30
31 #include "etnaviv/isa/isa.h"
32
33 /* An instruction can only read from one distinct uniform.
34 * This function verifies this property and returns true if the instruction
35 * is deemed correct and false otherwise.
36 */
37 static bool
check_uniforms(const struct etna_inst * inst)38 check_uniforms(const struct etna_inst *inst)
39 {
40 unsigned uni_rgroup = -1;
41 unsigned uni_reg = -1;
42 bool conflict = false;
43
44 for (unsigned i = 0; i < ETNA_NUM_SRC; i++) {
45 const struct etna_inst_src *src = &inst->src[i];
46
47 if (!etna_rgroup_is_uniform(src->rgroup))
48 continue;
49
50 if (uni_reg == -1) { /* first uniform used */
51 uni_rgroup = src->rgroup;
52 uni_reg = src->reg;
53 } else { /* second or later; check that it is a re-use */
54 if (uni_rgroup != src->rgroup || uni_reg != src->reg) {
55 conflict = true;
56 }
57 }
58 }
59
60 return !conflict;
61 }
62
63 int
etna_assemble(uint32_t * out,const struct etna_inst * inst,bool has_no_oneconst_limit)64 etna_assemble(uint32_t *out, const struct etna_inst *inst, bool has_no_oneconst_limit)
65 {
66 /* cannot have both src2 and imm */
67 if (inst->imm && inst->src[2].use)
68 return 1;
69
70 if (!has_no_oneconst_limit && !check_uniforms(inst))
71 BUG("error: generating instruction that accesses two different uniforms");
72
73 assert(!(inst->opcode&~0x7f));
74
75 isa_assemble_instruction(out, inst);
76
77 return 0;
78 }
79