2 * Copyright © 2014 Broadcom
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
27 #include "vc4_context.h"
32 vc4_dump_program(struct qcompile
*c
)
34 fprintf(stderr
, "%s:\n", qir_get_stage_name(c
->stage
));
36 for (int i
= 0; i
< c
->qpu_inst_count
; i
++) {
37 fprintf(stderr
, "0x%016"PRIx64
" ", c
->qpu_insts
[i
]);
38 vc4_qpu_disasm(&c
->qpu_insts
[i
], 1);
39 fprintf(stderr
, "\n");
43 struct queued_qpu_inst
{
44 struct simple_node link
;
49 queue(struct qcompile
*c
, uint64_t inst
)
51 struct queued_qpu_inst
*q
= calloc(1, sizeof(*q
));
53 insert_at_tail(&c
->qpu_inst_list
, &q
->link
);
57 last_inst(struct qcompile
*c
)
59 struct queued_qpu_inst
*q
=
60 (struct queued_qpu_inst
*)last_elem(&c
->qpu_inst_list
);
65 * This is used to resolve the fact that we might register-allocate two
66 * different operands of an instruction to the same physical register file
67 * even though instructions have only one field for the register file source
70 * In that case, we need to move one to a temporary that can be used in the
71 * instruction, instead.
74 fixup_raddr_conflict(struct qcompile
*c
,
75 struct qpu_reg src0
, struct qpu_reg
*src1
)
77 if ((src0
.mux
== QPU_MUX_A
|| src0
.mux
== QPU_MUX_B
) &&
78 (src1
->mux
== QPU_MUX_A
|| src1
->mux
== QPU_MUX_B
) &&
79 src0
.addr
!= src1
->addr
) {
80 queue(c
, qpu_inst(qpu_a_MOV(qpu_r3(), *src1
),
87 serialize_one_inst(struct qcompile
*c
, uint64_t inst
)
89 if (c
->qpu_inst_count
>= c
->qpu_inst_size
) {
90 c
->qpu_inst_size
= MAX2(16, c
->qpu_inst_size
* 2);
91 c
->qpu_insts
= realloc(c
->qpu_insts
,
92 c
->qpu_inst_size
* sizeof(uint64_t));
94 c
->qpu_insts
[c
->qpu_inst_count
++] = inst
;
98 serialize_insts(struct qcompile
*c
)
100 int last_sfu_write
= -10;
102 while (!is_empty_list(&c
->qpu_inst_list
)) {
103 struct queued_qpu_inst
*q
=
104 (struct queued_qpu_inst
*)first_elem(&c
->qpu_inst_list
);
105 uint32_t last_waddr_a
= QPU_W_NOP
, last_waddr_b
= QPU_W_NOP
;
106 uint32_t raddr_a
= QPU_GET_FIELD(q
->inst
, QPU_RADDR_A
);
107 uint32_t raddr_b
= QPU_GET_FIELD(q
->inst
, QPU_RADDR_B
);
109 if (c
->qpu_inst_count
> 0) {
110 uint64_t last_inst
= c
->qpu_insts
[c
->qpu_inst_count
-
112 uint32_t last_waddr_add
= QPU_GET_FIELD(last_inst
,
114 uint32_t last_waddr_mul
= QPU_GET_FIELD(last_inst
,
117 if (last_inst
& QPU_WS
) {
118 last_waddr_a
= last_waddr_mul
;
119 last_waddr_b
= last_waddr_add
;
121 last_waddr_a
= last_waddr_add
;
122 last_waddr_b
= last_waddr_mul
;
126 uint32_t src_muxes
[] = {
127 QPU_GET_FIELD(q
->inst
, QPU_ADD_A
),
128 QPU_GET_FIELD(q
->inst
, QPU_ADD_B
),
129 QPU_GET_FIELD(q
->inst
, QPU_MUL_A
),
130 QPU_GET_FIELD(q
->inst
, QPU_MUL_B
),
133 /* "An instruction must not read from a location in physical
134 * regfile A or B that was written to by the previous
137 bool needs_raddr_vs_waddr_nop
= false;
138 bool reads_r4
= false;
139 for (int i
= 0; i
< ARRAY_SIZE(src_muxes
); i
++) {
141 src_muxes
[i
] == QPU_MUX_A
&&
142 last_waddr_a
== raddr_a
) ||
144 src_muxes
[i
] == QPU_MUX_B
&&
145 last_waddr_b
== raddr_b
)) {
146 needs_raddr_vs_waddr_nop
= true;
148 if (src_muxes
[i
] == QPU_MUX_R4
)
152 if (needs_raddr_vs_waddr_nop
) {
153 serialize_one_inst(c
, qpu_inst(qpu_a_NOP(),
157 /* "After an SFU lookup instruction, accumulator r4 must not
158 * be read in the following two instructions. Any other
159 * instruction that results in r4 being written (that is, TMU
160 * read, TLB read, SFU lookup) cannot occur in the two
161 * instructions following an SFU lookup."
164 while (c
->qpu_inst_count
- last_sfu_write
< 3) {
165 serialize_one_inst(c
, qpu_inst(qpu_a_NOP(),
170 uint32_t waddr_a
= QPU_GET_FIELD(q
->inst
, QPU_WADDR_ADD
);
171 uint32_t waddr_m
= QPU_GET_FIELD(q
->inst
, QPU_WADDR_MUL
);
172 if ((waddr_a
>= QPU_W_SFU_RECIP
&& waddr_a
<= QPU_W_SFU_LOG
) ||
173 (waddr_m
>= QPU_W_SFU_RECIP
&& waddr_m
<= QPU_W_SFU_LOG
)) {
174 last_sfu_write
= c
->qpu_inst_count
;
177 serialize_one_inst(c
, q
->inst
);
179 remove_from_list(&q
->link
);
185 vc4_generate_code(struct qcompile
*c
)
187 struct qpu_reg allocate_to_qpu_reg
[3 + 32 + 32];
188 bool reg_in_use
[ARRAY_SIZE(allocate_to_qpu_reg
)];
189 int *reg_allocated
= calloc(c
->num_temps
, sizeof(*reg_allocated
));
190 int *reg_uses_remaining
=
191 calloc(c
->num_temps
, sizeof(*reg_uses_remaining
));
193 for (int i
= 0; i
< ARRAY_SIZE(reg_in_use
); i
++)
194 reg_in_use
[i
] = false;
195 for (int i
= 0; i
< c
->num_temps
; i
++)
196 reg_allocated
[i
] = -1;
197 for (int i
= 0; i
< 3; i
++)
198 allocate_to_qpu_reg
[i
] = qpu_rn(i
);
199 for (int i
= 0; i
< 32; i
++)
200 allocate_to_qpu_reg
[i
+ 3] = qpu_ra(i
);
201 for (int i
= 0; i
< 32; i
++)
202 allocate_to_qpu_reg
[i
+ 3 + 32] = qpu_rb(i
);
204 make_empty_list(&c
->qpu_inst_list
);
206 struct simple_node
*node
;
207 foreach(node
, &c
->instructions
) {
208 struct qinst
*qinst
= (struct qinst
*)node
;
210 if (qinst
->dst
.file
== QFILE_TEMP
)
211 reg_uses_remaining
[qinst
->dst
.index
]++;
212 for (int i
= 0; i
< qir_get_op_nsrc(qinst
->op
); i
++) {
213 if (qinst
->src
[i
].file
== QFILE_TEMP
)
214 reg_uses_remaining
[qinst
->src
[i
].index
]++;
221 queue(c
, qpu_load_imm_ui(qpu_vrsetup(), 0x00401a00));
222 queue(c
, qpu_load_imm_ui(qpu_vwsetup(), 0x00001a00));
228 foreach(node
, &c
->instructions
) {
229 struct qinst
*qinst
= (struct qinst
*)node
;
232 fprintf(stderr
, "translating qinst to qpu: ");
233 qir_dump_inst(qinst
);
234 fprintf(stderr
, "\n");
237 static const struct {
241 #define A(name) [QOP_##name] = {QPU_A_##name, false}
242 #define M(name) [QOP_##name] = {QPU_M_##name, true}
254 static const uint32_t compareflags
[] = {
255 [QOP_SEQ
- QOP_SEQ
] = QPU_COND_ZS
,
256 [QOP_SNE
- QOP_SEQ
] = QPU_COND_ZC
,
257 [QOP_SLT
- QOP_SEQ
] = QPU_COND_NS
,
258 [QOP_SGE
- QOP_SEQ
] = QPU_COND_NC
,
261 struct qpu_reg src
[4];
262 for (int i
= 0; i
< qir_get_op_nsrc(qinst
->op
); i
++) {
263 int index
= qinst
->src
[i
].index
;
264 switch (qinst
->src
[i
].file
) {
269 assert(reg_allocated
[index
] != -1);
270 src
[i
] = allocate_to_qpu_reg
[reg_allocated
[index
]];
271 reg_uses_remaining
[index
]--;
272 if (reg_uses_remaining
[index
] == 0)
273 reg_in_use
[reg_allocated
[index
]] = false;
285 switch (qinst
->dst
.file
) {
287 dst
= qpu_ra(QPU_W_NOP
);
291 if (reg_allocated
[qinst
->dst
.index
] == -1) {
294 alloc
< ARRAY_SIZE(reg_in_use
);
296 /* The pack flags require an A-file register. */
297 if (qinst
->op
== QOP_PACK_SCALED
&&
298 allocate_to_qpu_reg
[alloc
].mux
!= QPU_MUX_A
) {
302 if (!reg_in_use
[alloc
])
305 assert(alloc
!= ARRAY_SIZE(reg_in_use
) && "need better reg alloc");
306 reg_in_use
[alloc
] = true;
307 reg_allocated
[qinst
->dst
.index
] = alloc
;
310 dst
= allocate_to_qpu_reg
[reg_allocated
[qinst
->dst
.index
]];
312 reg_uses_remaining
[qinst
->dst
.index
]--;
313 if (reg_uses_remaining
[qinst
->dst
.index
] == 0) {
314 reg_in_use
[reg_allocated
[qinst
->dst
.index
]] =
321 assert(!"not reached");
327 /* Skip emitting the MOV if it's a no-op. */
328 if (dst
.mux
== QPU_MUX_A
|| dst
.mux
== QPU_MUX_B
||
329 dst
.mux
!= src
[0].mux
|| dst
.addr
!= src
[0].addr
) {
330 queue(c
, qpu_inst(qpu_a_MOV(dst
, src
[0]),
336 queue(c
, qpu_inst(qpu_a_MOV(qpu_ra(QPU_W_NOP
),
339 *last_inst(c
) |= QPU_SF
;
341 if (dst
.mux
<= QPU_MUX_R3
) {
342 fixup_raddr_conflict(c
, src
[1], &src
[2]);
343 queue(c
, qpu_inst(qpu_a_MOV(dst
, src
[1]),
344 qpu_m_MOV(dst
, src
[2])));
345 *last_inst(c
) = ((*last_inst(c
) & ~(QPU_COND_ADD_MASK
|
347 | QPU_SET_FIELD(QPU_COND_NS
,
349 | QPU_SET_FIELD(QPU_COND_NC
,
352 if (dst
.mux
== src
[1].mux
&&
353 dst
.addr
== src
[1].addr
) {
354 queue(c
, qpu_inst(qpu_a_MOV(dst
, src
[1]),
357 queue(c
, qpu_inst(qpu_a_MOV(dst
, src
[2]),
359 *last_inst(c
) = ((*last_inst(c
) & ~(QPU_COND_ADD_MASK
))
360 | QPU_SET_FIELD(QPU_COND_NC
,
363 queue(c
, qpu_inst(qpu_a_MOV(dst
, src
[2]),
366 queue(c
, qpu_inst(qpu_a_MOV(dst
, src
[1]),
368 *last_inst(c
) = ((*last_inst(c
) & ~(QPU_COND_ADD_MASK
))
369 | QPU_SET_FIELD(QPU_COND_NS
,
379 fixup_raddr_conflict(c
, src
[0], &src
[1]);
380 queue(c
, qpu_inst(qpu_a_SUB(qpu_ra(QPU_W_NOP
),
383 *last_inst(c
) |= QPU_SF
;
385 queue(c
, qpu_load_imm_f(dst
, 0.0));
386 queue(c
, qpu_load_imm_f(dst
, 1.0));
387 *last_inst(c
) = ((*last_inst(c
) & ~QPU_COND_ADD_MASK
)
388 | QPU_SET_FIELD(compareflags
[qinst
->op
- QOP_SEQ
],
394 queue(c
, qpu_inst(qpu_a_MOV(qpu_ra(QPU_W_VPM
), src
[0]),
399 queue(c
, qpu_inst(qpu_a_MOV(dst
, qpu_ra(QPU_R_VPM
)),
409 queue(c
, qpu_inst(qpu_a_MOV(qpu_rb(QPU_W_SFU_RECIP
),
414 queue(c
, qpu_inst(qpu_a_MOV(qpu_rb(QPU_W_SFU_RECIPSQRT
),
419 queue(c
, qpu_inst(qpu_a_MOV(qpu_rb(QPU_W_SFU_EXP
),
424 queue(c
, qpu_inst(qpu_a_MOV(qpu_rb(QPU_W_SFU_LOG
),
432 queue(c
, qpu_inst(qpu_a_MOV(dst
, qpu_r4()),
437 case QOP_PACK_COLORS
:
438 for (int i
= 0; i
< 4; i
++) {
439 queue(c
, qpu_inst(qpu_a_NOP(),
440 qpu_m_MOV(qpu_r3(), src
[i
])));
441 *last_inst(c
) |= QPU_PM
;
442 *last_inst(c
) |= QPU_SET_FIELD(QPU_PACK_MUL_8A
+ i
,
446 queue(c
, qpu_inst(qpu_a_MOV(dst
, qpu_r3()),
451 case QOP_TLB_COLOR_WRITE
:
452 queue(c
, qpu_inst(qpu_a_MOV(qpu_tlbc(),
458 queue(c
, qpu_inst(qpu_a_FADD(dst
,
463 case QOP_PACK_SCALED
:
464 queue(c
, qpu_inst(qpu_a_MOV(dst
, src
[0]),
466 *last_inst(c
) |= QPU_SET_FIELD(QPU_PACK_A_16A
,
469 queue(c
, qpu_inst(qpu_a_MOV(dst
, src
[1]),
471 *last_inst(c
) |= QPU_SET_FIELD(QPU_PACK_A_16B
,
477 assert(qinst
->op
< ARRAY_SIZE(translate
));
478 assert(translate
[qinst
->op
].op
!= 0); /* NOPs */
480 /* If we have only one source, put it in the second
481 * argument slot as well so that we don't take up
482 * another raddr just to get unused data.
484 if (qir_get_op_nsrc(qinst
->op
) == 1)
487 fixup_raddr_conflict(c
, src
[0], &src
[1]);
489 if (translate
[qinst
->op
].is_mul
) {
490 queue(c
, qpu_inst(qpu_a_NOP(),
491 qpu_m_alu2(translate
[qinst
->op
].op
,
495 queue(c
, qpu_inst(qpu_a_alu2(translate
[qinst
->op
].op
,
506 /* thread end can't have VPM write */
507 if (QPU_GET_FIELD(c
->qpu_insts
[c
->qpu_inst_count
- 1],
508 QPU_WADDR_ADD
) == QPU_W_VPM
||
509 QPU_GET_FIELD(c
->qpu_insts
[c
->qpu_inst_count
- 1],
510 QPU_WADDR_MUL
) == QPU_W_VPM
) {
511 serialize_one_inst(c
, qpu_inst(qpu_a_NOP(), qpu_m_NOP()));
514 c
->qpu_insts
[c
->qpu_inst_count
- 1] =
515 qpu_set_sig(c
->qpu_insts
[c
->qpu_inst_count
- 1],
517 serialize_one_inst(c
, qpu_inst(qpu_a_NOP(), qpu_m_NOP()));
518 serialize_one_inst(c
, qpu_inst(qpu_a_NOP(), qpu_m_NOP()));
525 c
->qpu_insts
[2] = qpu_set_sig(c
->qpu_insts
[2],
526 QPU_SIG_WAIT_FOR_SCOREBOARD
);
527 c
->qpu_insts
[c
->qpu_inst_count
- 1] =
528 qpu_set_sig(c
->qpu_insts
[c
->qpu_inst_count
- 1],
529 QPU_SIG_SCOREBOARD_UNLOCK
);
533 if (vc4_debug
& VC4_DEBUG_QPU
)
536 vc4_qpu_validate(c
->qpu_insts
, c
->qpu_inst_count
);