2 * Copyright (C) 2018-2019 Alyssa Rosenzweig <alyssa@rosenzweig.io>
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 FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 #include <sys/types.h>
33 #include "main/mtypes.h"
34 #include "compiler/glsl/glsl_to_nir.h"
35 #include "compiler/nir_types.h"
36 #include "main/imports.h"
37 #include "compiler/nir/nir_builder.h"
38 #include "util/half_float.h"
39 #include "util/u_math.h"
40 #include "util/u_debug.h"
41 #include "util/u_dynarray.h"
42 #include "util/list.h"
43 #include "main/mtypes.h"
46 #include "midgard_nir.h"
47 #include "midgard_compile.h"
48 #include "midgard_ops.h"
52 #include "disassemble.h"
54 static const struct debug_named_value debug_options
[] = {
55 {"msgs", MIDGARD_DBG_MSGS
, "Print debug messages"},
56 {"shaders", MIDGARD_DBG_SHADERS
, "Dump shaders in NIR and MIR"},
57 {"shaderdb", MIDGARD_DBG_SHADERDB
, "Prints shader-db statistics"},
61 DEBUG_GET_ONCE_FLAGS_OPTION(midgard_debug
, "MIDGARD_MESA_DEBUG", debug_options
, 0)
63 unsigned SHADER_DB_COUNT
= 0;
65 int midgard_debug
= 0;
67 #define DBG(fmt, ...) \
68 do { if (midgard_debug & MIDGARD_DBG_MSGS) \
69 fprintf(stderr, "%s:%d: "fmt, \
70 __FUNCTION__, __LINE__, ##__VA_ARGS__); } while (0)
73 midgard_is_branch_unit(unsigned unit
)
75 return (unit
== ALU_ENAB_BRANCH
) || (unit
== ALU_ENAB_BR_COMPACT
);
79 midgard_block_add_successor(midgard_block
*block
, midgard_block
*successor
)
85 for (unsigned i
= 0; i
< block
->nr_successors
; ++i
) {
86 if (block
->successors
[i
] == successor
)
90 block
->successors
[block
->nr_successors
++] = successor
;
91 assert(block
->nr_successors
<= ARRAY_SIZE(block
->successors
));
93 /* Note the predecessor in the other direction */
94 _mesa_set_add(successor
->predecessors
, block
);
97 /* Helpers to generate midgard_instruction's using macro magic, since every
98 * driver seems to do it that way */
100 #define EMIT(op, ...) emit_mir_instruction(ctx, v_##op(__VA_ARGS__));
102 #define M_LOAD_STORE(name, store) \
103 static midgard_instruction m_##name(unsigned ssa, unsigned address) { \
104 midgard_instruction i = { \
105 .type = TAG_LOAD_STORE_4, \
109 .src = { -1, -1, -1 }, \
112 .op = midgard_op_##name, \
113 .swizzle = SWIZZLE_XYZW, \
119 i.ssa_args.src[0] = ssa; \
121 i.ssa_args.dest = ssa; \
126 #define M_LOAD(name) M_LOAD_STORE(name, false)
127 #define M_STORE(name) M_LOAD_STORE(name, true)
129 /* Inputs a NIR ALU source, with modifiers attached if necessary, and outputs
130 * the corresponding Midgard source */
132 static midgard_vector_alu_src
133 vector_alu_modifiers(nir_alu_src
*src
, bool is_int
, unsigned broadcast_count
,
134 bool half
, bool sext
)
136 if (!src
) return blank_alu_src
;
138 /* Figure out how many components there are so we can adjust the
139 * swizzle. Specifically we want to broadcast the last channel so
140 * things like ball2/3 work
143 if (broadcast_count
) {
144 uint8_t last_component
= src
->swizzle
[broadcast_count
- 1];
146 for (unsigned c
= broadcast_count
; c
< NIR_MAX_VEC_COMPONENTS
; ++c
) {
147 src
->swizzle
[c
] = last_component
;
151 midgard_vector_alu_src alu_src
= {
155 .swizzle
= SWIZZLE_FROM_ARRAY(src
->swizzle
)
159 alu_src
.mod
= midgard_int_normal
;
161 /* Sign/zero-extend if needed */
165 midgard_int_sign_extend
166 : midgard_int_zero_extend
;
169 /* These should have been lowered away */
170 assert(!(src
->abs
|| src
->negate
));
172 alu_src
.mod
= (src
->abs
<< 0) | (src
->negate
<< 1);
178 /* load/store instructions have both 32-bit and 16-bit variants, depending on
179 * whether we are using vectors composed of highp or mediump. At the moment, we
180 * don't support half-floats -- this requires changes in other parts of the
181 * compiler -- therefore the 16-bit versions are commented out. */
183 //M_LOAD(ld_attr_16);
185 //M_LOAD(ld_vary_16);
190 M_LOAD(ld_color_buffer_8
);
191 //M_STORE(st_vary_16);
193 M_LOAD(st_cubemap_coords
);
194 M_LOAD(ld_compute_id
);
196 static midgard_instruction
197 v_alu_br_compact_cond(midgard_jmp_writeout_op op
, unsigned tag
, signed offset
, unsigned cond
)
199 midgard_branch_cond branch
= {
207 memcpy(&compact
, &branch
, sizeof(branch
));
209 midgard_instruction ins
= {
211 .unit
= ALU_ENAB_BR_COMPACT
,
212 .prepacked_branch
= true,
213 .compact_branch
= true,
214 .br_compact
= compact
,
217 .src
= { -1, -1, -1 },
221 if (op
== midgard_jmp_writeout_op_writeout
)
227 static midgard_instruction
228 v_branch(bool conditional
, bool invert
)
230 midgard_instruction ins
= {
232 .unit
= ALU_ENAB_BRANCH
,
233 .compact_branch
= true,
235 .conditional
= conditional
,
236 .invert_conditional
= invert
240 .src
= { -1, -1, -1 },
247 static midgard_branch_extended
248 midgard_create_branch_extended( midgard_condition cond
,
249 midgard_jmp_writeout_op op
,
251 signed quadword_offset
)
253 /* The condition code is actually a LUT describing a function to
254 * combine multiple condition codes. However, we only support a single
255 * condition code at the moment, so we just duplicate over a bunch of
258 uint16_t duplicated_cond
=
268 midgard_branch_extended branch
= {
270 .dest_tag
= dest_tag
,
271 .offset
= quadword_offset
,
272 .cond
= duplicated_cond
279 attach_constants(compiler_context
*ctx
, midgard_instruction
*ins
, void *constants
, int name
)
281 ins
->has_constants
= true;
282 memcpy(&ins
->constants
, constants
, 16);
286 glsl_type_size(const struct glsl_type
*type
, bool bindless
)
288 return glsl_count_attribute_slots(type
, false);
291 /* Lower fdot2 to a vector multiplication followed by channel addition */
293 midgard_nir_lower_fdot2_body(nir_builder
*b
, nir_alu_instr
*alu
)
295 if (alu
->op
!= nir_op_fdot2
)
298 b
->cursor
= nir_before_instr(&alu
->instr
);
300 nir_ssa_def
*src0
= nir_ssa_for_alu_src(b
, alu
, 0);
301 nir_ssa_def
*src1
= nir_ssa_for_alu_src(b
, alu
, 1);
303 nir_ssa_def
*product
= nir_fmul(b
, src0
, src1
);
305 nir_ssa_def
*sum
= nir_fadd(b
,
306 nir_channel(b
, product
, 0),
307 nir_channel(b
, product
, 1));
309 /* Replace the fdot2 with this sum */
310 nir_ssa_def_rewrite_uses(&alu
->dest
.dest
.ssa
, nir_src_for_ssa(sum
));
314 midgard_sysval_for_ssbo(nir_intrinsic_instr
*instr
)
316 /* This is way too meta */
317 bool is_store
= instr
->intrinsic
== nir_intrinsic_store_ssbo
;
318 unsigned idx_idx
= is_store
? 1 : 0;
320 nir_src index
= instr
->src
[idx_idx
];
321 assert(nir_src_is_const(index
));
322 uint32_t uindex
= nir_src_as_uint(index
);
324 return PAN_SYSVAL(SSBO
, uindex
);
328 midgard_nir_sysval_for_intrinsic(nir_intrinsic_instr
*instr
)
330 switch (instr
->intrinsic
) {
331 case nir_intrinsic_load_viewport_scale
:
332 return PAN_SYSVAL_VIEWPORT_SCALE
;
333 case nir_intrinsic_load_viewport_offset
:
334 return PAN_SYSVAL_VIEWPORT_OFFSET
;
335 case nir_intrinsic_load_num_work_groups
:
336 return PAN_SYSVAL_NUM_WORK_GROUPS
;
337 case nir_intrinsic_load_ssbo
:
338 case nir_intrinsic_store_ssbo
:
339 return midgard_sysval_for_ssbo(instr
);
345 static int sysval_for_instr(compiler_context
*ctx
, nir_instr
*instr
,
348 nir_intrinsic_instr
*intr
;
349 nir_dest
*dst
= NULL
;
353 bool is_store
= false;
355 switch (instr
->type
) {
356 case nir_instr_type_intrinsic
:
357 intr
= nir_instr_as_intrinsic(instr
);
358 sysval
= midgard_nir_sysval_for_intrinsic(intr
);
360 is_store
|= intr
->intrinsic
== nir_intrinsic_store_ssbo
;
362 case nir_instr_type_tex
:
363 tex
= nir_instr_as_tex(instr
);
364 if (tex
->op
!= nir_texop_txs
)
367 sysval
= PAN_SYSVAL(TEXTURE_SIZE
,
368 PAN_TXS_SYSVAL_ID(tex
->texture_index
,
369 nir_tex_instr_dest_size(tex
) -
370 (tex
->is_array
? 1 : 0),
378 if (dest
&& dst
&& !is_store
)
379 *dest
= nir_dest_index(ctx
, dst
);
385 midgard_nir_assign_sysval_body(compiler_context
*ctx
, nir_instr
*instr
)
389 sysval
= sysval_for_instr(ctx
, instr
, NULL
);
393 /* We have a sysval load; check if it's already been assigned */
395 if (_mesa_hash_table_u64_search(ctx
->sysval_to_id
, sysval
))
398 /* It hasn't -- so assign it now! */
400 unsigned id
= ctx
->sysval_count
++;
401 _mesa_hash_table_u64_insert(ctx
->sysval_to_id
, sysval
, (void *) ((uintptr_t) id
+ 1));
402 ctx
->sysvals
[id
] = sysval
;
406 midgard_nir_assign_sysvals(compiler_context
*ctx
, nir_shader
*shader
)
408 ctx
->sysval_count
= 0;
410 nir_foreach_function(function
, shader
) {
411 if (!function
->impl
) continue;
413 nir_foreach_block(block
, function
->impl
) {
414 nir_foreach_instr_safe(instr
, block
) {
415 midgard_nir_assign_sysval_body(ctx
, instr
);
422 midgard_nir_lower_fdot2(nir_shader
*shader
)
424 bool progress
= false;
426 nir_foreach_function(function
, shader
) {
427 if (!function
->impl
) continue;
430 nir_builder
*b
= &_b
;
431 nir_builder_init(b
, function
->impl
);
433 nir_foreach_block(block
, function
->impl
) {
434 nir_foreach_instr_safe(instr
, block
) {
435 if (instr
->type
!= nir_instr_type_alu
) continue;
437 nir_alu_instr
*alu
= nir_instr_as_alu(instr
);
438 midgard_nir_lower_fdot2_body(b
, alu
);
444 nir_metadata_preserve(function
->impl
, nir_metadata_block_index
| nir_metadata_dominance
);
451 /* Flushes undefined values to zero */
454 optimise_nir(nir_shader
*nir
)
457 unsigned lower_flrp
=
458 (nir
->options
->lower_flrp16
? 16 : 0) |
459 (nir
->options
->lower_flrp32
? 32 : 0) |
460 (nir
->options
->lower_flrp64
? 64 : 0);
462 NIR_PASS(progress
, nir
, nir_lower_regs_to_ssa
);
463 NIR_PASS(progress
, nir
, midgard_nir_lower_fdot2
);
464 NIR_PASS(progress
, nir
, nir_lower_idiv
);
466 nir_lower_tex_options lower_tex_options
= {
467 .lower_txs_lod
= true,
471 NIR_PASS(progress
, nir
, nir_lower_tex
, &lower_tex_options
);
476 NIR_PASS(progress
, nir
, nir_lower_var_copies
);
477 NIR_PASS(progress
, nir
, nir_lower_vars_to_ssa
);
479 NIR_PASS(progress
, nir
, nir_copy_prop
);
480 NIR_PASS(progress
, nir
, nir_opt_dce
);
481 NIR_PASS(progress
, nir
, nir_opt_dead_cf
);
482 NIR_PASS(progress
, nir
, nir_opt_cse
);
483 NIR_PASS(progress
, nir
, nir_opt_peephole_select
, 64, false, true);
484 NIR_PASS(progress
, nir
, nir_opt_algebraic
);
485 NIR_PASS(progress
, nir
, nir_opt_constant_folding
);
487 if (lower_flrp
!= 0) {
488 bool lower_flrp_progress
= false;
489 NIR_PASS(lower_flrp_progress
,
493 false /* always_precise */,
494 nir
->options
->lower_ffma
);
495 if (lower_flrp_progress
) {
496 NIR_PASS(progress
, nir
,
497 nir_opt_constant_folding
);
501 /* Nothing should rematerialize any flrps, so we only
502 * need to do this lowering once.
507 NIR_PASS(progress
, nir
, nir_opt_undef
);
508 NIR_PASS(progress
, nir
, nir_undef_to_zero
);
510 NIR_PASS(progress
, nir
, nir_opt_loop_unroll
,
513 nir_var_function_temp
);
515 NIR_PASS(progress
, nir
, nir_opt_vectorize
);
518 /* Must be run at the end to prevent creation of fsin/fcos ops */
519 NIR_PASS(progress
, nir
, midgard_nir_scale_trig
);
524 NIR_PASS(progress
, nir
, nir_opt_dce
);
525 NIR_PASS(progress
, nir
, nir_opt_algebraic
);
526 NIR_PASS(progress
, nir
, nir_opt_constant_folding
);
527 NIR_PASS(progress
, nir
, nir_copy_prop
);
530 NIR_PASS(progress
, nir
, nir_opt_algebraic_late
);
532 /* We implement booleans as 32-bit 0/~0 */
533 NIR_PASS(progress
, nir
, nir_lower_bool_to_int32
);
535 /* Now that booleans are lowered, we can run out late opts */
536 NIR_PASS(progress
, nir
, midgard_nir_lower_algebraic_late
);
538 /* Lower mods for float ops only. Integer ops don't support modifiers
539 * (saturate doesn't make sense on integers, neg/abs require dedicated
542 NIR_PASS(progress
, nir
, nir_lower_to_source_mods
, nir_lower_float_source_mods
);
543 NIR_PASS(progress
, nir
, nir_copy_prop
);
544 NIR_PASS(progress
, nir
, nir_opt_dce
);
546 /* Take us out of SSA */
547 NIR_PASS(progress
, nir
, nir_lower_locals_to_regs
);
548 NIR_PASS(progress
, nir
, nir_convert_from_ssa
, true);
550 /* We are a vector architecture; write combine where possible */
551 NIR_PASS(progress
, nir
, nir_move_vec_src_uses_to_dest
);
552 NIR_PASS(progress
, nir
, nir_lower_vec_to_movs
);
554 NIR_PASS(progress
, nir
, nir_opt_dce
);
557 /* Do not actually emit a load; instead, cache the constant for inlining */
560 emit_load_const(compiler_context
*ctx
, nir_load_const_instr
*instr
)
562 nir_ssa_def def
= instr
->def
;
564 float *v
= rzalloc_array(NULL
, float, 4);
565 nir_const_load_to_arr(v
, instr
, f32
);
567 /* Shifted for SSA, +1 for off-by-one */
568 _mesa_hash_table_u64_insert(ctx
->ssa_constants
, (def
.index
<< 1) + 1, v
);
571 /* Normally constants are embedded implicitly, but for I/O and such we have to
572 * explicitly emit a move with the constant source */
575 emit_explicit_constant(compiler_context
*ctx
, unsigned node
, unsigned to
)
577 void *constant_value
= _mesa_hash_table_u64_search(ctx
->ssa_constants
, node
+ 1);
579 if (constant_value
) {
580 midgard_instruction ins
= v_mov(SSA_FIXED_REGISTER(REGISTER_CONSTANT
), blank_alu_src
, to
);
581 attach_constants(ctx
, &ins
, constant_value
, node
+ 1);
582 emit_mir_instruction(ctx
, ins
);
587 nir_is_non_scalar_swizzle(nir_alu_src
*src
, unsigned nr_components
)
589 unsigned comp
= src
->swizzle
[0];
591 for (unsigned c
= 1; c
< nr_components
; ++c
) {
592 if (src
->swizzle
[c
] != comp
)
599 /* Midgard puts scalar conditionals in r31.w; move an arbitrary source (the
600 * output of a conditional test) into that register */
603 emit_condition(compiler_context
*ctx
, nir_src
*src
, bool for_branch
, unsigned component
)
605 int condition
= nir_src_index(ctx
, src
);
607 /* Source to swizzle the desired component into w */
609 const midgard_vector_alu_src alu_src
= {
610 .swizzle
= SWIZZLE(component
, component
, component
, component
),
613 /* There is no boolean move instruction. Instead, we simulate a move by
614 * ANDing the condition with itself to get it into r31.w */
616 midgard_instruction ins
= {
619 /* We need to set the conditional as close as possible */
620 .precede_break
= true,
621 .unit
= for_branch
? UNIT_SMUL
: UNIT_SADD
,
622 .mask
= 1 << COMPONENT_W
,
625 .src
= { condition
, condition
, -1 },
626 .dest
= SSA_FIXED_REGISTER(31),
630 .op
= midgard_alu_op_iand
,
631 .outmod
= midgard_outmod_int_wrap
,
632 .reg_mode
= midgard_reg_mode_32
,
633 .dest_override
= midgard_dest_override_none
,
634 .src1
= vector_alu_srco_unsigned(alu_src
),
635 .src2
= vector_alu_srco_unsigned(alu_src
)
639 emit_mir_instruction(ctx
, ins
);
642 /* Or, for mixed conditions (with csel_v), here's a vector version using all of
646 emit_condition_mixed(compiler_context
*ctx
, nir_alu_src
*src
, unsigned nr_comp
)
648 int condition
= nir_src_index(ctx
, &src
->src
);
650 /* Source to swizzle the desired component into w */
652 const midgard_vector_alu_src alu_src
= {
653 .swizzle
= SWIZZLE_FROM_ARRAY(src
->swizzle
),
656 /* There is no boolean move instruction. Instead, we simulate a move by
657 * ANDing the condition with itself to get it into r31.w */
659 midgard_instruction ins
= {
661 .precede_break
= true,
662 .mask
= mask_of(nr_comp
),
664 .src
= { condition
, condition
, -1 },
665 .dest
= SSA_FIXED_REGISTER(31),
668 .op
= midgard_alu_op_iand
,
669 .outmod
= midgard_outmod_int_wrap
,
670 .reg_mode
= midgard_reg_mode_32
,
671 .dest_override
= midgard_dest_override_none
,
672 .src1
= vector_alu_srco_unsigned(alu_src
),
673 .src2
= vector_alu_srco_unsigned(alu_src
)
677 emit_mir_instruction(ctx
, ins
);
680 #define ALU_CASE(nir, _op) \
682 op = midgard_alu_op_##_op; \
683 assert(src_bitsize == dst_bitsize); \
686 #define ALU_CASE_BCAST(nir, _op, count) \
688 op = midgard_alu_op_##_op; \
689 broadcast_swizzle = count; \
690 assert(src_bitsize == dst_bitsize); \
693 nir_is_fzero_constant(nir_src src
)
695 if (!nir_src_is_const(src
))
698 for (unsigned c
= 0; c
< nir_src_num_components(src
); ++c
) {
699 if (nir_src_comp_as_float(src
, c
) != 0.0)
706 /* Analyze the sizes of the inputs to determine which reg mode. Ops needed
707 * special treatment override this anyway. */
709 static midgard_reg_mode
710 reg_mode_for_nir(nir_alu_instr
*instr
)
712 unsigned src_bitsize
= nir_src_bit_size(instr
->src
[0].src
);
714 switch (src_bitsize
) {
716 return midgard_reg_mode_8
;
718 return midgard_reg_mode_16
;
720 return midgard_reg_mode_32
;
722 return midgard_reg_mode_64
;
724 unreachable("Invalid bit size");
729 emit_alu(compiler_context
*ctx
, nir_alu_instr
*instr
)
731 /* Derivatives end up emitted on the texture pipe, not the ALUs. This
732 * is handled elsewhere */
734 if (instr
->op
== nir_op_fddx
|| instr
->op
== nir_op_fddy
) {
735 midgard_emit_derivatives(ctx
, instr
);
739 bool is_ssa
= instr
->dest
.dest
.is_ssa
;
741 unsigned dest
= nir_dest_index(ctx
, &instr
->dest
.dest
);
742 unsigned nr_components
= nir_dest_num_components(instr
->dest
.dest
);
743 unsigned nr_inputs
= nir_op_infos
[instr
->op
].num_inputs
;
745 /* Most Midgard ALU ops have a 1:1 correspondance to NIR ops; these are
746 * supported. A few do not and are commented for now. Also, there are a
747 * number of NIR ops which Midgard does not support and need to be
748 * lowered, also TODO. This switch block emits the opcode and calling
749 * convention of the Midgard instruction; actual packing is done in
754 /* Number of components valid to check for the instruction (the rest
755 * will be forced to the last), or 0 to use as-is. Relevant as
756 * ball-type instructions have a channel count in NIR but are all vec4
759 unsigned broadcast_swizzle
= 0;
761 /* What register mode should we operate in? */
762 midgard_reg_mode reg_mode
=
763 reg_mode_for_nir(instr
);
765 /* Do we need a destination override? Used for inline
768 midgard_dest_override dest_override
=
769 midgard_dest_override_none
;
771 /* Should we use a smaller respective source and sign-extend? */
773 bool half_1
= false, sext_1
= false;
774 bool half_2
= false, sext_2
= false;
776 unsigned src_bitsize
= nir_src_bit_size(instr
->src
[0].src
);
777 unsigned dst_bitsize
= nir_dest_bit_size(instr
->dest
.dest
);
780 ALU_CASE(fadd
, fadd
);
781 ALU_CASE(fmul
, fmul
);
782 ALU_CASE(fmin
, fmin
);
783 ALU_CASE(fmax
, fmax
);
784 ALU_CASE(imin
, imin
);
785 ALU_CASE(imax
, imax
);
786 ALU_CASE(umin
, umin
);
787 ALU_CASE(umax
, umax
);
788 ALU_CASE(ffloor
, ffloor
);
789 ALU_CASE(fround_even
, froundeven
);
790 ALU_CASE(ftrunc
, ftrunc
);
791 ALU_CASE(fceil
, fceil
);
792 ALU_CASE(fdot3
, fdot3
);
793 ALU_CASE(fdot4
, fdot4
);
794 ALU_CASE(iadd
, iadd
);
795 ALU_CASE(isub
, isub
);
796 ALU_CASE(imul
, imul
);
798 /* Zero shoved as second-arg */
799 ALU_CASE(iabs
, iabsdiff
);
803 ALU_CASE(feq32
, feq
);
804 ALU_CASE(fne32
, fne
);
805 ALU_CASE(flt32
, flt
);
806 ALU_CASE(ieq32
, ieq
);
807 ALU_CASE(ine32
, ine
);
808 ALU_CASE(ilt32
, ilt
);
809 ALU_CASE(ult32
, ult
);
811 /* We don't have a native b2f32 instruction. Instead, like many
812 * GPUs, we exploit booleans as 0/~0 for false/true, and
813 * correspondingly AND
814 * by 1.0 to do the type conversion. For the moment, prime us
817 * iand [whatever], #0
819 * At the end of emit_alu (as MIR), we'll fix-up the constant
822 ALU_CASE(b2f32
, iand
);
823 ALU_CASE(b2i32
, iand
);
825 /* Likewise, we don't have a dedicated f2b32 instruction, but
826 * we can do a "not equal to 0.0" test. */
828 ALU_CASE(f2b32
, fne
);
829 ALU_CASE(i2b32
, ine
);
831 ALU_CASE(frcp
, frcp
);
832 ALU_CASE(frsq
, frsqrt
);
833 ALU_CASE(fsqrt
, fsqrt
);
834 ALU_CASE(fexp2
, fexp2
);
835 ALU_CASE(flog2
, flog2
);
837 ALU_CASE(f2i32
, f2i_rtz
);
838 ALU_CASE(f2u32
, f2u_rtz
);
839 ALU_CASE(i2f32
, i2f_rtz
);
840 ALU_CASE(u2f32
, u2f_rtz
);
842 ALU_CASE(f2i16
, f2i_rtz
);
843 ALU_CASE(f2u16
, f2u_rtz
);
844 ALU_CASE(i2f16
, i2f_rtz
);
845 ALU_CASE(u2f16
, u2f_rtz
);
847 ALU_CASE(fsin
, fsin
);
848 ALU_CASE(fcos
, fcos
);
850 /* We'll set invert */
851 ALU_CASE(inot
, imov
);
852 ALU_CASE(iand
, iand
);
854 ALU_CASE(ixor
, ixor
);
855 ALU_CASE(ishl
, ishl
);
856 ALU_CASE(ishr
, iasr
);
857 ALU_CASE(ushr
, ilsr
);
859 ALU_CASE_BCAST(b32all_fequal2
, fball_eq
, 2);
860 ALU_CASE_BCAST(b32all_fequal3
, fball_eq
, 3);
861 ALU_CASE(b32all_fequal4
, fball_eq
);
863 ALU_CASE_BCAST(b32any_fnequal2
, fbany_neq
, 2);
864 ALU_CASE_BCAST(b32any_fnequal3
, fbany_neq
, 3);
865 ALU_CASE(b32any_fnequal4
, fbany_neq
);
867 ALU_CASE_BCAST(b32all_iequal2
, iball_eq
, 2);
868 ALU_CASE_BCAST(b32all_iequal3
, iball_eq
, 3);
869 ALU_CASE(b32all_iequal4
, iball_eq
);
871 ALU_CASE_BCAST(b32any_inequal2
, ibany_neq
, 2);
872 ALU_CASE_BCAST(b32any_inequal3
, ibany_neq
, 3);
873 ALU_CASE(b32any_inequal4
, ibany_neq
);
875 /* Source mods will be shoved in later */
876 ALU_CASE(fabs
, fmov
);
877 ALU_CASE(fneg
, fmov
);
878 ALU_CASE(fsat
, fmov
);
880 /* For size conversion, we use a move. Ideally though we would squash
881 * these ops together; maybe that has to happen after in NIR as part of
882 * propagation...? An earlier algebraic pass ensured we step down by
883 * only / exactly one size. If stepping down, we use a dest override to
884 * reduce the size; if stepping up, we use a larger-sized move with a
885 * half source and a sign/zero-extension modifier */
890 /* If we end up upscale, we'll need a sign-extend on the
891 * operand (the second argument) */
897 op
= midgard_alu_op_imov
;
899 if (dst_bitsize
== (src_bitsize
* 2)) {
903 /* Use a greater register mode */
905 } else if (src_bitsize
== (dst_bitsize
* 2)) {
906 /* Converting down */
907 dest_override
= midgard_dest_override_lower
;
914 assert(src_bitsize
== 32);
916 op
= midgard_alu_op_fmov
;
917 dest_override
= midgard_dest_override_lower
;
922 assert(src_bitsize
== 16);
924 op
= midgard_alu_op_fmov
;
931 /* For greater-or-equal, we lower to less-or-equal and flip the
939 instr
->op
== nir_op_fge
? midgard_alu_op_fle
:
940 instr
->op
== nir_op_fge32
? midgard_alu_op_fle
:
941 instr
->op
== nir_op_ige32
? midgard_alu_op_ile
:
942 instr
->op
== nir_op_uge32
? midgard_alu_op_ule
:
945 /* Swap via temporary */
946 nir_alu_src temp
= instr
->src
[1];
947 instr
->src
[1] = instr
->src
[0];
948 instr
->src
[0] = temp
;
953 case nir_op_b32csel
: {
954 /* Midgard features both fcsel and icsel, depending on
955 * the type of the arguments/output. However, as long
956 * as we're careful we can _always_ use icsel and
957 * _never_ need fcsel, since the latter does additional
958 * floating-point-specific processing whereas the
959 * former just moves bits on the wire. It's not obvious
960 * why these are separate opcodes, save for the ability
961 * to do things like sat/pos/abs/neg for free */
963 bool mixed
= nir_is_non_scalar_swizzle(&instr
->src
[0], nr_components
);
964 op
= mixed
? midgard_alu_op_icsel_v
: midgard_alu_op_icsel
;
966 /* csel works as a two-arg in Midgard, since the condition is hardcoded in r31.w */
969 /* Emit the condition into r31 */
972 emit_condition_mixed(ctx
, &instr
->src
[0], nr_components
);
974 emit_condition(ctx
, &instr
->src
[0].src
, false, instr
->src
[0].swizzle
[0]);
976 /* The condition is the first argument; move the other
977 * arguments up one to be a binary instruction for
980 memmove(instr
->src
, instr
->src
+ 1, 2 * sizeof(nir_alu_src
));
985 DBG("Unhandled ALU op %s\n", nir_op_infos
[instr
->op
].name
);
990 /* Midgard can perform certain modifiers on output of an ALU op */
993 if (midgard_is_integer_out_op(op
)) {
994 outmod
= midgard_outmod_int_wrap
;
996 bool sat
= instr
->dest
.saturate
|| instr
->op
== nir_op_fsat
;
997 outmod
= sat
? midgard_outmod_sat
: midgard_outmod_none
;
1000 /* fmax(a, 0.0) can turn into a .pos modifier as an optimization */
1002 if (instr
->op
== nir_op_fmax
) {
1003 if (nir_is_fzero_constant(instr
->src
[0].src
)) {
1004 op
= midgard_alu_op_fmov
;
1006 outmod
= midgard_outmod_pos
;
1007 instr
->src
[0] = instr
->src
[1];
1008 } else if (nir_is_fzero_constant(instr
->src
[1].src
)) {
1009 op
= midgard_alu_op_fmov
;
1011 outmod
= midgard_outmod_pos
;
1015 /* Fetch unit, quirks, etc information */
1016 unsigned opcode_props
= alu_opcode_props
[op
].props
;
1017 bool quirk_flipped_r24
= opcode_props
& QUIRK_FLIPPED_R24
;
1019 /* src0 will always exist afaik, but src1 will not for 1-argument
1020 * instructions. The latter can only be fetched if the instruction
1021 * needs it, or else we may segfault. */
1023 unsigned src0
= nir_alu_src_index(ctx
, &instr
->src
[0]);
1024 unsigned src1
= nr_inputs
== 2 ? nir_alu_src_index(ctx
, &instr
->src
[1]) : SSA_UNUSED_0
;
1026 /* Rather than use the instruction generation helpers, we do it
1027 * ourselves here to avoid the mess */
1029 midgard_instruction ins
= {
1033 quirk_flipped_r24
? SSA_UNUSED_1
: src0
,
1034 quirk_flipped_r24
? src0
: src1
,
1041 nir_alu_src
*nirmods
[2] = { NULL
};
1043 if (nr_inputs
== 2) {
1044 nirmods
[0] = &instr
->src
[0];
1045 nirmods
[1] = &instr
->src
[1];
1046 } else if (nr_inputs
== 1) {
1047 nirmods
[quirk_flipped_r24
] = &instr
->src
[0];
1052 /* These were lowered to a move, so apply the corresponding mod */
1054 if (instr
->op
== nir_op_fneg
|| instr
->op
== nir_op_fabs
) {
1055 nir_alu_src
*s
= nirmods
[quirk_flipped_r24
];
1057 if (instr
->op
== nir_op_fneg
)
1058 s
->negate
= !s
->negate
;
1060 if (instr
->op
== nir_op_fabs
)
1064 bool is_int
= midgard_is_integer_op(op
);
1066 ins
.mask
= mask_of(nr_components
);
1068 midgard_vector_alu alu
= {
1070 .reg_mode
= reg_mode
,
1071 .dest_override
= dest_override
,
1074 .src1
= vector_alu_srco_unsigned(vector_alu_modifiers(nirmods
[0], is_int
, broadcast_swizzle
, half_1
, sext_1
)),
1075 .src2
= vector_alu_srco_unsigned(vector_alu_modifiers(nirmods
[1], is_int
, broadcast_swizzle
, half_2
, sext_2
)),
1078 /* Apply writemask if non-SSA, keeping in mind that we can't write to components that don't exist */
1081 ins
.mask
&= instr
->dest
.write_mask
;
1085 /* Late fixup for emulated instructions */
1087 if (instr
->op
== nir_op_b2f32
|| instr
->op
== nir_op_b2i32
) {
1088 /* Presently, our second argument is an inline #0 constant.
1089 * Switch over to an embedded 1.0 constant (that can't fit
1090 * inline, since we're 32-bit, not 16-bit like the inline
1093 ins
.ssa_args
.inline_constant
= false;
1094 ins
.ssa_args
.src
[1] = SSA_FIXED_REGISTER(REGISTER_CONSTANT
);
1095 ins
.has_constants
= true;
1097 if (instr
->op
== nir_op_b2f32
) {
1098 ins
.constants
[0] = 1.0f
;
1100 /* Type pun it into place */
1102 memcpy(&ins
.constants
[0], &one
, sizeof(uint32_t));
1105 ins
.alu
.src2
= vector_alu_srco_unsigned(blank_alu_src_xxxx
);
1106 } else if (nr_inputs
== 1 && !quirk_flipped_r24
) {
1107 /* Lots of instructions need a 0 plonked in */
1108 ins
.ssa_args
.inline_constant
= false;
1109 ins
.ssa_args
.src
[1] = SSA_FIXED_REGISTER(REGISTER_CONSTANT
);
1110 ins
.has_constants
= true;
1111 ins
.constants
[0] = 0.0f
;
1112 ins
.alu
.src2
= vector_alu_srco_unsigned(blank_alu_src_xxxx
);
1113 } else if (instr
->op
== nir_op_inot
) {
1117 if ((opcode_props
& UNITS_ALL
) == UNIT_VLUT
) {
1118 /* To avoid duplicating the lookup tables (probably), true LUT
1119 * instructions can only operate as if they were scalars. Lower
1120 * them here by changing the component. */
1122 uint8_t original_swizzle
[4];
1123 memcpy(original_swizzle
, nirmods
[0]->swizzle
, sizeof(nirmods
[0]->swizzle
));
1124 unsigned orig_mask
= ins
.mask
;
1126 for (int i
= 0; i
< nr_components
; ++i
) {
1127 /* Mask the associated component, dropping the
1128 * instruction if needed */
1131 ins
.mask
&= orig_mask
;
1136 for (int j
= 0; j
< 4; ++j
)
1137 nirmods
[0]->swizzle
[j
] = original_swizzle
[i
]; /* Pull from the correct component */
1139 ins
.alu
.src1
= vector_alu_srco_unsigned(vector_alu_modifiers(nirmods
[0], is_int
, broadcast_swizzle
, half_1
, false));
1140 emit_mir_instruction(ctx
, ins
);
1143 emit_mir_instruction(ctx
, ins
);
1150 mir_mask_for_intr(nir_instr
*instr
, bool is_read
)
1152 nir_intrinsic_instr
*intr
= nir_instr_as_intrinsic(instr
);
1155 return mask_of(nir_intrinsic_dest_components(intr
));
1157 return nir_intrinsic_write_mask(intr
);
1160 /* Uniforms and UBOs use a shared code path, as uniforms are just (slightly
1161 * optimized) versions of UBO #0 */
1163 midgard_instruction
*
1165 compiler_context
*ctx
,
1169 nir_src
*indirect_offset
,
1172 /* TODO: half-floats */
1174 midgard_instruction ins
= m_ld_ubo_int4(dest
, offset
);
1176 assert((offset
& 0xF) == 0);
1179 /* TODO: Don't split */
1180 ins
.load_store
.varying_parameters
= (offset
& 7) << 7;
1181 ins
.load_store
.address
= offset
>> 3;
1182 ins
.mask
= mir_mask_for_intr(instr
, true);
1184 if (indirect_offset
) {
1185 ins
.ssa_args
.src
[1] = nir_src_index(ctx
, indirect_offset
);
1186 ins
.load_store
.arg_2
= 0x80;
1188 ins
.load_store
.arg_2
= 0x1E;
1191 ins
.load_store
.arg_1
= index
;
1193 return emit_mir_instruction(ctx
, ins
);
1196 /* SSBO reads are like UBO reads if you squint */
1200 compiler_context
*ctx
,
1205 nir_src
*indirect_offset
,
1210 midgard_instruction ins
;
1213 ins
= m_ld_int4(srcdest
, offset
);
1215 ins
= m_st_int4(srcdest
, offset
);
1217 /* SSBO reads use a generic memory read interface, so we need the
1218 * address of the SSBO as the first argument. This is a sysval. */
1220 unsigned addr
= make_compiler_temp(ctx
);
1221 emit_sysval_read(ctx
, instr
, addr
, 2);
1223 /* The source array is a bit of a leaky abstraction for SSBOs.
1224 * Nevertheless, for loads:
1230 * Whereas for stores:
1236 * We would like arg_1 = the address and
1237 * arg_2 = the offset.
1240 ins
.ssa_args
.src
[is_read
? 0 : 1] = addr
;
1242 /* TODO: What is this? It looks superficially like a shift << 5, but
1243 * arg_1 doesn't take a shift Should it be E0 or A0? */
1244 if (indirect_offset
)
1245 ins
.load_store
.arg_1
|= 0xE0;
1247 /* We also need to emit the indirect offset */
1249 if (indirect_offset
)
1250 ins
.ssa_args
.src
[is_read
? 1 : 2] = nir_src_index(ctx
, indirect_offset
);
1252 ins
.load_store
.arg_2
= 0x7E;
1254 /* TODO: Bounds check */
1256 /* Finally, we emit the direct offset */
1258 ins
.load_store
.varying_parameters
= (offset
& 0x1FF) << 1;
1259 ins
.load_store
.address
= (offset
>> 9);
1260 ins
.mask
= mir_mask_for_intr(instr
, is_read
);
1262 emit_mir_instruction(ctx
, ins
);
1267 compiler_context
*ctx
,
1268 unsigned dest
, unsigned offset
,
1269 unsigned nr_comp
, unsigned component
,
1270 nir_src
*indirect_offset
, nir_alu_type type
)
1272 /* XXX: Half-floats? */
1273 /* TODO: swizzle, mask */
1275 midgard_instruction ins
= m_ld_vary_32(dest
, offset
);
1276 ins
.mask
= mask_of(nr_comp
);
1277 ins
.load_store
.swizzle
= SWIZZLE_XYZW
>> (2 * component
);
1279 midgard_varying_parameter p
= {
1281 .interpolation
= midgard_interp_default
,
1282 .flat
= /*var->data.interpolation == INTERP_MODE_FLAT*/ 0
1286 memcpy(&u
, &p
, sizeof(p
));
1287 ins
.load_store
.varying_parameters
= u
;
1289 if (indirect_offset
)
1290 ins
.ssa_args
.src
[1] = nir_src_index(ctx
, indirect_offset
);
1292 ins
.load_store
.arg_2
= 0x1E;
1294 ins
.load_store
.arg_1
= 0x9E;
1296 /* Use the type appropriate load */
1300 ins
.load_store
.op
= midgard_op_ld_vary_32u
;
1303 ins
.load_store
.op
= midgard_op_ld_vary_32i
;
1305 case nir_type_float
:
1306 ins
.load_store
.op
= midgard_op_ld_vary_32
;
1309 unreachable("Attempted to load unknown type");
1313 emit_mir_instruction(ctx
, ins
);
1317 emit_sysval_read(compiler_context
*ctx
, nir_instr
*instr
, signed dest_override
,
1318 unsigned nr_components
)
1322 /* Figure out which uniform this is */
1323 int sysval
= sysval_for_instr(ctx
, instr
, &dest
);
1324 void *val
= _mesa_hash_table_u64_search(ctx
->sysval_to_id
, sysval
);
1326 if (dest_override
>= 0)
1327 dest
= dest_override
;
1329 /* Sysvals are prefix uniforms */
1330 unsigned uniform
= ((uintptr_t) val
) - 1;
1332 /* Emit the read itself -- this is never indirect */
1333 midgard_instruction
*ins
=
1334 emit_ubo_read(ctx
, instr
, dest
, uniform
* 16, NULL
, 0);
1336 ins
->mask
= mask_of(nr_components
);
1340 compute_builtin_arg(nir_op op
)
1343 case nir_intrinsic_load_work_group_id
:
1345 case nir_intrinsic_load_local_invocation_id
:
1348 unreachable("Invalid compute paramater loaded");
1352 /* Emit store for a fragment shader, which is encoded via a fancy branch. TODO:
1353 * Handle MRT here */
1356 emit_fragment_store(compiler_context
*ctx
, unsigned src
, unsigned rt
)
1358 /* First, move in whatever we're outputting */
1359 midgard_instruction move
= v_mov(src
, blank_alu_src
, SSA_FIXED_REGISTER(0));
1361 /* Force a tight schedule. TODO: Make the scheduler MRT aware */
1362 move
.unit
= UNIT_VMUL
;
1363 move
.precede_break
= true;
1364 move
.dont_eliminate
= true;
1367 emit_mir_instruction(ctx
, move
);
1369 /* If we're doing MRT, we need to specify the render target */
1371 midgard_instruction rt_move
= {
1378 /* We'll write to r1.z */
1379 rt_move
= v_mov(-1, blank_alu_src
, SSA_FIXED_REGISTER(1));
1380 rt_move
.mask
= 1 << COMPONENT_Z
;
1381 rt_move
.unit
= UNIT_SADD
;
1383 /* r1.z = (rt * 0x100) */
1384 rt_move
.ssa_args
.inline_constant
= true;
1385 rt_move
.inline_constant
= (rt
* 0x100);
1388 ctx
->work_registers
= MAX2(ctx
->work_registers
, 1);
1391 emit_mir_instruction(ctx
, rt_move
);
1394 /* Next, generate the branch. For R render targets in the writeout, the
1395 * i'th render target jumps to pseudo-offset [2(R-1) + i] */
1397 unsigned offset
= (2 * (ctx
->nir
->num_outputs
- 1)) + rt
;
1399 struct midgard_instruction ins
=
1400 v_alu_br_compact_cond(midgard_jmp_writeout_op_writeout
, TAG_ALU_4
, offset
, midgard_condition_always
);
1402 /* Add dependencies */
1403 ins
.ssa_args
.src
[0] = move
.ssa_args
.dest
;
1404 ins
.ssa_args
.src
[1] = rt_move
.ssa_args
.dest
;
1406 /* Emit the branch */
1407 emit_mir_instruction(ctx
, ins
);
1411 emit_compute_builtin(compiler_context
*ctx
, nir_intrinsic_instr
*instr
)
1413 unsigned reg
= nir_dest_index(ctx
, &instr
->dest
);
1414 midgard_instruction ins
= m_ld_compute_id(reg
, 0);
1415 ins
.mask
= mask_of(3);
1416 ins
.load_store
.arg_1
= compute_builtin_arg(instr
->intrinsic
);
1417 emit_mir_instruction(ctx
, ins
);
1420 emit_intrinsic(compiler_context
*ctx
, nir_intrinsic_instr
*instr
)
1422 unsigned offset
= 0, reg
;
1424 switch (instr
->intrinsic
) {
1425 case nir_intrinsic_discard_if
:
1426 emit_condition(ctx
, &instr
->src
[0], true, COMPONENT_X
);
1430 case nir_intrinsic_discard
: {
1431 bool conditional
= instr
->intrinsic
== nir_intrinsic_discard_if
;
1432 struct midgard_instruction discard
= v_branch(conditional
, false);
1433 discard
.branch
.target_type
= TARGET_DISCARD
;
1434 emit_mir_instruction(ctx
, discard
);
1438 case nir_intrinsic_load_uniform
:
1439 case nir_intrinsic_load_ubo
:
1440 case nir_intrinsic_load_ssbo
:
1441 case nir_intrinsic_load_input
: {
1442 bool is_uniform
= instr
->intrinsic
== nir_intrinsic_load_uniform
;
1443 bool is_ubo
= instr
->intrinsic
== nir_intrinsic_load_ubo
;
1444 bool is_ssbo
= instr
->intrinsic
== nir_intrinsic_load_ssbo
;
1446 /* Get the base type of the intrinsic */
1447 /* TODO: Infer type? Does it matter? */
1449 (is_ubo
|| is_ssbo
) ? nir_type_uint
: nir_intrinsic_type(instr
);
1450 t
= nir_alu_type_get_base_type(t
);
1452 if (!(is_ubo
|| is_ssbo
)) {
1453 offset
= nir_intrinsic_base(instr
);
1456 unsigned nr_comp
= nir_intrinsic_dest_components(instr
);
1458 nir_src
*src_offset
= nir_get_io_offset_src(instr
);
1460 bool direct
= nir_src_is_const(*src_offset
);
1461 nir_src
*indirect_offset
= direct
? NULL
: src_offset
;
1464 offset
+= nir_src_as_uint(*src_offset
);
1466 /* We may need to apply a fractional offset */
1467 int component
= instr
->intrinsic
== nir_intrinsic_load_input
?
1468 nir_intrinsic_component(instr
) : 0;
1469 reg
= nir_dest_index(ctx
, &instr
->dest
);
1471 if (is_uniform
&& !ctx
->is_blend
) {
1472 emit_ubo_read(ctx
, &instr
->instr
, reg
, (ctx
->sysval_count
+ offset
) * 16, indirect_offset
, 0);
1473 } else if (is_ubo
) {
1474 nir_src index
= instr
->src
[0];
1476 /* We don't yet support indirect UBOs. For indirect
1477 * block numbers (if that's possible), we don't know
1478 * enough about the hardware yet. For indirect sources,
1479 * we know what we need but we need to add some NIR
1480 * support for lowering correctly with respect to
1483 assert(nir_src_is_const(index
));
1484 assert(nir_src_is_const(*src_offset
));
1486 uint32_t uindex
= nir_src_as_uint(index
) + 1;
1487 emit_ubo_read(ctx
, &instr
->instr
, reg
, offset
, NULL
, uindex
);
1488 } else if (is_ssbo
) {
1489 nir_src index
= instr
->src
[0];
1490 assert(nir_src_is_const(index
));
1491 uint32_t uindex
= nir_src_as_uint(index
);
1493 emit_ssbo_access(ctx
, &instr
->instr
, true, reg
, offset
, indirect_offset
, uindex
);
1494 } else if (ctx
->stage
== MESA_SHADER_FRAGMENT
&& !ctx
->is_blend
) {
1495 emit_varying_read(ctx
, reg
, offset
, nr_comp
, component
, !direct
? &instr
->src
[0] : NULL
, t
);
1496 } else if (ctx
->is_blend
) {
1497 /* For blend shaders, load the input color, which is
1498 * preloaded to r0 */
1500 midgard_instruction move
= v_mov(SSA_FIXED_REGISTER(0), blank_alu_src
, reg
);
1501 emit_mir_instruction(ctx
, move
);
1502 } else if (ctx
->stage
== MESA_SHADER_VERTEX
) {
1503 midgard_instruction ins
= m_ld_attr_32(reg
, offset
);
1504 ins
.load_store
.arg_1
= 0x1E;
1505 ins
.load_store
.arg_2
= 0x1E;
1506 ins
.mask
= mask_of(nr_comp
);
1508 /* Use the type appropriate load */
1512 ins
.load_store
.op
= midgard_op_ld_attr_32u
;
1515 ins
.load_store
.op
= midgard_op_ld_attr_32i
;
1517 case nir_type_float
:
1518 ins
.load_store
.op
= midgard_op_ld_attr_32
;
1521 unreachable("Attempted to load unknown type");
1525 emit_mir_instruction(ctx
, ins
);
1527 DBG("Unknown load\n");
1534 /* Reads 128-bit value raw off the tilebuffer during blending, tasty */
1536 case nir_intrinsic_load_raw_output_pan
:
1537 reg
= nir_dest_index(ctx
, &instr
->dest
);
1538 assert(ctx
->is_blend
);
1540 midgard_instruction ins
= m_ld_color_buffer_8(reg
, 0);
1541 emit_mir_instruction(ctx
, ins
);
1544 case nir_intrinsic_load_blend_const_color_rgba
: {
1545 assert(ctx
->is_blend
);
1546 reg
= nir_dest_index(ctx
, &instr
->dest
);
1548 /* Blend constants are embedded directly in the shader and
1549 * patched in, so we use some magic routing */
1551 midgard_instruction ins
= v_mov(SSA_FIXED_REGISTER(REGISTER_CONSTANT
), blank_alu_src
, reg
);
1552 ins
.has_constants
= true;
1553 ins
.has_blend_constant
= true;
1554 emit_mir_instruction(ctx
, ins
);
1558 case nir_intrinsic_store_output
:
1559 assert(nir_src_is_const(instr
->src
[1]) && "no indirect outputs");
1561 offset
= nir_intrinsic_base(instr
) + nir_src_as_uint(instr
->src
[1]);
1563 reg
= nir_src_index(ctx
, &instr
->src
[0]);
1565 if (ctx
->stage
== MESA_SHADER_FRAGMENT
) {
1566 /* Determine number of render targets */
1567 emit_fragment_store(ctx
, reg
, offset
);
1568 } else if (ctx
->stage
== MESA_SHADER_VERTEX
) {
1569 /* We should have been vectorized, though we don't
1570 * currently check that st_vary is emitted only once
1571 * per slot (this is relevant, since there's not a mask
1572 * parameter available on the store [set to 0 by the
1573 * blob]). We do respect the component by adjusting the
1574 * swizzle. If this is a constant source, we'll need to
1575 * emit that explicitly. */
1577 emit_explicit_constant(ctx
, reg
, reg
);
1579 unsigned component
= nir_intrinsic_component(instr
);
1581 midgard_instruction st
= m_st_vary_32(reg
, offset
);
1582 st
.load_store
.arg_1
= 0x9E;
1583 st
.load_store
.arg_2
= 0x1E;
1584 st
.load_store
.swizzle
= SWIZZLE_XYZW
<< (2*component
);
1585 emit_mir_instruction(ctx
, st
);
1587 DBG("Unknown store\n");
1593 /* Special case of store_output for lowered blend shaders */
1594 case nir_intrinsic_store_raw_output_pan
:
1595 assert (ctx
->stage
== MESA_SHADER_FRAGMENT
);
1596 reg
= nir_src_index(ctx
, &instr
->src
[0]);
1597 emit_fragment_store(ctx
, reg
, 0);
1601 case nir_intrinsic_store_ssbo
:
1602 assert(nir_src_is_const(instr
->src
[1]));
1604 bool direct_offset
= nir_src_is_const(instr
->src
[2]);
1605 offset
= direct_offset
? nir_src_as_uint(instr
->src
[2]) : 0;
1606 nir_src
*indirect_offset
= direct_offset
? NULL
: &instr
->src
[2];
1607 reg
= nir_src_index(ctx
, &instr
->src
[0]);
1609 uint32_t uindex
= nir_src_as_uint(instr
->src
[1]);
1611 emit_explicit_constant(ctx
, reg
, reg
);
1612 emit_ssbo_access(ctx
, &instr
->instr
, false, reg
, offset
, indirect_offset
, uindex
);
1615 case nir_intrinsic_load_alpha_ref_float
:
1616 assert(instr
->dest
.is_ssa
);
1618 float ref_value
= ctx
->alpha_ref
;
1620 /* See emit_load_const */
1621 float *v
= ralloc_array(NULL
, float, 4);
1622 memcpy(v
, &ref_value
, sizeof(float));
1623 _mesa_hash_table_u64_insert(ctx
->ssa_constants
, (instr
->dest
.ssa
.index
<< 1) + 1, v
);
1626 case nir_intrinsic_load_viewport_scale
:
1627 case nir_intrinsic_load_viewport_offset
:
1628 case nir_intrinsic_load_num_work_groups
:
1629 emit_sysval_read(ctx
, &instr
->instr
, -1, 3);
1632 case nir_intrinsic_load_work_group_id
:
1633 case nir_intrinsic_load_local_invocation_id
:
1634 emit_compute_builtin(ctx
, instr
);
1638 printf ("Unhandled intrinsic\n");
1645 midgard_tex_format(enum glsl_sampler_dim dim
)
1648 case GLSL_SAMPLER_DIM_1D
:
1649 case GLSL_SAMPLER_DIM_BUF
:
1652 case GLSL_SAMPLER_DIM_2D
:
1653 case GLSL_SAMPLER_DIM_EXTERNAL
:
1654 case GLSL_SAMPLER_DIM_RECT
:
1657 case GLSL_SAMPLER_DIM_3D
:
1660 case GLSL_SAMPLER_DIM_CUBE
:
1661 return MALI_TEX_CUBE
;
1664 DBG("Unknown sampler dim type\n");
1670 /* Tries to attach an explicit LOD / bias as a constant. Returns whether this
1674 pan_attach_constant_bias(
1675 compiler_context
*ctx
,
1677 midgard_texture_word
*word
)
1679 /* To attach as constant, it has to *be* constant */
1681 if (!nir_src_is_const(lod
))
1684 float f
= nir_src_as_float(lod
);
1686 /* Break into fixed-point */
1688 float lod_frac
= f
- lod_int
;
1690 /* Carry over negative fractions */
1691 if (lod_frac
< 0.0) {
1697 word
->bias
= float_to_ubyte(lod_frac
);
1698 word
->bias_int
= lod_int
;
1703 static enum mali_sampler_type
1704 midgard_sampler_type(nir_alu_type t
) {
1705 switch (nir_alu_type_get_base_type(t
))
1707 case nir_type_float
:
1708 return MALI_SAMPLER_FLOAT
;
1710 return MALI_SAMPLER_SIGNED
;
1712 return MALI_SAMPLER_UNSIGNED
;
1714 unreachable("Unknown sampler type");
1719 emit_texop_native(compiler_context
*ctx
, nir_tex_instr
*instr
,
1720 unsigned midgard_texop
)
1723 //assert (!instr->sampler);
1724 //assert (!instr->texture_array_size);
1726 int texture_index
= instr
->texture_index
;
1727 int sampler_index
= texture_index
;
1729 /* No helper to build texture words -- we do it all here */
1730 midgard_instruction ins
= {
1731 .type
= TAG_TEXTURE_4
,
1734 .dest
= nir_dest_index(ctx
, &instr
->dest
),
1735 .src
= { -1, -1, -1 },
1738 .op
= midgard_texop
,
1739 .format
= midgard_tex_format(instr
->sampler_dim
),
1740 .texture_handle
= texture_index
,
1741 .sampler_handle
= sampler_index
,
1742 .swizzle
= SWIZZLE_XYZW
,
1743 .in_reg_swizzle
= SWIZZLE_XYZW
,
1749 .sampler_type
= midgard_sampler_type(instr
->dest_type
),
1753 for (unsigned i
= 0; i
< instr
->num_srcs
; ++i
) {
1754 int index
= nir_src_index(ctx
, &instr
->src
[i
].src
);
1755 midgard_vector_alu_src alu_src
= blank_alu_src
;
1757 switch (instr
->src
[i
].src_type
) {
1758 case nir_tex_src_coord
: {
1759 emit_explicit_constant(ctx
, index
, index
);
1761 /* Texelfetch coordinates uses all four elements
1762 * (xyz/index) regardless of texture dimensionality,
1763 * which means it's necessary to zero the unused
1764 * components to keep everything happy */
1766 if (midgard_texop
== TEXTURE_OP_TEXEL_FETCH
) {
1767 unsigned old_index
= index
;
1769 index
= make_compiler_temp(ctx
);
1771 /* mov index, old_index */
1772 midgard_instruction mov
= v_mov(old_index
, blank_alu_src
, index
);
1774 emit_mir_instruction(ctx
, mov
);
1776 /* mov index.zw, #0 */
1777 mov
= v_mov(SSA_FIXED_REGISTER(REGISTER_CONSTANT
),
1778 blank_alu_src
, index
);
1779 mov
.has_constants
= true;
1780 mov
.mask
= (1 << COMPONENT_Z
) | (1 << COMPONENT_W
);
1781 emit_mir_instruction(ctx
, mov
);
1784 if (instr
->sampler_dim
== GLSL_SAMPLER_DIM_CUBE
) {
1785 /* texelFetch is undefined on samplerCube */
1786 assert(midgard_texop
!= TEXTURE_OP_TEXEL_FETCH
);
1788 /* For cubemaps, we use a special ld/st op to
1789 * select the face and copy the xy into the
1790 * texture register */
1792 unsigned temp
= make_compiler_temp(ctx
);
1793 midgard_instruction st
= m_st_cubemap_coords(temp
, 0);
1794 st
.ssa_args
.src
[0] = index
;
1795 st
.mask
= 0x3; /* xy */
1796 st
.load_store
.arg_1
= 0x20;
1797 st
.load_store
.swizzle
= alu_src
.swizzle
;
1798 emit_mir_instruction(ctx
, st
);
1800 ins
.ssa_args
.src
[0] = temp
;
1802 ins
.ssa_args
.src
[0] = index
;
1805 if (instr
->sampler_dim
== GLSL_SAMPLER_DIM_2D
) {
1806 /* Array component in w but NIR wants it in z */
1807 ins
.texture
.in_reg_swizzle
= SWIZZLE_XYZZ
;
1813 case nir_tex_src_bias
:
1814 case nir_tex_src_lod
: {
1815 /* Try as a constant if we can */
1817 bool is_txf
= midgard_texop
== TEXTURE_OP_TEXEL_FETCH
;
1818 if (!is_txf
&& pan_attach_constant_bias(ctx
, instr
->src
[i
].src
, &ins
.texture
))
1821 ins
.texture
.lod_register
= true;
1822 ins
.ssa_args
.src
[1] = index
;
1823 emit_explicit_constant(ctx
, index
, index
);
1829 unreachable("Unknown texture source type\n");
1833 emit_mir_instruction(ctx
, ins
);
1835 /* Used for .cont and .last hinting */
1836 ctx
->texture_op_count
++;
1840 emit_tex(compiler_context
*ctx
, nir_tex_instr
*instr
)
1842 /* Fixup op, since only textureLod is permitted in VS but NIR can give
1843 * generic tex in some cases (which confuses the hardware) */
1845 bool is_vertex
= ctx
->stage
== MESA_SHADER_VERTEX
;
1847 if (is_vertex
&& instr
->op
== nir_texop_tex
)
1848 instr
->op
= nir_texop_txl
;
1850 switch (instr
->op
) {
1853 emit_texop_native(ctx
, instr
, TEXTURE_OP_NORMAL
);
1856 emit_texop_native(ctx
, instr
, TEXTURE_OP_LOD
);
1859 emit_texop_native(ctx
, instr
, TEXTURE_OP_TEXEL_FETCH
);
1862 emit_sysval_read(ctx
, &instr
->instr
, -1, 4);
1865 unreachable("Unhanlded texture op");
1870 emit_jump(compiler_context
*ctx
, nir_jump_instr
*instr
)
1872 switch (instr
->type
) {
1873 case nir_jump_break
: {
1874 /* Emit a branch out of the loop */
1875 struct midgard_instruction br
= v_branch(false, false);
1876 br
.branch
.target_type
= TARGET_BREAK
;
1877 br
.branch
.target_break
= ctx
->current_loop_depth
;
1878 emit_mir_instruction(ctx
, br
);
1883 DBG("Unknown jump type %d\n", instr
->type
);
1889 emit_instr(compiler_context
*ctx
, struct nir_instr
*instr
)
1891 switch (instr
->type
) {
1892 case nir_instr_type_load_const
:
1893 emit_load_const(ctx
, nir_instr_as_load_const(instr
));
1896 case nir_instr_type_intrinsic
:
1897 emit_intrinsic(ctx
, nir_instr_as_intrinsic(instr
));
1900 case nir_instr_type_alu
:
1901 emit_alu(ctx
, nir_instr_as_alu(instr
));
1904 case nir_instr_type_tex
:
1905 emit_tex(ctx
, nir_instr_as_tex(instr
));
1908 case nir_instr_type_jump
:
1909 emit_jump(ctx
, nir_instr_as_jump(instr
));
1912 case nir_instr_type_ssa_undef
:
1917 DBG("Unhandled instruction type\n");
1923 /* ALU instructions can inline or embed constants, which decreases register
1924 * pressure and saves space. */
1926 #define CONDITIONAL_ATTACH(src) { \
1927 void *entry = _mesa_hash_table_u64_search(ctx->ssa_constants, alu->ssa_args.src + 1); \
1930 attach_constants(ctx, alu, entry, alu->ssa_args.src + 1); \
1931 alu->ssa_args.src = SSA_FIXED_REGISTER(REGISTER_CONSTANT); \
1936 inline_alu_constants(compiler_context
*ctx
)
1938 mir_foreach_instr(ctx
, alu
) {
1939 /* Other instructions cannot inline constants */
1940 if (alu
->type
!= TAG_ALU_4
) continue;
1942 /* If there is already a constant here, we can do nothing */
1943 if (alu
->has_constants
) continue;
1945 CONDITIONAL_ATTACH(src
[0]);
1947 if (!alu
->has_constants
) {
1948 CONDITIONAL_ATTACH(src
[1])
1949 } else if (!alu
->inline_constant
) {
1950 /* Corner case: _two_ vec4 constants, for instance with a
1951 * csel. For this case, we can only use a constant
1952 * register for one, we'll have to emit a move for the
1953 * other. Note, if both arguments are constants, then
1954 * necessarily neither argument depends on the value of
1955 * any particular register. As the destination register
1956 * will be wiped, that means we can spill the constant
1957 * to the destination register.
1960 void *entry
= _mesa_hash_table_u64_search(ctx
->ssa_constants
, alu
->ssa_args
.src
[1] + 1);
1961 unsigned scratch
= alu
->ssa_args
.dest
;
1964 midgard_instruction ins
= v_mov(SSA_FIXED_REGISTER(REGISTER_CONSTANT
), blank_alu_src
, scratch
);
1965 attach_constants(ctx
, &ins
, entry
, alu
->ssa_args
.src
[1] + 1);
1967 /* Force a break XXX Defer r31 writes */
1968 ins
.unit
= UNIT_VLUT
;
1970 /* Set the source */
1971 alu
->ssa_args
.src
[1] = scratch
;
1973 /* Inject us -before- the last instruction which set r31 */
1974 mir_insert_instruction_before(mir_prev_op(alu
), ins
);
1980 /* Being a little silly with the names, but returns the op that is the bitwise
1981 * inverse of the op with the argument switched. I.e. (f and g are
1984 * f(a, b) = ~g(b, a)
1986 * Corollary: if g is the contrapositve of f, f is the contrapositive of g:
1988 * f(a, b) = ~g(b, a)
1989 * ~f(a, b) = g(b, a)
1990 * ~f(a, b) = ~h(a, b) where h is the contrapositive of g
1993 * Thus we define this function in pairs.
1996 static inline midgard_alu_op
1997 mir_contrapositive(midgard_alu_op op
)
2000 case midgard_alu_op_flt
:
2001 return midgard_alu_op_fle
;
2002 case midgard_alu_op_fle
:
2003 return midgard_alu_op_flt
;
2005 case midgard_alu_op_ilt
:
2006 return midgard_alu_op_ile
;
2007 case midgard_alu_op_ile
:
2008 return midgard_alu_op_ilt
;
2011 unreachable("No known contrapositive");
2015 /* Midgard supports two types of constants, embedded constants (128-bit) and
2016 * inline constants (16-bit). Sometimes, especially with scalar ops, embedded
2017 * constants can be demoted to inline constants, for space savings and
2018 * sometimes a performance boost */
2021 embedded_to_inline_constant(compiler_context
*ctx
)
2023 mir_foreach_instr(ctx
, ins
) {
2024 if (!ins
->has_constants
) continue;
2026 if (ins
->ssa_args
.inline_constant
) continue;
2028 /* Blend constants must not be inlined by definition */
2029 if (ins
->has_blend_constant
) continue;
2031 /* We can inline 32-bit (sometimes) or 16-bit (usually) */
2032 bool is_16
= ins
->alu
.reg_mode
== midgard_reg_mode_16
;
2033 bool is_32
= ins
->alu
.reg_mode
== midgard_reg_mode_32
;
2035 if (!(is_16
|| is_32
))
2038 /* src1 cannot be an inline constant due to encoding
2039 * restrictions. So, if possible we try to flip the arguments
2042 int op
= ins
->alu
.op
;
2044 if (ins
->ssa_args
.src
[0] == SSA_FIXED_REGISTER(REGISTER_CONSTANT
)) {
2045 bool flip
= alu_opcode_props
[op
].props
& OP_COMMUTES
;
2048 /* Conditionals can be inverted */
2049 case midgard_alu_op_flt
:
2050 case midgard_alu_op_ilt
:
2051 case midgard_alu_op_fle
:
2052 case midgard_alu_op_ile
:
2053 ins
->alu
.op
= mir_contrapositive(ins
->alu
.op
);
2058 case midgard_alu_op_fcsel
:
2059 case midgard_alu_op_icsel
:
2060 DBG("Missed non-commutative flip (%s)\n", alu_opcode_props
[op
].name
);
2066 /* Flip the SSA numbers */
2067 ins
->ssa_args
.src
[0] = ins
->ssa_args
.src
[1];
2068 ins
->ssa_args
.src
[1] = SSA_FIXED_REGISTER(REGISTER_CONSTANT
);
2070 /* And flip the modifiers */
2074 src_temp
= ins
->alu
.src2
;
2075 ins
->alu
.src2
= ins
->alu
.src1
;
2076 ins
->alu
.src1
= src_temp
;
2080 if (ins
->ssa_args
.src
[1] == SSA_FIXED_REGISTER(REGISTER_CONSTANT
)) {
2081 /* Extract the source information */
2083 midgard_vector_alu_src
*src
;
2084 int q
= ins
->alu
.src2
;
2085 midgard_vector_alu_src
*m
= (midgard_vector_alu_src
*) &q
;
2088 /* Component is from the swizzle, e.g. r26.w -> w component. TODO: What if x is masked out? */
2089 int component
= src
->swizzle
& 3;
2091 /* Scale constant appropriately, if we can legally */
2092 uint16_t scaled_constant
= 0;
2094 if (midgard_is_integer_op(op
) || is_16
) {
2095 unsigned int *iconstants
= (unsigned int *) ins
->constants
;
2096 scaled_constant
= (uint16_t) iconstants
[component
];
2098 /* Constant overflow after resize */
2099 if (scaled_constant
!= iconstants
[component
])
2102 float original
= (float) ins
->constants
[component
];
2103 scaled_constant
= _mesa_float_to_half(original
);
2105 /* Check for loss of precision. If this is
2106 * mediump, we don't care, but for a highp
2107 * shader, we need to pay attention. NIR
2108 * doesn't yet tell us which mode we're in!
2109 * Practically this prevents most constants
2110 * from being inlined, sadly. */
2112 float fp32
= _mesa_half_to_float(scaled_constant
);
2114 if (fp32
!= original
)
2118 /* We don't know how to handle these with a constant */
2120 if (mir_nontrivial_source2_mod_simple(ins
) || src
->rep_low
|| src
->rep_high
) {
2121 DBG("Bailing inline constant...\n");
2125 /* Make sure that the constant is not itself a
2126 * vector by checking if all accessed values
2127 * (by the swizzle) are the same. */
2129 uint32_t *cons
= (uint32_t *) ins
->constants
;
2130 uint32_t value
= cons
[component
];
2132 bool is_vector
= false;
2133 unsigned mask
= effective_writemask(&ins
->alu
, ins
->mask
);
2135 for (int c
= 1; c
< 4; ++c
) {
2136 /* We only care if this component is actually used */
2137 if (!(mask
& (1 << c
)))
2140 uint32_t test
= cons
[(src
->swizzle
>> (2 * c
)) & 3];
2142 if (test
!= value
) {
2151 /* Get rid of the embedded constant */
2152 ins
->has_constants
= false;
2153 ins
->ssa_args
.src
[1] = -1;
2154 ins
->ssa_args
.inline_constant
= true;
2155 ins
->inline_constant
= scaled_constant
;
2160 /* Dead code elimination for branches at the end of a block - only one branch
2161 * per block is legal semantically */
2164 midgard_opt_cull_dead_branch(compiler_context
*ctx
, midgard_block
*block
)
2166 bool branched
= false;
2168 mir_foreach_instr_in_block_safe(block
, ins
) {
2169 if (!midgard_is_branch_unit(ins
->unit
)) continue;
2171 /* We ignore prepacked branches since the fragment epilogue is
2172 * just generally special */
2173 if (ins
->prepacked_branch
) continue;
2175 /* Discards are similarly special and may not correspond to the
2178 if (ins
->branch
.target_type
== TARGET_DISCARD
) continue;
2181 /* We already branched, so this is dead */
2182 mir_remove_instruction(ins
);
2189 /* fmov.pos is an idiom for fpos. Propoagate the .pos up to the source, so then
2190 * the move can be propagated away entirely */
2193 mir_compose_float_outmod(midgard_outmod_float
*outmod
, midgard_outmod_float comp
)
2196 if (comp
== midgard_outmod_none
)
2199 if (*outmod
== midgard_outmod_none
) {
2204 /* TODO: Compose rules */
2209 midgard_opt_pos_propagate(compiler_context
*ctx
, midgard_block
*block
)
2211 bool progress
= false;
2213 mir_foreach_instr_in_block_safe(block
, ins
) {
2214 if (ins
->type
!= TAG_ALU_4
) continue;
2215 if (ins
->alu
.op
!= midgard_alu_op_fmov
) continue;
2216 if (ins
->alu
.outmod
!= midgard_outmod_pos
) continue;
2218 /* TODO: Registers? */
2219 unsigned src
= ins
->ssa_args
.src
[1];
2220 if (src
& IS_REG
) continue;
2221 assert(!mir_has_multiple_writes(ctx
, src
));
2223 /* There might be a source modifier, too */
2224 if (mir_nontrivial_source2_mod(ins
)) continue;
2226 /* Backpropagate the modifier */
2227 mir_foreach_instr_in_block_from_rev(block
, v
, mir_prev_op(ins
)) {
2228 if (v
->type
!= TAG_ALU_4
) continue;
2229 if (v
->ssa_args
.dest
!= src
) continue;
2231 /* Can we even take a float outmod? */
2232 if (midgard_is_integer_out_op(v
->alu
.op
)) continue;
2234 midgard_outmod_float temp
= v
->alu
.outmod
;
2235 progress
|= mir_compose_float_outmod(&temp
, ins
->alu
.outmod
);
2237 /* Throw in the towel.. */
2238 if (!progress
) break;
2240 /* Otherwise, transfer the modifier */
2241 v
->alu
.outmod
= temp
;
2242 ins
->alu
.outmod
= midgard_outmod_none
;
2252 emit_fragment_epilogue(compiler_context
*ctx
)
2254 /* Just emit the last chunk with the branch */
2255 EMIT(alu_br_compact_cond
, midgard_jmp_writeout_op_writeout
, TAG_ALU_4
, -1, midgard_condition_always
);
2258 static midgard_block
*
2259 create_empty_block(compiler_context
*ctx
)
2261 midgard_block
*blk
= rzalloc(ctx
, midgard_block
);
2263 blk
->predecessors
= _mesa_set_create(blk
,
2265 _mesa_key_pointer_equal
);
2270 static midgard_block
*
2271 emit_block(compiler_context
*ctx
, nir_block
*block
)
2273 midgard_block
*this_block
= ctx
->after_block
;
2274 ctx
->after_block
= NULL
;
2277 this_block
= create_empty_block(ctx
);
2279 list_addtail(&this_block
->link
, &ctx
->blocks
);
2281 this_block
->is_scheduled
= false;
2284 ctx
->texture_index
[0] = -1;
2285 ctx
->texture_index
[1] = -1;
2287 /* Set up current block */
2288 list_inithead(&this_block
->instructions
);
2289 ctx
->current_block
= this_block
;
2291 nir_foreach_instr(instr
, block
) {
2292 emit_instr(ctx
, instr
);
2293 ++ctx
->instruction_count
;
2296 inline_alu_constants(ctx
);
2297 embedded_to_inline_constant(ctx
);
2299 /* Append fragment shader epilogue (value writeout) */
2300 if (ctx
->stage
== MESA_SHADER_FRAGMENT
) {
2301 if (block
== nir_impl_last_block(ctx
->func
->impl
)) {
2302 emit_fragment_epilogue(ctx
);
2306 /* Allow the next control flow to access us retroactively, for
2308 ctx
->current_block
= this_block
;
2313 static midgard_block
*emit_cf_list(struct compiler_context
*ctx
, struct exec_list
*list
);
2316 emit_if(struct compiler_context
*ctx
, nir_if
*nif
)
2318 midgard_block
*before_block
= ctx
->current_block
;
2320 /* Conditional branches expect the condition in r31.w; emit a move for
2321 * that in the _previous_ block (which is the current block). */
2322 emit_condition(ctx
, &nif
->condition
, true, COMPONENT_X
);
2324 /* Speculatively emit the branch, but we can't fill it in until later */
2325 EMIT(branch
, true, true);
2326 midgard_instruction
*then_branch
= mir_last_in_block(ctx
->current_block
);
2328 /* Emit the two subblocks. */
2329 midgard_block
*then_block
= emit_cf_list(ctx
, &nif
->then_list
);
2330 midgard_block
*end_then_block
= ctx
->current_block
;
2332 /* Emit a jump from the end of the then block to the end of the else */
2333 EMIT(branch
, false, false);
2334 midgard_instruction
*then_exit
= mir_last_in_block(ctx
->current_block
);
2336 /* Emit second block, and check if it's empty */
2338 int else_idx
= ctx
->block_count
;
2339 int count_in
= ctx
->instruction_count
;
2340 midgard_block
*else_block
= emit_cf_list(ctx
, &nif
->else_list
);
2341 midgard_block
*end_else_block
= ctx
->current_block
;
2342 int after_else_idx
= ctx
->block_count
;
2344 /* Now that we have the subblocks emitted, fix up the branches */
2349 if (ctx
->instruction_count
== count_in
) {
2350 /* The else block is empty, so don't emit an exit jump */
2351 mir_remove_instruction(then_exit
);
2352 then_branch
->branch
.target_block
= after_else_idx
;
2354 then_branch
->branch
.target_block
= else_idx
;
2355 then_exit
->branch
.target_block
= after_else_idx
;
2358 /* Wire up the successors */
2360 ctx
->after_block
= create_empty_block(ctx
);
2362 midgard_block_add_successor(before_block
, then_block
);
2363 midgard_block_add_successor(before_block
, else_block
);
2365 midgard_block_add_successor(end_then_block
, ctx
->after_block
);
2366 midgard_block_add_successor(end_else_block
, ctx
->after_block
);
2370 emit_loop(struct compiler_context
*ctx
, nir_loop
*nloop
)
2372 /* Remember where we are */
2373 midgard_block
*start_block
= ctx
->current_block
;
2375 /* Allocate a loop number, growing the current inner loop depth */
2376 int loop_idx
= ++ctx
->current_loop_depth
;
2378 /* Get index from before the body so we can loop back later */
2379 int start_idx
= ctx
->block_count
;
2381 /* Emit the body itself */
2382 midgard_block
*loop_block
= emit_cf_list(ctx
, &nloop
->body
);
2384 /* Branch back to loop back */
2385 struct midgard_instruction br_back
= v_branch(false, false);
2386 br_back
.branch
.target_block
= start_idx
;
2387 emit_mir_instruction(ctx
, br_back
);
2389 /* Mark down that branch in the graph. */
2390 midgard_block_add_successor(start_block
, loop_block
);
2391 midgard_block_add_successor(ctx
->current_block
, loop_block
);
2393 /* Find the index of the block about to follow us (note: we don't add
2394 * one; blocks are 0-indexed so we get a fencepost problem) */
2395 int break_block_idx
= ctx
->block_count
;
2397 /* Fix up the break statements we emitted to point to the right place,
2398 * now that we can allocate a block number for them */
2399 ctx
->after_block
= create_empty_block(ctx
);
2401 list_for_each_entry_from(struct midgard_block
, block
, start_block
, &ctx
->blocks
, link
) {
2402 mir_foreach_instr_in_block(block
, ins
) {
2403 if (ins
->type
!= TAG_ALU_4
) continue;
2404 if (!ins
->compact_branch
) continue;
2405 if (ins
->prepacked_branch
) continue;
2407 /* We found a branch -- check the type to see if we need to do anything */
2408 if (ins
->branch
.target_type
!= TARGET_BREAK
) continue;
2410 /* It's a break! Check if it's our break */
2411 if (ins
->branch
.target_break
!= loop_idx
) continue;
2413 /* Okay, cool, we're breaking out of this loop.
2414 * Rewrite from a break to a goto */
2416 ins
->branch
.target_type
= TARGET_GOTO
;
2417 ins
->branch
.target_block
= break_block_idx
;
2419 midgard_block_add_successor(block
, ctx
->after_block
);
2423 /* Now that we've finished emitting the loop, free up the depth again
2424 * so we play nice with recursion amid nested loops */
2425 --ctx
->current_loop_depth
;
2427 /* Dump loop stats */
2431 static midgard_block
*
2432 emit_cf_list(struct compiler_context
*ctx
, struct exec_list
*list
)
2434 midgard_block
*start_block
= NULL
;
2436 foreach_list_typed(nir_cf_node
, node
, node
, list
) {
2437 switch (node
->type
) {
2438 case nir_cf_node_block
: {
2439 midgard_block
*block
= emit_block(ctx
, nir_cf_node_as_block(node
));
2442 start_block
= block
;
2447 case nir_cf_node_if
:
2448 emit_if(ctx
, nir_cf_node_as_if(node
));
2451 case nir_cf_node_loop
:
2452 emit_loop(ctx
, nir_cf_node_as_loop(node
));
2455 case nir_cf_node_function
:
2464 /* Due to lookahead, we need to report the first tag executed in the command
2465 * stream and in branch targets. An initial block might be empty, so iterate
2466 * until we find one that 'works' */
2469 midgard_get_first_tag_from_block(compiler_context
*ctx
, unsigned block_idx
)
2471 midgard_block
*initial_block
= mir_get_block(ctx
, block_idx
);
2473 unsigned first_tag
= 0;
2475 mir_foreach_block_from(ctx
, initial_block
, v
) {
2476 midgard_bundle
*initial_bundle
=
2477 util_dynarray_element(&v
->bundles
, midgard_bundle
, 0);
2479 if (initial_bundle
) {
2480 first_tag
= initial_bundle
->tag
;
2489 midgard_compile_shader_nir(struct midgard_screen
*screen
, nir_shader
*nir
, midgard_program
*program
, bool is_blend
)
2491 struct util_dynarray
*compiled
= &program
->compiled
;
2493 midgard_debug
= debug_get_option_midgard_debug();
2495 /* TODO: Bound against what? */
2496 compiler_context
*ctx
= rzalloc(NULL
, compiler_context
);
2499 ctx
->screen
= screen
;
2500 ctx
->stage
= nir
->info
.stage
;
2501 ctx
->is_blend
= is_blend
;
2502 ctx
->alpha_ref
= program
->alpha_ref
;
2504 /* Start off with a safe cutoff, allowing usage of all 16 work
2505 * registers. Later, we'll promote uniform reads to uniform registers
2506 * if we determine it is beneficial to do so */
2507 ctx
->uniform_cutoff
= 8;
2509 /* Initialize at a global (not block) level hash tables */
2511 ctx
->ssa_constants
= _mesa_hash_table_u64_create(NULL
);
2512 ctx
->hash_to_temp
= _mesa_hash_table_u64_create(NULL
);
2513 ctx
->sysval_to_id
= _mesa_hash_table_u64_create(NULL
);
2515 /* Record the varying mapping for the command stream's bookkeeping */
2517 struct exec_list
*varyings
=
2518 ctx
->stage
== MESA_SHADER_VERTEX
? &nir
->outputs
: &nir
->inputs
;
2520 unsigned max_varying
= 0;
2521 nir_foreach_variable(var
, varyings
) {
2522 unsigned loc
= var
->data
.driver_location
;
2523 unsigned sz
= glsl_type_size(var
->type
, FALSE
);
2525 for (int c
= 0; c
< sz
; ++c
) {
2526 program
->varyings
[loc
+ c
] = var
->data
.location
+ c
;
2527 max_varying
= MAX2(max_varying
, loc
+ c
);
2531 /* Lower gl_Position pre-optimisation, but after lowering vars to ssa
2532 * (so we don't accidentally duplicate the epilogue since mesa/st has
2533 * messed with our I/O quite a bit already) */
2535 NIR_PASS_V(nir
, nir_lower_vars_to_ssa
);
2537 if (ctx
->stage
== MESA_SHADER_VERTEX
) {
2538 NIR_PASS_V(nir
, nir_lower_viewport_transform
);
2539 NIR_PASS_V(nir
, nir_clamp_psiz
, 1.0, 1024.0);
2542 NIR_PASS_V(nir
, nir_lower_var_copies
);
2543 NIR_PASS_V(nir
, nir_lower_vars_to_ssa
);
2544 NIR_PASS_V(nir
, nir_split_var_copies
);
2545 NIR_PASS_V(nir
, nir_lower_var_copies
);
2546 NIR_PASS_V(nir
, nir_lower_global_vars_to_local
);
2547 NIR_PASS_V(nir
, nir_lower_var_copies
);
2548 NIR_PASS_V(nir
, nir_lower_vars_to_ssa
);
2550 NIR_PASS_V(nir
, nir_lower_io
, nir_var_all
, glsl_type_size
, 0);
2552 /* Optimisation passes */
2556 if (midgard_debug
& MIDGARD_DBG_SHADERS
) {
2557 nir_print_shader(nir
, stdout
);
2560 /* Assign sysvals and counts, now that we're sure
2561 * (post-optimisation) */
2563 midgard_nir_assign_sysvals(ctx
, nir
);
2565 program
->uniform_count
= nir
->num_uniforms
;
2566 program
->sysval_count
= ctx
->sysval_count
;
2567 memcpy(program
->sysvals
, ctx
->sysvals
, sizeof(ctx
->sysvals
[0]) * ctx
->sysval_count
);
2569 nir_foreach_function(func
, nir
) {
2573 list_inithead(&ctx
->blocks
);
2574 ctx
->block_count
= 0;
2577 emit_cf_list(ctx
, &func
->impl
->body
);
2579 /* Emit empty exit block with successor */
2581 struct midgard_block
*semi_end
= ctx
->current_block
;
2583 struct midgard_block
*end
=
2584 emit_block(ctx
, func
->impl
->end_block
);
2586 midgard_block_add_successor(semi_end
, end
);
2588 break; /* TODO: Multi-function shaders */
2591 util_dynarray_init(compiled
, NULL
);
2593 /* MIR-level optimizations */
2595 bool progress
= false;
2600 mir_foreach_block(ctx
, block
) {
2601 progress
|= midgard_opt_pos_propagate(ctx
, block
);
2602 progress
|= midgard_opt_copy_prop(ctx
, block
);
2603 progress
|= midgard_opt_dead_code_eliminate(ctx
, block
);
2604 progress
|= midgard_opt_combine_projection(ctx
, block
);
2605 progress
|= midgard_opt_varying_projection(ctx
, block
);
2606 progress
|= midgard_opt_not_propagate(ctx
, block
);
2607 progress
|= midgard_opt_fuse_src_invert(ctx
, block
);
2608 progress
|= midgard_opt_fuse_dest_invert(ctx
, block
);
2612 mir_foreach_block(ctx
, block
) {
2613 midgard_lower_invert(ctx
, block
);
2614 midgard_lower_derivatives(ctx
, block
);
2617 /* Nested control-flow can result in dead branches at the end of the
2618 * block. This messes with our analysis and is just dead code, so cull
2620 mir_foreach_block(ctx
, block
) {
2621 midgard_opt_cull_dead_branch(ctx
, block
);
2624 /* Ensure we were lowered */
2625 mir_foreach_instr_global(ctx
, ins
) {
2626 assert(!ins
->invert
);
2630 schedule_program(ctx
);
2632 /* Now that all the bundles are scheduled and we can calculate block
2633 * sizes, emit actual branch instructions rather than placeholders */
2635 int br_block_idx
= 0;
2637 mir_foreach_block(ctx
, block
) {
2638 util_dynarray_foreach(&block
->bundles
, midgard_bundle
, bundle
) {
2639 for (int c
= 0; c
< bundle
->instruction_count
; ++c
) {
2640 midgard_instruction
*ins
= bundle
->instructions
[c
];
2642 if (!midgard_is_branch_unit(ins
->unit
)) continue;
2644 if (ins
->prepacked_branch
) continue;
2646 /* Parse some basic branch info */
2647 bool is_compact
= ins
->unit
== ALU_ENAB_BR_COMPACT
;
2648 bool is_conditional
= ins
->branch
.conditional
;
2649 bool is_inverted
= ins
->branch
.invert_conditional
;
2650 bool is_discard
= ins
->branch
.target_type
== TARGET_DISCARD
;
2652 /* Determine the block we're jumping to */
2653 int target_number
= ins
->branch
.target_block
;
2655 /* Report the destination tag */
2656 int dest_tag
= is_discard
? 0 : midgard_get_first_tag_from_block(ctx
, target_number
);
2658 /* Count up the number of quadwords we're
2659 * jumping over = number of quadwords until
2660 * (br_block_idx, target_number) */
2662 int quadword_offset
= 0;
2666 } else if (target_number
> br_block_idx
) {
2669 for (int idx
= br_block_idx
+ 1; idx
< target_number
; ++idx
) {
2670 midgard_block
*blk
= mir_get_block(ctx
, idx
);
2673 quadword_offset
+= blk
->quadword_count
;
2676 /* Jump backwards */
2678 for (int idx
= br_block_idx
; idx
>= target_number
; --idx
) {
2679 midgard_block
*blk
= mir_get_block(ctx
, idx
);
2682 quadword_offset
-= blk
->quadword_count
;
2686 /* Unconditional extended branches (far jumps)
2687 * have issues, so we always use a conditional
2688 * branch, setting the condition to always for
2689 * unconditional. For compact unconditional
2690 * branches, cond isn't used so it doesn't
2691 * matter what we pick. */
2693 midgard_condition cond
=
2694 !is_conditional
? midgard_condition_always
:
2695 is_inverted
? midgard_condition_false
:
2696 midgard_condition_true
;
2698 midgard_jmp_writeout_op op
=
2699 is_discard
? midgard_jmp_writeout_op_discard
:
2700 (is_compact
&& !is_conditional
) ? midgard_jmp_writeout_op_branch_uncond
:
2701 midgard_jmp_writeout_op_branch_cond
;
2704 midgard_branch_extended branch
=
2705 midgard_create_branch_extended(
2710 memcpy(&ins
->branch_extended
, &branch
, sizeof(branch
));
2711 } else if (is_conditional
|| is_discard
) {
2712 midgard_branch_cond branch
= {
2714 .dest_tag
= dest_tag
,
2715 .offset
= quadword_offset
,
2719 assert(branch
.offset
== quadword_offset
);
2721 memcpy(&ins
->br_compact
, &branch
, sizeof(branch
));
2723 assert(op
== midgard_jmp_writeout_op_branch_uncond
);
2725 midgard_branch_uncond branch
= {
2727 .dest_tag
= dest_tag
,
2728 .offset
= quadword_offset
,
2732 assert(branch
.offset
== quadword_offset
);
2734 memcpy(&ins
->br_compact
, &branch
, sizeof(branch
));
2742 /* Emit flat binary from the instruction arrays. Iterate each block in
2743 * sequence. Save instruction boundaries such that lookahead tags can
2744 * be assigned easily */
2746 /* Cache _all_ bundles in source order for lookahead across failed branches */
2748 int bundle_count
= 0;
2749 mir_foreach_block(ctx
, block
) {
2750 bundle_count
+= block
->bundles
.size
/ sizeof(midgard_bundle
);
2752 midgard_bundle
**source_order_bundles
= malloc(sizeof(midgard_bundle
*) * bundle_count
);
2754 mir_foreach_block(ctx
, block
) {
2755 util_dynarray_foreach(&block
->bundles
, midgard_bundle
, bundle
) {
2756 source_order_bundles
[bundle_idx
++] = bundle
;
2760 int current_bundle
= 0;
2762 /* Midgard prefetches instruction types, so during emission we
2763 * need to lookahead. Unless this is the last instruction, in
2764 * which we return 1. Or if this is the second to last and the
2765 * last is an ALU, then it's also 1... */
2767 mir_foreach_block(ctx
, block
) {
2768 mir_foreach_bundle_in_block(block
, bundle
) {
2771 if (current_bundle
+ 1 < bundle_count
) {
2772 uint8_t next
= source_order_bundles
[current_bundle
+ 1]->tag
;
2774 if (!(current_bundle
+ 2 < bundle_count
) && IS_ALU(next
)) {
2781 emit_binary_bundle(ctx
, bundle
, compiled
, lookahead
);
2785 /* TODO: Free deeper */
2786 //util_dynarray_fini(&block->instructions);
2789 free(source_order_bundles
);
2791 /* Report the very first tag executed */
2792 program
->first_tag
= midgard_get_first_tag_from_block(ctx
, 0);
2794 /* Deal with off-by-one related to the fencepost problem */
2795 program
->work_register_count
= ctx
->work_registers
+ 1;
2796 program
->uniform_cutoff
= ctx
->uniform_cutoff
;
2798 program
->blend_patch_offset
= ctx
->blend_constant_offset
;
2799 program
->tls_size
= ctx
->tls_size
;
2801 if (midgard_debug
& MIDGARD_DBG_SHADERS
)
2802 disassemble_midgard(program
->compiled
.data
, program
->compiled
.size
, false, 0, "");
2804 if (midgard_debug
& MIDGARD_DBG_SHADERDB
) {
2805 unsigned nr_bundles
= 0, nr_ins
= 0, nr_quadwords
= 0;
2807 /* Count instructions and bundles */
2809 mir_foreach_instr_global(ctx
, ins
) {
2813 mir_foreach_block(ctx
, block
) {
2814 nr_bundles
+= util_dynarray_num_elements(
2815 &block
->bundles
, midgard_bundle
);
2817 nr_quadwords
+= block
->quadword_count
;
2820 /* Calculate thread count. There are certain cutoffs by
2821 * register count for thread count */
2823 unsigned nr_registers
= program
->work_register_count
;
2825 unsigned nr_threads
=
2826 (nr_registers
<= 4) ? 4 :
2827 (nr_registers
<= 8) ? 2 :
2832 fprintf(stderr
, "shader%d - %s shader: "
2833 "%u inst, %u bundles, %u quadwords, "
2834 "%u registers, %u threads, %u loops, "
2835 "%d:%d spills:fills\n",
2837 gl_shader_stage_name(ctx
->stage
),
2838 nr_ins
, nr_bundles
, nr_quadwords
,
2839 nr_registers
, nr_threads
,
2841 ctx
->spills
, ctx
->fills
);