2 * Copyright © 2016 Broadcom
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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
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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
25 #include "nir_builder.h"
27 /** @file nir_lower_io_to_scalar.c
29 * Replaces nir_load_input/nir_store_output operations with num_components !=
30 * 1 with individual per-channel operations.
34 lower_load_input_to_scalar(nir_builder
*b
, nir_intrinsic_instr
*intr
)
36 b
->cursor
= nir_before_instr(&intr
->instr
);
38 assert(intr
->dest
.is_ssa
);
40 nir_ssa_def
*loads
[4];
42 for (unsigned i
= 0; i
< intr
->num_components
; i
++) {
43 nir_intrinsic_instr
*chan_intr
=
44 nir_intrinsic_instr_create(b
->shader
, intr
->intrinsic
);
45 nir_ssa_dest_init(&chan_intr
->instr
, &chan_intr
->dest
,
46 1, intr
->dest
.ssa
.bit_size
, NULL
);
47 chan_intr
->num_components
= 1;
49 nir_intrinsic_set_base(chan_intr
, nir_intrinsic_base(intr
));
50 nir_intrinsic_set_component(chan_intr
, nir_intrinsic_component(intr
) + i
);
52 nir_src_copy(&chan_intr
->src
[0], &intr
->src
[0], chan_intr
);
54 nir_builder_instr_insert(b
, &chan_intr
->instr
);
56 loads
[i
] = &chan_intr
->dest
.ssa
;
59 nir_ssa_def_rewrite_uses(&intr
->dest
.ssa
,
60 nir_src_for_ssa(nir_vec(b
, loads
,
61 intr
->num_components
)));
62 nir_instr_remove(&intr
->instr
);
66 lower_store_output_to_scalar(nir_builder
*b
, nir_intrinsic_instr
*intr
)
68 b
->cursor
= nir_before_instr(&intr
->instr
);
70 nir_ssa_def
*value
= nir_ssa_for_src(b
, intr
->src
[0], intr
->num_components
);
72 for (unsigned i
= 0; i
< intr
->num_components
; i
++) {
73 if (!(nir_intrinsic_write_mask(intr
) & (1 << i
)))
76 nir_intrinsic_instr
*chan_intr
=
77 nir_intrinsic_instr_create(b
->shader
, intr
->intrinsic
);
78 chan_intr
->num_components
= 1;
80 nir_intrinsic_set_base(chan_intr
, nir_intrinsic_base(intr
));
81 nir_intrinsic_set_write_mask(chan_intr
, 0x1);
82 nir_intrinsic_set_component(chan_intr
, nir_intrinsic_component(intr
) + i
);
85 chan_intr
->src
[0] = nir_src_for_ssa(nir_channel(b
, value
, i
));
87 nir_src_copy(&chan_intr
->src
[1], &intr
->src
[1], chan_intr
);
89 nir_builder_instr_insert(b
, &chan_intr
->instr
);
92 nir_instr_remove(&intr
->instr
);
96 nir_lower_io_to_scalar(nir_shader
*shader
, nir_variable_mode mask
)
98 nir_foreach_function(function
, shader
) {
101 nir_builder_init(&b
, function
->impl
);
103 nir_foreach_block(block
, function
->impl
) {
104 nir_foreach_instr_safe(instr
, block
) {
105 if (instr
->type
!= nir_instr_type_intrinsic
)
108 nir_intrinsic_instr
*intr
= nir_instr_as_intrinsic(instr
);
110 if (intr
->num_components
== 1)
113 switch (intr
->intrinsic
) {
114 case nir_intrinsic_load_input
:
115 if (mask
& nir_var_shader_in
)
116 lower_load_input_to_scalar(&b
, intr
);
118 case nir_intrinsic_store_output
:
119 if (mask
& nir_var_shader_out
)
120 lower_store_output_to_scalar(&b
, intr
);