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/*
* Copyright © 2014-2015 Broadcom
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "nir.h"
#include "nir_builder.h"
/** @file nir_lower_alu_to_scalar.c
*
* Replaces nir_alu_instr operations with more than one channel used in the
* arguments with individual per-channel operations.
*/
static void
nir_alu_ssa_dest_init(nir_alu_instr *instr, unsigned num_components)
{
nir_ssa_dest_init(&instr->instr, &instr->dest.dest, num_components, NULL);
instr->dest.write_mask = (1 << num_components) - 1;
}
static void
lower_reduction(nir_alu_instr *instr, nir_op chan_op, nir_op merge_op,
nir_builder *builder)
{
unsigned num_components = nir_op_infos[instr->op].input_sizes[0];
nir_ssa_def *last = NULL;
for (unsigned i = 0; i < num_components; i++) {
nir_alu_instr *chan = nir_alu_instr_create(builder->shader, chan_op);
nir_alu_ssa_dest_init(chan, 1);
nir_alu_src_copy(&chan->src[0], &instr->src[0], chan);
chan->src[0].swizzle[0] = chan->src[0].swizzle[i];
if (nir_op_infos[chan_op].num_inputs > 1) {
assert(nir_op_infos[chan_op].num_inputs == 2);
nir_alu_src_copy(&chan->src[1], &instr->src[1], chan);
chan->src[1].swizzle[0] = chan->src[1].swizzle[i];
}
nir_builder_instr_insert(builder, &chan->instr);
if (i == 0) {
last = &chan->dest.dest.ssa;
} else {
last = nir_build_alu(builder, merge_op,
last, &chan->dest.dest.ssa, NULL, NULL);
}
}
assert(instr->dest.write_mask == 1);
nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(last));
nir_instr_remove(&instr->instr);
}
static void
lower_alu_instr_scalar(nir_alu_instr *instr, nir_builder *b)
{
unsigned num_src = nir_op_infos[instr->op].num_inputs;
unsigned i, chan;
assert(instr->dest.dest.is_ssa);
assert(instr->dest.write_mask != 0);
b->cursor = nir_before_instr(&instr->instr);
#define LOWER_REDUCTION(name, chan, merge) \
case name##2: \
case name##3: \
case name##4: \
lower_reduction(instr, chan, merge, b); \
return;
switch (instr->op) {
case nir_op_vec4:
case nir_op_vec3:
case nir_op_vec2:
/* We don't need to scalarize these ops, they're the ones generated to
* group up outputs into a value that can be SSAed.
*/
return;
case nir_op_unpack_unorm_4x8:
case nir_op_unpack_snorm_4x8:
case nir_op_unpack_unorm_2x16:
case nir_op_unpack_snorm_2x16:
/* There is no scalar version of these ops, unless we were to break it
* down to bitshifts and math (which is definitely not intended).
*/
return;
case nir_op_unpack_half_2x16:
/* We could split this into unpack_half_2x16_split_[xy], but should
* we?
*/
return;
case nir_op_fdph: {
nir_ssa_def *sum[4];
for (unsigned i = 0; i < 3; i++) {
sum[i] = nir_fmul(b, nir_channel(b, instr->src[0].src.ssa,
instr->src[0].swizzle[i]),
nir_channel(b, instr->src[1].src.ssa,
instr->src[1].swizzle[i]));
}
sum[3] = nir_channel(b, instr->src[1].src.ssa, instr->src[1].swizzle[3]);
nir_ssa_def *val = nir_fadd(b, nir_fadd(b, sum[0], sum[1]),
nir_fadd(b, sum[2], sum[3]));
nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(val));
nir_instr_remove(&instr->instr);
return;
}
LOWER_REDUCTION(nir_op_fdot, nir_op_fmul, nir_op_fadd);
LOWER_REDUCTION(nir_op_ball_fequal, nir_op_feq, nir_op_iand);
LOWER_REDUCTION(nir_op_ball_iequal, nir_op_ieq, nir_op_iand);
LOWER_REDUCTION(nir_op_bany_fnequal, nir_op_fne, nir_op_ior);
LOWER_REDUCTION(nir_op_bany_inequal, nir_op_ine, nir_op_ior);
LOWER_REDUCTION(nir_op_fall_equal, nir_op_seq, nir_op_fand);
LOWER_REDUCTION(nir_op_fany_nequal, nir_op_sne, nir_op_for);
default:
break;
}
if (instr->dest.dest.ssa.num_components == 1)
return;
unsigned num_components = instr->dest.dest.ssa.num_components;
nir_ssa_def *comps[] = { NULL, NULL, NULL, NULL };
for (chan = 0; chan < 4; chan++) {
if (!(instr->dest.write_mask & (1 << chan)))
continue;
nir_alu_instr *lower = nir_alu_instr_create(b->shader, instr->op);
for (i = 0; i < num_src; i++) {
/* We only handle same-size-as-dest (input_sizes[] == 0) or scalar
* args (input_sizes[] == 1).
*/
assert(nir_op_infos[instr->op].input_sizes[i] < 2);
unsigned src_chan = (nir_op_infos[instr->op].input_sizes[i] == 1 ?
0 : chan);
nir_alu_src_copy(&lower->src[i], &instr->src[i], lower);
for (int j = 0; j < 4; j++)
lower->src[i].swizzle[j] = instr->src[i].swizzle[src_chan];
}
nir_alu_ssa_dest_init(lower, 1);
lower->dest.saturate = instr->dest.saturate;
comps[chan] = &lower->dest.dest.ssa;
nir_builder_instr_insert(b, &lower->instr);
}
nir_ssa_def *vec = nir_vec(b, comps, num_components);
nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(vec));
nir_instr_remove(&instr->instr);
}
static bool
lower_alu_to_scalar_block(nir_block *block, void *builder)
{
nir_foreach_instr_safe(block, instr) {
if (instr->type == nir_instr_type_alu)
lower_alu_instr_scalar(nir_instr_as_alu(instr), builder);
}
return true;
}
static void
nir_lower_alu_to_scalar_impl(nir_function_impl *impl)
{
nir_builder builder;
nir_builder_init(&builder, impl);
nir_foreach_block(impl, lower_alu_to_scalar_block, &builder);
}
void
nir_lower_alu_to_scalar(nir_shader *shader)
{
nir_foreach_overload(shader, overload) {
if (overload->impl)
nir_lower_alu_to_scalar_impl(overload->impl);
}
}
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