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/*
* Copyright © 2019 Intel Corporation
*
* 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 "util/bitset.h"
static void
set_type(unsigned idx, nir_alu_type type, BITSET_WORD *float_types,
BITSET_WORD *int_types, bool *progress)
{
switch (nir_alu_type_get_base_type(type)) {
case nir_type_bool:
case nir_type_int:
case nir_type_uint:
if (int_types && !BITSET_TEST(int_types, idx)) {
*progress = true;
BITSET_SET(int_types, idx);
}
break;
case nir_type_float:
if (float_types && !BITSET_TEST(float_types, idx)) {
*progress = true;
BITSET_SET(float_types, idx);
}
break;
default:
unreachable("Invalid base nir_alu_type");
}
}
static void
copy_type(unsigned src, unsigned dst, bool src_is_sink,
BITSET_WORD *types, bool *progress)
{
if (!types)
return;
if (BITSET_TEST(types, dst)) {
if (BITSET_TEST(types, src))
return;
BITSET_SET(types, src);
*progress = true;
} else if (BITSET_TEST(types, src) && !src_is_sink) {
BITSET_SET(types, dst);
*progress = true;
}
}
static void
copy_types(nir_src src, nir_dest *dest, BITSET_WORD *float_types,
BITSET_WORD *int_types, bool *progress)
{
bool src_is_sink = nir_src_is_const(src) ||
src.ssa->parent_instr->type == nir_instr_type_ssa_undef;
copy_type(src.ssa->index, dest->ssa.index, src_is_sink, float_types, progress);
copy_type(src.ssa->index, dest->ssa.index, src_is_sink, int_types, progress);
}
/** Gather up ALU types for SSA values
*
* This pass attempts to determine, for each SSA value, the type of data (int
* or float) that will be stored in it. The pass is greedy in the sense that
* it just assigns intness or floatness to types without any attempt to sort
* out the interesting cases where a given type may be both.
*
* The output of the pass is a pair of bitsets which has the intness or
* floatness of each SSA value recorded by index. It is the responsibility of
* the caller to index the SSA defs using nir_index_ssa_defs and allocate the
* bitsets. Either bitset is allowed to be NULL in which case no data is
* recorded for that type.
*/
void
nir_gather_ssa_types(nir_function_impl *impl,
BITSET_WORD *float_types,
BITSET_WORD *int_types)
{
bool progress;
do {
progress = false;
nir_foreach_block(block, impl) {
nir_foreach_instr(instr, block) {
switch (instr->type) {
case nir_instr_type_alu: {
nir_alu_instr *alu = nir_instr_as_alu(instr);
assert(alu->dest.dest.is_ssa);
const nir_op_info *info = &nir_op_infos[alu->op];
switch (alu->op) {
case nir_op_mov:
case nir_op_vec2:
case nir_op_vec3:
case nir_op_vec4:
for (unsigned i = 0; i < info->num_inputs; i++) {
copy_types(alu->src[i].src, &alu->dest.dest,
float_types, int_types, &progress);
}
break;
case nir_op_bcsel:
case nir_op_b32csel:
set_type(alu->src[0].src.ssa->index, nir_type_bool,
float_types, int_types, &progress);
copy_types(alu->src[1].src, &alu->dest.dest,
float_types, int_types, &progress);
copy_types(alu->src[2].src, &alu->dest.dest,
float_types, int_types, &progress);
break;
default:
for (unsigned i = 0; i < info->num_inputs; i++) {
assert(alu->src[i].src.is_ssa);
set_type(alu->src[i].src.ssa->index, info->input_types[i],
float_types, int_types, &progress);
}
set_type(alu->dest.dest.ssa.index, info->output_type,
float_types, int_types, &progress);
}
break;
}
case nir_instr_type_tex: {
nir_tex_instr *tex = nir_instr_as_tex(instr);
for (unsigned i = 0; i < tex->num_srcs; i++) {
assert(tex->src[i].src.is_ssa);
set_type(tex->src[i].src.ssa->index,
nir_tex_instr_src_type(tex, i),
float_types, int_types, &progress);
}
assert(tex->dest.is_ssa);
set_type(tex->dest.ssa.index, tex->dest_type,
float_types, int_types, &progress);
break;
}
case nir_instr_type_intrinsic: {
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
/* We could go nuts here, but we'll just handle a few simple
* cases and let everything else be untyped.
*/
switch (intrin->intrinsic) {
case nir_intrinsic_load_deref: {
nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]);
assert(intrin->dest.is_ssa);
set_type(intrin->dest.ssa.index,
nir_get_nir_type_for_glsl_type(deref->type),
float_types, int_types, &progress);
break;
}
case nir_intrinsic_store_deref: {
nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]);
assert(intrin->src[1].is_ssa);
set_type(intrin->src[1].ssa->index,
nir_get_nir_type_for_glsl_type(deref->type),
float_types, int_types, &progress);
break;
}
case nir_intrinsic_load_input:
case nir_intrinsic_load_uniform:
assert(intrin->dest.is_ssa);
set_type(intrin->dest.ssa.index,
nir_intrinsic_type(intrin),
float_types, int_types, &progress);
break;
case nir_intrinsic_store_output:
assert(intrin->src[0].is_ssa);
set_type(intrin->src[0].ssa->index,
nir_intrinsic_type(intrin),
float_types, int_types, &progress);
break;
default:
break;
}
/* For the most part, we leave other intrinsics alone. Most
* of them don't matter in OpenGL ES 2.0 drivers anyway.
* However, we should at least check if this is some sort of
* IO intrinsic and flag it's offset and index sources.
*/
nir_src *offset_src = nir_get_io_offset_src(intrin);
if (offset_src) {
assert(offset_src->is_ssa);
set_type(offset_src->ssa->index, nir_type_int,
float_types, int_types, &progress);
}
break;
}
case nir_instr_type_phi: {
nir_phi_instr *phi = nir_instr_as_phi(instr);
assert(phi->dest.is_ssa);
nir_foreach_phi_src(src, phi) {
copy_types(src->src, &phi->dest,
float_types, int_types, &progress);
}
break;
}
default:
break;
}
}
}
} while (progress);
}
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