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nir: Remove lower_to_source_mods

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Unused.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24450>
This commit is contained in:
Alyssa Rosenzweig
2023-08-01 10:32:24 -04:00
parent 61d24ea88c
commit f218a2c3df
3 changed files with 0 additions and 205 deletions
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1
src/compiler/nir/meson.build
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@@ -214,7 +214,6 @@ files_libnir = files(
'nir_lower_tex.c',
'nir_lower_texcoord_replace.c',
'nir_lower_texcoord_replace_late.c',
'nir_lower_to_source_mods.c',
'nir_lower_two_sided_color.c',
'nir_lower_undef_to_zero.c',
'nir_lower_vars_to_ssa.c',

9
src/compiler/nir/nir.h
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@@ -5846,15 +5846,6 @@ void nir_lower_bitmap(nir_shader *shader, const nir_lower_bitmap_options *option
bool nir_lower_atomics_to_ssbo(nir_shader *shader, unsigned offset_align_state);
typedef enum {
nir_lower_fabs_source_mods = 1 << 0,
nir_lower_fneg_source_mods = 1 << 1,
nir_lower_triop_abs = 1 << 2,
nir_lower_all_source_mods = (1 << 3) - 1
} nir_lower_to_source_mods_flags;
bool nir_lower_to_source_mods(nir_shader *shader, nir_lower_to_source_mods_flags options);
typedef enum {
nir_lower_gs_intrinsics_per_stream = 1 << 0,
nir_lower_gs_intrinsics_count_primitives = 1 << 1,

195
src/compiler/nir/nir_lower_to_source_mods.c
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@@ -1,195 +0,0 @@
/*
* Copyright © 2014 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 "nir_builder.h"
/*
* This pass lowers the neg, abs, and sat operations to source modifiers on
* ALU operations to make things nicer for the backend. It's just much
* easier to not have them when we're doing optimizations.
*/
static void
alu_src_consume_abs(nir_alu_src *src)
{
src->abs = true;
}
static void
alu_src_consume_negate(nir_alu_src *src)
{
/* If abs is set on the source, the negate goes away */
if (!src->abs)
src->negate = !src->negate;
}
static bool
nir_lower_to_source_mods_instr(nir_builder *b, nir_instr *instr,
void *data)
{
nir_lower_to_source_mods_flags options =
*((nir_lower_to_source_mods_flags*) data);
bool progress = false;
if (instr->type != nir_instr_type_alu)
return false;
nir_alu_instr *alu = nir_instr_as_alu(instr);
bool lower_abs = (nir_op_infos[alu->op].num_inputs < 3) ||
(options & nir_lower_triop_abs);
for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++) {
if (!alu->src[i].src.is_ssa)
continue;
if (alu->src[i].src.ssa->parent_instr->type != nir_instr_type_alu)
continue;
nir_alu_instr *parent = nir_instr_as_alu(alu->src[i].src.ssa->parent_instr);
if (parent->dest.saturate)
continue;
if (nir_alu_type_get_base_type(nir_op_infos[alu->op].input_types[i]) != nir_type_float)
continue;
if (!(parent->op == nir_op_fabs && (options & nir_lower_fabs_source_mods)) &&
!(parent->op == nir_op_fneg && (options & nir_lower_fneg_source_mods))) {
continue;
}
if (nir_src_bit_size(alu->src[i].src) == 64)
continue;
/* We can only do a rewrite if the source we are copying is SSA.
* Otherwise, moving the read might invalidly reorder reads/writes
* on a register.
*/
if (!parent->src[0].src.is_ssa)
continue;
if (!lower_abs && (parent->op == nir_op_fabs || parent->src[0].abs))
continue;
nir_instr_rewrite_src(instr, &alu->src[i].src, parent->src[0].src);
/* Apply any modifiers that come from the parent opcode */
if (parent->op == nir_op_fneg)
alu_src_consume_negate(&alu->src[i]);
if (parent->op == nir_op_fabs)
alu_src_consume_abs(&alu->src[i]);
/* Apply modifiers from the parent source */
if (parent->src[0].negate)
alu_src_consume_negate(&alu->src[i]);
if (parent->src[0].abs)
alu_src_consume_abs(&alu->src[i]);
for (int j = 0; j < 4; ++j) {
if (!nir_alu_instr_channel_used(alu, i, j))
continue;
alu->src[i].swizzle[j] = parent->src[0].swizzle[alu->src[i].swizzle[j]];
}
if (nir_ssa_def_is_unused(&parent->dest.dest.ssa))
nir_instr_remove(&parent->instr);
progress = true;
}
/* We've covered sources. Now we're going to try and saturate the
* destination if we can.
*/
if (!alu->dest.dest.is_ssa)
return progress;
if (nir_dest_bit_size(alu->dest.dest) == 64)
return progress;
/* We can only saturate float destinations */
if (nir_alu_type_get_base_type(nir_op_infos[alu->op].output_type) !=
nir_type_float)
return progress;
bool all_children_are_sat = true;
nir_foreach_use_including_if(child_src, &alu->dest.dest.ssa) {
if (child_src->is_if) {
all_children_are_sat = false;
break;
}
assert(child_src->is_ssa);
nir_instr *child = child_src->parent_instr;
if (child->type != nir_instr_type_alu) {
all_children_are_sat = false;
continue;
}
nir_alu_instr *child_alu = nir_instr_as_alu(child);
if (child_alu->src[0].negate || child_alu->src[0].abs) {
all_children_are_sat = false;
continue;
}
if (child_alu->op != nir_op_fsat) {
all_children_are_sat = false;
continue;
}
}
if (!all_children_are_sat)
return progress;
alu->dest.saturate = true;
progress = true;
nir_foreach_use(child_src, &alu->dest.dest.ssa) {
assert(child_src->is_ssa);
nir_alu_instr *child_alu = nir_instr_as_alu(child_src->parent_instr);
child_alu->op = nir_op_mov;
child_alu->dest.saturate = false;
/* We could propagate the dest of our instruction to the
* destinations of the uses here. However, one quick round of
* copy propagation will clean that all up and then we don't have
* the complexity.
*/
}
return progress;
}
bool
nir_lower_to_source_mods(nir_shader *shader,
nir_lower_to_source_mods_flags options)
{
return nir_shader_instructions_pass(shader,
nir_lower_to_source_mods_instr,
nir_metadata_block_index |
nir_metadata_dominance,
&options);
}