From 6dd0ad66dedc4cbd79574053f0b5023172935657 Mon Sep 17 00:00:00 2001 From: Vasily Khoruzhick Date: Sun, 22 Sep 2019 22:03:22 -0700 Subject: [PATCH] lima/ppir: add NIR pass to split varying loads NIR may emit a single instrinsic to load several packed varyings, but that's suboptimal for Utgard PP for several reasons: - varyings that are used as sampler inputs can be passed using pipeline register with increased precision - we have small number of regs, so using a vec4 regs for storing two vec2 varyings increases reg pressure. Add NIR pass to split a single load into several loads and utilize it in lima. Reviewed-by: Qiang Yu Signed-off-by: Vasily Khoruzhick --- src/gallium/drivers/lima/Android.mk | 1 + src/gallium/drivers/lima/ir/lima_ir.h | 1 + .../lima/ir/lima_nir_split_load_input.c | 123 ++++++++++++++++++ src/gallium/drivers/lima/lima_program.c | 1 + src/gallium/drivers/lima/meson.build | 1 + 5 files changed, 127 insertions(+) create mode 100644 src/gallium/drivers/lima/ir/lima_nir_split_load_input.c diff --git a/src/gallium/drivers/lima/Android.mk b/src/gallium/drivers/lima/Android.mk index c09789ec022..9408e96bd7d 100644 --- a/src/gallium/drivers/lima/Android.mk +++ b/src/gallium/drivers/lima/Android.mk @@ -36,6 +36,7 @@ LOCAL_SRC_FILES := \ ir/gp/scheduler.c \ ir/lima_ir.h \ ir/lima_nir_lower_uniform_to_scalar.c \ + ir/lima_nir_split_load_input.c \ ir/pp/codegen.c \ ir/pp/codegen.h \ ir/pp/disasm.c \ diff --git a/src/gallium/drivers/lima/ir/lima_ir.h b/src/gallium/drivers/lima/ir/lima_ir.h index a02aa932b76..b160dc96738 100644 --- a/src/gallium/drivers/lima/ir/lima_ir.h +++ b/src/gallium/drivers/lima/ir/lima_ir.h @@ -65,5 +65,6 @@ struct ra_regs *ppir_regalloc_init(void *mem_ctx); void lima_nir_lower_uniform_to_scalar(nir_shader *shader); bool lima_nir_scale_trig(nir_shader *shader); +bool lima_nir_split_load_input(nir_shader *shader); #endif diff --git a/src/gallium/drivers/lima/ir/lima_nir_split_load_input.c b/src/gallium/drivers/lima/ir/lima_nir_split_load_input.c new file mode 100644 index 00000000000..3c87a4847d1 --- /dev/null +++ b/src/gallium/drivers/lima/ir/lima_nir_split_load_input.c @@ -0,0 +1,123 @@ +/* + * Copyright © 2019 Vasily Khoruzhick + * + * 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" + +#include "lima_ir.h" + +static bool +lima_nir_split_load_input_block(nir_block *block, nir_builder *b) +{ + bool progress = false; + + nir_foreach_instr_safe(instr, block) { + if (instr->type != nir_instr_type_alu) + continue; + + nir_alu_instr *alu = nir_instr_as_alu(instr); + if (alu->op != nir_op_mov) + continue; + + if (!alu->dest.dest.is_ssa) + continue; + + if (!alu->src[0].src.is_ssa) + continue; + + nir_ssa_def *ssa = alu->src[0].src.ssa; + if (ssa->parent_instr->type != nir_instr_type_intrinsic) + continue; + + nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(ssa->parent_instr); + if (intrin->intrinsic != nir_intrinsic_load_input) + continue; + + uint8_t swizzle = alu->src[0].swizzle[0]; + int i; + + for (i = 1; i < nir_dest_num_components(alu->dest.dest); i++) + if (alu->src[0].swizzle[i] != (swizzle + i)) + break; + + if (i != nir_dest_num_components(alu->dest.dest)) + continue; + + b->cursor = nir_before_instr(&intrin->instr); + nir_intrinsic_instr *new_intrin = nir_intrinsic_instr_create( + b->shader, + intrin->intrinsic); + nir_ssa_dest_init(&new_intrin->instr, &new_intrin->dest, + nir_dest_num_components(alu->dest.dest), + ssa->bit_size, + NULL); + new_intrin->num_components = nir_dest_num_components(alu->dest.dest); + nir_intrinsic_set_base(new_intrin, nir_intrinsic_base(intrin)); + nir_intrinsic_set_component(new_intrin, nir_intrinsic_component(intrin) + swizzle); + nir_intrinsic_set_type(new_intrin, nir_intrinsic_type(intrin)); + + /* offset */ + nir_src_copy(&new_intrin->src[0], &intrin->src[0], new_intrin); + + nir_builder_instr_insert(b, &new_intrin->instr); + nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa, + nir_src_for_ssa(&new_intrin->dest.ssa)); + nir_instr_remove(&alu->instr); + progress = true; + } + + return progress; +} + +static bool +lima_nir_split_load_input_impl(nir_function_impl *impl) +{ + bool progress = false; + nir_builder builder; + nir_builder_init(&builder, impl); + + nir_foreach_block(block, impl) { + progress |= lima_nir_split_load_input_block(block, &builder); + } + + nir_metadata_preserve(impl, nir_metadata_block_index | + nir_metadata_dominance); + return progress; +} + +/* Replaces a single load of several packed varyings and number of movs with + * a number of loads of smaller size + */ +bool +lima_nir_split_load_input(nir_shader *shader) +{ + bool progress = false; + + nir_foreach_function(function, shader) { + if (function->impl) + progress |= lima_nir_split_load_input_impl(function->impl); + } + + return progress; +} + diff --git a/src/gallium/drivers/lima/lima_program.c b/src/gallium/drivers/lima/lima_program.c index 5e639748bfc..e1237642482 100644 --- a/src/gallium/drivers/lima/lima_program.c +++ b/src/gallium/drivers/lima/lima_program.c @@ -224,6 +224,7 @@ lima_program_optimize_fs_nir(struct nir_shader *s) nir_var_shader_in | nir_var_shader_out | nir_var_function_temp); + NIR_PASS(progress, s, lima_nir_split_load_input); } while (progress); NIR_PASS_V(s, nir_lower_int_to_float); diff --git a/src/gallium/drivers/lima/meson.build b/src/gallium/drivers/lima/meson.build index bf91c78856e..6fa5795e0d2 100644 --- a/src/gallium/drivers/lima/meson.build +++ b/src/gallium/drivers/lima/meson.build @@ -46,6 +46,7 @@ files_lima = files( 'ir/pp/disasm.c', 'ir/lima_nir_lower_uniform_to_scalar.c', + 'ir/lima_nir_split_load_input.c', 'ir/lima_ir.h', -- 2.30.2