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authorNicolai Hähnle <[email protected]>2017-05-20 17:58:25 +0200
committerNicolai Hähnle <[email protected]>2017-07-31 14:55:29 +0200
commite902ac326839e7720d4e1d9a19d0a9a1aa817f04 (patch)
treead90d19804b19ed0ba42115a9412a06b0ceb2987 /src
parentbce6f9987522ebb585571f7333d47e41e1dead9b (diff)
nir: add nir_lower_uniforms_to_ubo pass
This is a further lowering of default-block uniform loads that transforms load_uniform intrinsics into load_ubo intrinsics. This simplifies the rest of the backend. v2: transform from load_uniform instead of straight from variables Reviewed-by: Eric Anholt <[email protected]>
Diffstat (limited to 'src')
-rw-r--r--src/compiler/Makefile.sources1
-rw-r--r--src/compiler/nir/nir.h1
-rw-r--r--src/compiler/nir/nir_lower_uniforms_to_ubo.c97
3 files changed, 99 insertions, 0 deletions
diff --git a/src/compiler/Makefile.sources b/src/compiler/Makefile.sources
index 4f4406fe0ed..a56a7103515 100644
--- a/src/compiler/Makefile.sources
+++ b/src/compiler/Makefile.sources
@@ -238,6 +238,7 @@ NIR_FILES = \
nir/nir_lower_tex.c \
nir/nir_lower_to_source_mods.c \
nir/nir_lower_two_sided_color.c \
+ nir/nir_lower_uniforms_to_ubo.c \
nir/nir_lower_vars_to_ssa.c \
nir/nir_lower_var_copies.c \
nir/nir_lower_vec_to_movs.c \
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index b6c6923627c..9313b7ac907 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2581,6 +2581,7 @@ void nir_lower_bitmap(nir_shader *shader, const nir_lower_bitmap_options *option
bool nir_lower_atomics(nir_shader *shader,
const struct gl_shader_program *shader_program);
bool nir_lower_atomics_to_ssbo(nir_shader *shader, unsigned ssbo_offset);
+bool nir_lower_uniforms_to_ubo(nir_shader *shader);
bool nir_lower_to_source_mods(nir_shader *shader);
bool nir_lower_gs_intrinsics(nir_shader *shader);
diff --git a/src/compiler/nir/nir_lower_uniforms_to_ubo.c b/src/compiler/nir/nir_lower_uniforms_to_ubo.c
new file mode 100644
index 00000000000..15bf0d9857a
--- /dev/null
+++ b/src/compiler/nir/nir_lower_uniforms_to_ubo.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2017 Advanced Micro Devices, Inc.
+ *
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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.
+ */
+
+/*
+ * Remap load_uniform intrinsics to UBO accesses of UBO binding point 0. Both
+ * the base and the offset are interpreted as 16-byte units.
+ *
+ * Simultaneously, remap existing UBO accesses by increasing their binding
+ * point by 1.
+ */
+
+#include "nir.h"
+#include "nir_builder.h"
+
+static bool
+lower_instr(nir_intrinsic_instr *instr, nir_builder *b)
+{
+ b->cursor = nir_before_instr(&instr->instr);
+
+ if (instr->intrinsic == nir_intrinsic_load_ubo) {
+ nir_ssa_def *old_idx = nir_ssa_for_src(b, instr->src[0], 1);
+ nir_ssa_def *new_idx = nir_iadd(b, old_idx, nir_imm_int(b, 1));
+ nir_instr_rewrite_src(&instr->instr, &instr->src[0],
+ nir_src_for_ssa(new_idx));
+ return true;
+ }
+
+ if (instr->intrinsic == nir_intrinsic_load_uniform) {
+ nir_ssa_def *ubo_idx = nir_imm_int(b, 0);
+ nir_ssa_def *ubo_offset =
+ nir_imul(b, nir_imm_int(b, 16),
+ nir_iadd(b, nir_imm_int(b, nir_intrinsic_base(instr)),
+ nir_ssa_for_src(b, instr->src[0], 1)));
+
+ nir_intrinsic_instr *load =
+ nir_intrinsic_instr_create(b->shader, nir_intrinsic_load_ubo);
+ load->num_components = instr->num_components;
+ load->src[0] = nir_src_for_ssa(ubo_idx);
+ load->src[1] = nir_src_for_ssa(ubo_offset);
+ nir_ssa_dest_init(&load->instr, &load->dest,
+ load->num_components, instr->dest.ssa.bit_size,
+ instr->dest.ssa.name);
+ nir_builder_instr_insert(b, &load->instr);
+ nir_ssa_def_rewrite_uses(&instr->dest.ssa, nir_src_for_ssa(&load->dest.ssa));
+
+ nir_instr_remove(&instr->instr);
+ return true;
+ }
+
+ return false;
+}
+
+bool
+nir_lower_uniforms_to_ubo(nir_shader *shader)
+{
+ bool progress = false;
+
+ nir_foreach_function(function, shader) {
+ if (function->impl) {
+ nir_builder builder;
+ nir_builder_init(&builder, function->impl);
+ nir_foreach_block(block, function->impl) {
+ nir_foreach_instr_safe(instr, block) {
+ if (instr->type == nir_instr_type_intrinsic)
+ progress |= lower_instr(nir_instr_as_intrinsic(instr),
+ &builder);
+ }
+ }
+
+ nir_metadata_preserve(function->impl, nir_metadata_block_index |
+ nir_metadata_dominance);
+ }
+ }
+
+ return progress;
+}
+