Mesa (master): glsl: Add a pass to flip matrix/ vector multiplies to use dot products.
Kenneth Graunke
kwg at kemper.freedesktop.org
Mon May 13 06:38:38 UTC 2013
Module: Mesa
Branch: master
Commit: e413d3f15ca72b82ca29e43f010597a83427d5e8
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=e413d3f15ca72b82ca29e43f010597a83427d5e8
Author: Kenneth Graunke <kenneth at whitecape.org>
Date: Wed Apr 17 17:30:25 2013 -0700
glsl: Add a pass to flip matrix/vector multiplies to use dot products.
This pass flips (matrix * vector) operations to (vector *
matrixTranspose) for certain built-in matrices (currently
gl_ModelViewProjectionMatrix and gl_TextureMatrix).
This is equivalent, but results in dot products rather than multiplies
and adds. On some hardware, this is more efficient.
This pass is conditionalized on ctx->mvp_with_dp4, the flag drivers set
to indicate they prefer dot products.
Improves performance in Lightsmark by 1.01131% +/- 0.162069% (n = 10)
on a Haswell GT2 system. Passes Piglit on Ivybridge.
v2: Use struct gl_shader_compiler_options instead of plumbing through
another boolean flag for this purpose.
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Eric Anholt <eric at anholt.net>
---
src/glsl/Makefile.sources | 1 +
src/glsl/glsl_parser_extras.cpp | 4 +
src/glsl/ir_optimization.h | 1 +
src/glsl/opt_flip_matrices.cpp | 122 +++++++++++++++++++++++++++++++++++++++
4 files changed, 128 insertions(+), 0 deletions(-)
diff --git a/src/glsl/Makefile.sources b/src/glsl/Makefile.sources
index 674a05f..df03cf8 100644
--- a/src/glsl/Makefile.sources
+++ b/src/glsl/Makefile.sources
@@ -82,6 +82,7 @@ LIBGLSL_FILES = \
$(GLSL_SRCDIR)/opt_dead_code_local.cpp \
$(GLSL_SRCDIR)/opt_dead_functions.cpp \
$(GLSL_SRCDIR)/opt_flatten_nested_if_blocks.cpp \
+ $(GLSL_SRCDIR)/opt_flip_matrices.cpp \
$(GLSL_SRCDIR)/opt_function_inlining.cpp \
$(GLSL_SRCDIR)/opt_if_simplification.cpp \
$(GLSL_SRCDIR)/opt_noop_swizzle.cpp \
diff --git a/src/glsl/glsl_parser_extras.cpp b/src/glsl/glsl_parser_extras.cpp
index 4e496a1..a6e6dde 100644
--- a/src/glsl/glsl_parser_extras.cpp
+++ b/src/glsl/glsl_parser_extras.cpp
@@ -1224,6 +1224,10 @@ do_common_optimization(exec_list *ir, bool linked,
progress = opt_flatten_nested_if_blocks(ir) || progress;
progress = do_copy_propagation(ir) || progress;
progress = do_copy_propagation_elements(ir) || progress;
+
+ if (options->PreferDP4 && !linked)
+ progress = opt_flip_matrices(ir) || progress;
+
if (linked)
progress = do_dead_code(ir, uniform_locations_assigned) || progress;
else
diff --git a/src/glsl/ir_optimization.h b/src/glsl/ir_optimization.h
index 9d28e91..28093cf 100644
--- a/src/glsl/ir_optimization.h
+++ b/src/glsl/ir_optimization.h
@@ -80,6 +80,7 @@ bool do_dead_code(exec_list *instructions, bool uniform_locations_assigned);
bool do_dead_code_local(exec_list *instructions);
bool do_dead_code_unlinked(exec_list *instructions);
bool do_dead_functions(exec_list *instructions);
+bool opt_flip_matrices(exec_list *instructions);
bool do_function_inlining(exec_list *instructions);
bool do_lower_jumps(exec_list *instructions, bool pull_out_jumps = true, bool lower_sub_return = true, bool lower_main_return = false, bool lower_continue = false, bool lower_break = false);
bool do_lower_texture_projection(exec_list *instructions);
diff --git a/src/glsl/opt_flip_matrices.cpp b/src/glsl/opt_flip_matrices.cpp
new file mode 100644
index 0000000..497513f
--- /dev/null
+++ b/src/glsl/opt_flip_matrices.cpp
@@ -0,0 +1,122 @@
+/*
+ * Copyright © 2013 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.
+ */
+
+/**
+ * \file opt_flip_matrices.cpp
+ *
+ * Convert (matrix * vector) operations to (vector * matrixTranspose),
+ * which can be done using dot products rather than multiplies and adds.
+ * On some hardware, this is more efficient.
+ *
+ * This currently only does the conversion for built-in matrices which
+ * already have transposed equivalents. Namely, gl_ModelViewProjectionMatrix
+ * and gl_TextureMatrix.
+ */
+#include "ir.h"
+#include "ir_optimization.h"
+#include "main/macros.h"
+
+namespace {
+class matrix_flipper : public ir_hierarchical_visitor {
+public:
+ matrix_flipper(exec_list *instructions)
+ {
+ progress = false;
+ mvp_transpose = NULL;
+ texmat_transpose = NULL;
+
+ foreach_list(n, instructions) {
+ ir_instruction *ir = (ir_instruction *) n;
+ ir_variable *var = ir->as_variable();
+ if (!var)
+ continue;
+ if (strcmp(var->name, "gl_ModelViewProjectionMatrixTranspose") == 0)
+ mvp_transpose = var;
+ if (strcmp(var->name, "gl_TextureMatrixTranspose") == 0)
+ texmat_transpose = var;
+ }
+ }
+
+ ir_visitor_status visit_enter(ir_expression *ir);
+
+ bool progress;
+
+private:
+ ir_variable *mvp_transpose;
+ ir_variable *texmat_transpose;
+};
+}
+
+ir_visitor_status
+matrix_flipper::visit_enter(ir_expression *ir)
+{
+ if (ir->operation != ir_binop_mul ||
+ !ir->operands[0]->type->is_matrix() ||
+ !ir->operands[1]->type->is_vector())
+ return visit_continue;
+
+ ir_variable *mat_var = ir->operands[0]->variable_referenced();
+ if (!mat_var)
+ return visit_continue;
+
+ if (mvp_transpose &&
+ strcmp(mat_var->name, "gl_ModelViewProjectionMatrix") == 0) {
+ ir_dereference_variable *deref = ir->operands[0]->as_dereference_variable();
+ assert(deref && deref->var == mat_var);
+
+ void *mem_ctx = ralloc_parent(ir);
+
+ ir->operands[0] = ir->operands[1];
+ ir->operands[1] = new(mem_ctx) ir_dereference_variable(mvp_transpose);
+
+ progress = true;
+ } else if (texmat_transpose &&
+ strcmp(mat_var->name, "gl_TextureMatrix") == 0) {
+ ir_dereference_array *array_ref = ir->operands[0]->as_dereference_array();
+ assert(array_ref != NULL);
+ ir_dereference_variable *var_ref = array_ref->array->as_dereference_variable();
+ assert(var_ref && var_ref->var == mat_var);
+
+ ir->operands[0] = ir->operands[1];
+ ir->operands[1] = array_ref;
+
+ var_ref->var = texmat_transpose;
+
+ texmat_transpose->max_array_access =
+ MAX2(texmat_transpose->max_array_access, mat_var->max_array_access);
+
+ progress = true;
+ }
+
+ return visit_continue;
+}
+
+bool
+opt_flip_matrices(struct exec_list *instructions)
+{
+ matrix_flipper v(instructions);
+
+ visit_list_elements(&v, instructions);
+
+ return v.progress;
+}
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