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edc52a8f28
GLBenchmark 2.7's shaders contain conditional blocks like:
if (x) {
if (y) {
...
}
}
where the outer conditional's then clause contains exactly one statement
(the nested if) and there are no else clauses. This can easily be
optimized into:
if (x && y) {
...
}
This saves a few instructions in GLBenchmark 2.7:
total instructions in shared programs: 11833 -> 11649 (-1.55%)
instructions in affected programs: 8234 -> 8050 (-2.23%)
It also helps CS:GO slightly (-0.05%/-0.22%). More importantly,
however, it simplifies the control flow graph, which could enable other
optimizations.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
114 lines
5 KiB
C
114 lines
5 KiB
C
/*
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* Copyright © 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file ir_optimization.h
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*
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* Prototypes for optimization passes to be called by the compiler and drivers.
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*/
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/* Operations for lower_instructions() */
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#define SUB_TO_ADD_NEG 0x01
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#define DIV_TO_MUL_RCP 0x02
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#define EXP_TO_EXP2 0x04
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#define POW_TO_EXP2 0x08
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#define LOG_TO_LOG2 0x10
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#define MOD_TO_FRACT 0x20
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#define INT_DIV_TO_MUL_RCP 0x40
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#define LRP_TO_ARITH 0x80
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/**
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* \see class lower_packing_builtins_visitor
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*/
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enum lower_packing_builtins_op {
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LOWER_PACK_UNPACK_NONE = 0x0000,
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LOWER_PACK_SNORM_2x16 = 0x0001,
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LOWER_UNPACK_SNORM_2x16 = 0x0002,
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LOWER_PACK_UNORM_2x16 = 0x0004,
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LOWER_UNPACK_UNORM_2x16 = 0x0008,
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LOWER_PACK_HALF_2x16 = 0x0010,
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LOWER_UNPACK_HALF_2x16 = 0x0020,
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LOWER_PACK_HALF_2x16_TO_SPLIT = 0x0040,
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LOWER_UNPACK_HALF_2x16_TO_SPLIT = 0x0080,
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LOWER_PACK_SNORM_4x8 = 0x0100,
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LOWER_UNPACK_SNORM_4x8 = 0x0200,
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LOWER_PACK_UNORM_4x8 = 0x0400,
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LOWER_UNPACK_UNORM_4x8 = 0x0800,
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};
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bool do_common_optimization(exec_list *ir, bool linked,
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bool uniform_locations_assigned,
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unsigned max_unroll_iterations);
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bool do_algebraic(exec_list *instructions);
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bool do_constant_folding(exec_list *instructions);
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bool do_constant_variable(exec_list *instructions);
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bool do_constant_variable_unlinked(exec_list *instructions);
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bool do_copy_propagation(exec_list *instructions);
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bool do_copy_propagation_elements(exec_list *instructions);
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bool do_constant_propagation(exec_list *instructions);
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bool do_dead_code(exec_list *instructions, bool uniform_locations_assigned);
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bool do_dead_code_local(exec_list *instructions);
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bool do_dead_code_unlinked(exec_list *instructions);
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bool do_dead_functions(exec_list *instructions);
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bool do_function_inlining(exec_list *instructions);
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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);
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bool do_lower_texture_projection(exec_list *instructions);
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bool do_if_simplification(exec_list *instructions);
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bool opt_flatten_nested_if_blocks(exec_list *instructions);
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bool do_discard_simplification(exec_list *instructions);
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bool lower_if_to_cond_assign(exec_list *instructions, unsigned max_depth = 0);
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bool do_mat_op_to_vec(exec_list *instructions);
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bool do_noop_swizzle(exec_list *instructions);
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bool do_structure_splitting(exec_list *instructions);
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bool do_swizzle_swizzle(exec_list *instructions);
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bool do_tree_grafting(exec_list *instructions);
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bool do_vec_index_to_cond_assign(exec_list *instructions);
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bool do_vec_index_to_swizzle(exec_list *instructions);
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bool lower_discard(exec_list *instructions);
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void lower_discard_flow(exec_list *instructions);
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bool lower_instructions(exec_list *instructions, unsigned what_to_lower);
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bool lower_noise(exec_list *instructions);
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bool lower_variable_index_to_cond_assign(exec_list *instructions,
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bool lower_input, bool lower_output, bool lower_temp, bool lower_uniform);
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bool lower_quadop_vector(exec_list *instructions, bool dont_lower_swz);
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bool lower_clip_distance(gl_shader *shader);
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void lower_output_reads(exec_list *instructions);
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bool lower_packing_builtins(exec_list *instructions, int op_mask);
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void lower_ubo_reference(struct gl_shader *shader, exec_list *instructions);
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void lower_packed_varyings(void *mem_ctx, unsigned location_base,
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unsigned locations_used, ir_variable_mode mode,
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gl_shader *shader);
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bool optimize_redundant_jumps(exec_list *instructions);
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bool optimize_split_arrays(exec_list *instructions, bool linked);
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ir_rvalue *
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compare_index_block(exec_list *instructions, ir_variable *index,
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unsigned base, unsigned components, void *mem_ctx);
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