diff options
author | Ian Romanick <ian.d.romanick@intel.com> | 2010-08-16 19:08:53 -0700 |
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committer | Ian Romanick <ian.d.romanick@intel.com> | 2010-08-16 19:08:53 -0700 |
commit | 6c03c576cc49bbb008de66d374f4302ff0fe0390 (patch) | |
tree | 7ddeb3ee88532d9aef8728b9aa256edf7c125247 /src/glsl/ir_mod_to_fract.cpp | |
parent | 15a3b42e135a3a2cb463ec3cff80a55dd8528051 (diff) | |
parent | a433cd286c60eb9d4c2114f042709eda0f3de676 (diff) |
Merge branch 'glsl2'
Conflicts:
src/mesa/program/prog_optimize.c
Diffstat (limited to 'src/glsl/ir_mod_to_fract.cpp')
-rw-r--r-- | src/glsl/ir_mod_to_fract.cpp | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/src/glsl/ir_mod_to_fract.cpp b/src/glsl/ir_mod_to_fract.cpp new file mode 100644 index 0000000000..71c9472b12 --- /dev/null +++ b/src/glsl/ir_mod_to_fract.cpp @@ -0,0 +1,90 @@ +/* + * Copyright © 2010 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 ir_mod_to_floor.cpp + * + * Breaks an ir_unop_mod expression down to (op1 * fract(op0 / op1)) + * + * Many GPUs don't have a MOD instruction (945 and 965 included), and + * if we have to break it down like this anyway, it gives an + * opportunity to do things like constant fold the (1.0 / op1) easily. + */ + +#include "ir.h" + +class ir_mod_to_fract_visitor : public ir_hierarchical_visitor { +public: + ir_mod_to_fract_visitor() + { + this->made_progress = false; + } + + ir_visitor_status visit_leave(ir_expression *); + + bool made_progress; +}; + +bool +do_mod_to_fract(exec_list *instructions) +{ + ir_mod_to_fract_visitor v; + + visit_list_elements(&v, instructions); + return v.made_progress; +} + +ir_visitor_status +ir_mod_to_fract_visitor::visit_leave(ir_expression *ir) +{ + if (ir->operation != ir_binop_mod) + return visit_continue; + + ir_variable *temp = new(ir) ir_variable(ir->operands[1]->type, "mod_b", + ir_var_temporary); + this->base_ir->insert_before(temp); + + ir_assignment *assign; + ir_rvalue *expr; + + assign = new(ir) ir_assignment(new(ir) ir_dereference_variable(temp), + ir->operands[1], NULL); + this->base_ir->insert_before(assign); + + expr = new(ir) ir_expression(ir_binop_div, + ir->operands[0]->type, + ir->operands[0], + new(ir) ir_dereference_variable(temp)); + + expr = new(ir) ir_expression(ir_unop_fract, + ir->operands[0]->type, + expr, + NULL); + + ir->operation = ir_binop_mul; + ir->operands[0] = new(ir) ir_dereference_variable(temp); + ir->operands[1] = expr; + this->made_progress = true; + + return visit_continue; +} |