/* * 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 lower_noise.cpp * IR lower pass to remove noise opcodes. * * \author Ian Romanick <ian.d.romanick@intel.com> */ #include "ir.h" #include "ir_rvalue_visitor.h" class lower_noise_visitor : public ir_rvalue_visitor { public: lower_noise_visitor() : progress(false) { /* empty */ } void handle_rvalue(ir_rvalue **rvalue) { if (!*rvalue) return; ir_expression *expr = (*rvalue)->as_expression(); if (!expr) return; /* In the future, ir_unop_noise may be replaced by a call to a function * that implements noise. No hardware has a noise instruction. */ if (expr->operation == ir_unop_noise) { *rvalue = ir_constant::zero(talloc_parent(expr), expr->type); this->progress = true; } } bool progress; }; bool lower_noise(exec_list *instructions) { lower_noise_visitor v; visit_list_elements(&v, instructions); return v.progress; }