11591693c7b415e9869157c711fe11263c95d74eDavid Li/* 21591693c7b415e9869157c711fe11263c95d74eDavid Li * Copyright © 2010 Intel Corporation 31591693c7b415e9869157c711fe11263c95d74eDavid Li * 41591693c7b415e9869157c711fe11263c95d74eDavid Li * Permission is hereby granted, free of charge, to any person obtaining a 51591693c7b415e9869157c711fe11263c95d74eDavid Li * copy of this software and associated documentation files (the "Software"), 61591693c7b415e9869157c711fe11263c95d74eDavid Li * to deal in the Software without restriction, including without limitation 71591693c7b415e9869157c711fe11263c95d74eDavid Li * the rights to use, copy, modify, merge, publish, distribute, sublicense, 81591693c7b415e9869157c711fe11263c95d74eDavid Li * and/or sell copies of the Software, and to permit persons to whom the 91591693c7b415e9869157c711fe11263c95d74eDavid Li * Software is furnished to do so, subject to the following conditions: 101591693c7b415e9869157c711fe11263c95d74eDavid Li * 111591693c7b415e9869157c711fe11263c95d74eDavid Li * The above copyright notice and this permission notice (including the next 121591693c7b415e9869157c711fe11263c95d74eDavid Li * paragraph) shall be included in all copies or substantial portions of the 131591693c7b415e9869157c711fe11263c95d74eDavid Li * Software. 141591693c7b415e9869157c711fe11263c95d74eDavid Li * 151591693c7b415e9869157c711fe11263c95d74eDavid Li * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 161591693c7b415e9869157c711fe11263c95d74eDavid Li * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 171591693c7b415e9869157c711fe11263c95d74eDavid Li * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 181591693c7b415e9869157c711fe11263c95d74eDavid Li * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 191591693c7b415e9869157c711fe11263c95d74eDavid Li * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 201591693c7b415e9869157c711fe11263c95d74eDavid Li * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 211591693c7b415e9869157c711fe11263c95d74eDavid Li * DEALINGS IN THE SOFTWARE. 221591693c7b415e9869157c711fe11263c95d74eDavid Li */ 231591693c7b415e9869157c711fe11263c95d74eDavid Li 241591693c7b415e9869157c711fe11263c95d74eDavid Li/** 251591693c7b415e9869157c711fe11263c95d74eDavid Li * \file lower_noise.cpp 261591693c7b415e9869157c711fe11263c95d74eDavid Li * IR lower pass to remove noise opcodes. 271591693c7b415e9869157c711fe11263c95d74eDavid Li * 281591693c7b415e9869157c711fe11263c95d74eDavid Li * \author Ian Romanick <ian.d.romanick@intel.com> 291591693c7b415e9869157c711fe11263c95d74eDavid Li */ 301591693c7b415e9869157c711fe11263c95d74eDavid Li 311591693c7b415e9869157c711fe11263c95d74eDavid Li#include "ir.h" 321591693c7b415e9869157c711fe11263c95d74eDavid Li#include "ir_rvalue_visitor.h" 331591693c7b415e9869157c711fe11263c95d74eDavid Li 341591693c7b415e9869157c711fe11263c95d74eDavid Liclass lower_noise_visitor : public ir_rvalue_visitor { 351591693c7b415e9869157c711fe11263c95d74eDavid Lipublic: 361591693c7b415e9869157c711fe11263c95d74eDavid Li lower_noise_visitor() : progress(false) 371591693c7b415e9869157c711fe11263c95d74eDavid Li { 381591693c7b415e9869157c711fe11263c95d74eDavid Li /* empty */ 391591693c7b415e9869157c711fe11263c95d74eDavid Li } 401591693c7b415e9869157c711fe11263c95d74eDavid Li 411591693c7b415e9869157c711fe11263c95d74eDavid Li void handle_rvalue(ir_rvalue **rvalue) 421591693c7b415e9869157c711fe11263c95d74eDavid Li { 431591693c7b415e9869157c711fe11263c95d74eDavid Li if (!*rvalue) 441591693c7b415e9869157c711fe11263c95d74eDavid Li return; 451591693c7b415e9869157c711fe11263c95d74eDavid Li 461591693c7b415e9869157c711fe11263c95d74eDavid Li ir_expression *expr = (*rvalue)->as_expression(); 471591693c7b415e9869157c711fe11263c95d74eDavid Li if (!expr) 481591693c7b415e9869157c711fe11263c95d74eDavid Li return; 491591693c7b415e9869157c711fe11263c95d74eDavid Li 501591693c7b415e9869157c711fe11263c95d74eDavid Li /* In the future, ir_unop_noise may be replaced by a call to a function 511591693c7b415e9869157c711fe11263c95d74eDavid Li * that implements noise. No hardware has a noise instruction. 521591693c7b415e9869157c711fe11263c95d74eDavid Li */ 531591693c7b415e9869157c711fe11263c95d74eDavid Li if (expr->operation == ir_unop_noise) { 54d50d9a90a0df4d706421850e17c0fbd85bf710eeDavid Li *rvalue = ir_constant::zero(hieralloc_parent(expr), expr->type); 551591693c7b415e9869157c711fe11263c95d74eDavid Li this->progress = true; 561591693c7b415e9869157c711fe11263c95d74eDavid Li } 571591693c7b415e9869157c711fe11263c95d74eDavid Li } 581591693c7b415e9869157c711fe11263c95d74eDavid Li 591591693c7b415e9869157c711fe11263c95d74eDavid Li bool progress; 601591693c7b415e9869157c711fe11263c95d74eDavid Li}; 611591693c7b415e9869157c711fe11263c95d74eDavid Li 621591693c7b415e9869157c711fe11263c95d74eDavid Li 631591693c7b415e9869157c711fe11263c95d74eDavid Libool 641591693c7b415e9869157c711fe11263c95d74eDavid Lilower_noise(exec_list *instructions) 651591693c7b415e9869157c711fe11263c95d74eDavid Li{ 661591693c7b415e9869157c711fe11263c95d74eDavid Li lower_noise_visitor v; 671591693c7b415e9869157c711fe11263c95d74eDavid Li 681591693c7b415e9869157c711fe11263c95d74eDavid Li visit_list_elements(&v, instructions); 691591693c7b415e9869157c711fe11263c95d74eDavid Li 701591693c7b415e9869157c711fe11263c95d74eDavid Li return v.progress; 711591693c7b415e9869157c711fe11263c95d74eDavid Li} 72