1f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/* 2f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Copyright © 2010 Intel Corporation 3f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 4f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Permission is hereby granted, free of charge, to any person obtaining a 5f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * constant of this software and associated documentation files (the "Software"), 6f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * to deal in the Software without restriction, including without limitation 7f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * the rights to use, constant, modify, merge, publish, distribute, sublicense, 8f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * and/or sell copies of the Software, and to permit persons to whom the 9f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Software is furnished to do so, subject to the following conditions: 10f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 11f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * The above constantright notice and this permission notice (including the next 12f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * paragraph) shall be included in all copies or substantial portions of the 13f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Software. 14f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 15f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * THE AUTHORS OR CONSTANTRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * DEALINGS IN THE SOFTWARE. 22f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 23f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 24f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/** 25f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * \file opt_constant_propagation.cpp 26f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 27f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Tracks assignments of constants to channels of variables, and 28f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * usage of those constant channels with direct usage of the constants. 29f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 30f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * This can lead to constant folding and algebraic optimizations in 31f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * those later expressions, while causing no increase in instruction 32f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * count (due to constants being generally free to load from a 33f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * constant push buffer or as instruction immediate values) and 34f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * possibly reducing register pressure. 35f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 36f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 37f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "ir.h" 38f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "ir_visitor.h" 39f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "ir_rvalue_visitor.h" 40f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "ir_basic_block.h" 41f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "ir_optimization.h" 42f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "glsl_types.h" 43f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 44f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgnamespace { 45f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 46f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgclass acp_entry : public exec_node 47f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 48f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgpublic: 49f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org acp_entry(ir_variable *var, unsigned write_mask, ir_constant *constant) 50f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 51f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org assert(var); 52f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org assert(constant); 53f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->var = var; 54f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->write_mask = write_mask; 55f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->constant = constant; 56f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->initial_values = write_mask; 57f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 58f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 59f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org acp_entry(const acp_entry *src) 60f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 61f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->var = src->var; 62f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->write_mask = src->write_mask; 63f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->constant = src->constant; 64f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->initial_values = src->initial_values; 65f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 66f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 67f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_variable *var; 68f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_constant *constant; 69f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org unsigned write_mask; 70f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 71f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /** Mask of values initially available in the constant. */ 72f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org unsigned initial_values; 73f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org}; 74f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 75f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 76f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgclass kill_entry : public exec_node 77f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 78f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgpublic: 79f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org kill_entry(ir_variable *var, unsigned write_mask) 80f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 81f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org assert(var); 82f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->var = var; 83f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->write_mask = write_mask; 84f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 85f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 86f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_variable *var; 87f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org unsigned write_mask; 88f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org}; 89f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 90f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgclass ir_constant_propagation_visitor : public ir_rvalue_visitor { 91f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgpublic: 92f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_constant_propagation_visitor() 93f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 94f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org progress = false; 95f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org killed_all = false; 96f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org mem_ctx = ralloc_context(0); 97f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->acp = new(mem_ctx) exec_list; 98f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->kills = new(mem_ctx) exec_list; 99f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 100f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ~ir_constant_propagation_visitor() 101f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 102f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ralloc_free(mem_ctx); 103f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 104f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 105f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org virtual ir_visitor_status visit_enter(class ir_loop *); 106f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org virtual ir_visitor_status visit_enter(class ir_function_signature *); 107f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org virtual ir_visitor_status visit_enter(class ir_function *); 108f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org virtual ir_visitor_status visit_leave(class ir_assignment *); 109f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org virtual ir_visitor_status visit_enter(class ir_call *); 110f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org virtual ir_visitor_status visit_enter(class ir_if *); 111f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 112f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org void add_constant(ir_assignment *ir); 113f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org void kill(ir_variable *ir, unsigned write_mask); 114f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org void handle_if_block(exec_list *instructions); 115f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org void handle_rvalue(ir_rvalue **rvalue); 116f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 117f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /** List of acp_entry: The available constants to propagate */ 118f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *acp; 119f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 120f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /** 121f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * List of kill_entry: The masks of variables whose values were 122f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * killed in this block. 123f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 124f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *kills; 125f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 126f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org bool progress; 127f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 128f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org bool killed_all; 129f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 130f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org void *mem_ctx; 131f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org}; 132f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 133f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 134f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgvoid 135f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::handle_rvalue(ir_rvalue **rvalue) 136f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 137f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (this->in_assignee || !*rvalue) 138f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 139f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 140f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const glsl_type *type = (*rvalue)->type; 141f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!type->is_scalar() && !type->is_vector()) 142f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 143f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 144f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_swizzle *swiz = NULL; 145f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_dereference_variable *deref = (*rvalue)->as_dereference_variable(); 146f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!deref) { 147f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org swiz = (*rvalue)->as_swizzle(); 148f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!swiz) 149f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 150f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 151f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org deref = swiz->val->as_dereference_variable(); 152f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!deref) 153f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 154f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 155f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 156f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_constant_data data; 157f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org memset(&data, 0, sizeof(data)); 158f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 159f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (unsigned int i = 0; i < type->components(); i++) { 160f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org int channel; 161f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org acp_entry *found = NULL; 162f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 163f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (swiz) { 164f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org switch (i) { 165f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case 0: channel = swiz->mask.x; break; 166f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case 1: channel = swiz->mask.y; break; 167f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case 2: channel = swiz->mask.z; break; 168f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case 3: channel = swiz->mask.w; break; 169f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org default: assert(!"shouldn't be reached"); channel = 0; break; 170f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 171f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } else { 172f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org channel = i; 173f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 174f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 175f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org foreach_iter(exec_list_iterator, iter, *this->acp) { 176f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org acp_entry *entry = (acp_entry *)iter.get(); 177f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (entry->var == deref->var && entry->write_mask & (1 << channel)) { 178f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org found = entry; 179f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 180f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 181f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 182f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 183f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!found) 184f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 185f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 186f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org int rhs_channel = 0; 187f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (int j = 0; j < 4; j++) { 188f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (j == channel) 189f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 190f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (found->initial_values & (1 << j)) 191f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rhs_channel++; 192f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 193f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 194f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org switch (type->base_type) { 195f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GLSL_TYPE_FLOAT: 196f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org data.f[i] = found->constant->value.f[rhs_channel]; 197f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 198f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GLSL_TYPE_INT: 199f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org data.i[i] = found->constant->value.i[rhs_channel]; 200f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 201f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GLSL_TYPE_UINT: 202f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org data.u[i] = found->constant->value.u[rhs_channel]; 203f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 204f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GLSL_TYPE_BOOL: 205f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org data.b[i] = found->constant->value.b[rhs_channel]; 206f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 207f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org default: 208f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org assert(!"not reached"); 209f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 210f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 211f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 212f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 213f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org *rvalue = new(ralloc_parent(deref)) ir_constant(type, &data); 214f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->progress = true; 215f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 216f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 217f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_visitor_status 218f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::visit_enter(ir_function_signature *ir) 219f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 220f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* Treat entry into a function signature as a completely separate 221f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * block. Any instructions at global scope will be shuffled into 222f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * main() at link time, so they're irrelevant to us. 223f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 224f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *orig_acp = this->acp; 225f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *orig_kills = this->kills; 226f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org bool orig_killed_all = this->killed_all; 227f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 228f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->acp = new(mem_ctx) exec_list; 229f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->kills = new(mem_ctx) exec_list; 230f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->killed_all = false; 231f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 232f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org visit_list_elements(this, &ir->body); 233f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 234f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->kills = orig_kills; 235f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->acp = orig_acp; 236f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->killed_all = orig_killed_all; 237f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 238f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return visit_continue_with_parent; 239f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 240f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 241f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_visitor_status 242f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::visit_leave(ir_assignment *ir) 243f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 244f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (this->in_assignee) 245f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return visit_continue; 246f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 247f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org unsigned kill_mask = ir->write_mask; 248f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (ir->lhs->as_dereference_array()) { 249f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* The LHS of the assignment uses an array indexing operator (e.g. v[i] 250f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * = ...;). Since we only try to constant propagate vectors and 251f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * scalars, this means that either (a) array indexing is being used to 252f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * select a vector component, or (b) the variable in question is neither 253f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * a scalar or a vector, so we don't care about it. In the former case, 254f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * we want to kill the whole vector, since in general we can't predict 255f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * which vector component will be selected by array indexing. In the 256f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * latter case, it doesn't matter what we do, so go ahead and kill the 257f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * whole variable anyway. 258f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 259f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Note that if the array index is constant (e.g. v[2] = ...;), we could 260f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * in principle be smarter, but we don't need to, because a future 261f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * optimization pass will convert it to a simple assignment with the 262f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * correct mask. 263f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 264f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org kill_mask = ~0; 265f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 266f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org kill(ir->lhs->variable_referenced(), kill_mask); 267f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 268f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org add_constant(ir); 269f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 270f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return visit_continue; 271f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 272f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 273f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_visitor_status 274f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::visit_enter(ir_function *ir) 275f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 276f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org (void) ir; 277f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return visit_continue; 278f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 279f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 280f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_visitor_status 281f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::visit_enter(ir_call *ir) 282f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 283f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* Do constant propagation on call parameters, but skip any out params */ 284f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list_iterator sig_param_iter = ir->callee->parameters.iterator(); 285f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org foreach_iter(exec_list_iterator, iter, ir->actual_parameters) { 286f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_variable *sig_param = (ir_variable *)sig_param_iter.get(); 287f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_rvalue *param = (ir_rvalue *)iter.get(); 288f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (sig_param->mode != ir_var_out && sig_param->mode != ir_var_inout) { 289f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_rvalue *new_param = param; 290f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org handle_rvalue(&new_param); 291f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (new_param != param) 292f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org param->replace_with(new_param); 293f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else 294f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org param->accept(this); 295f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 296f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org sig_param_iter.next(); 297f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 298f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 299f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* Since we're unlinked, we don't (necssarily) know the side effects of 300f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * this call. So kill all copies. 301f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 302f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org acp->make_empty(); 303f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->killed_all = true; 304f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 305f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return visit_continue_with_parent; 306f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 307f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 308f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgvoid 309f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::handle_if_block(exec_list *instructions) 310f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 311f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *orig_acp = this->acp; 312f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *orig_kills = this->kills; 313f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org bool orig_killed_all = this->killed_all; 314f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 315f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->acp = new(mem_ctx) exec_list; 316f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->kills = new(mem_ctx) exec_list; 317f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->killed_all = false; 318f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 319f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* Populate the initial acp with a constant of the original */ 320f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org foreach_iter(exec_list_iterator, iter, *orig_acp) { 321f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org acp_entry *a = (acp_entry *)iter.get(); 322f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->acp->push_tail(new(this->mem_ctx) acp_entry(a)); 323f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 324f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 325f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org visit_list_elements(this, instructions); 326f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 327f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (this->killed_all) { 328f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org orig_acp->make_empty(); 329f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 330f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 331f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *new_kills = this->kills; 332f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->kills = orig_kills; 333f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->acp = orig_acp; 334f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->killed_all = this->killed_all || orig_killed_all; 335f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 336f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org foreach_iter(exec_list_iterator, iter, *new_kills) { 337f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org kill_entry *k = (kill_entry *)iter.get(); 338f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org kill(k->var, k->write_mask); 339f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 340f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 341f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 342f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_visitor_status 343f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::visit_enter(ir_if *ir) 344f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 345f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir->condition->accept(this); 346f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org handle_rvalue(&ir->condition); 347f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 348f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org handle_if_block(&ir->then_instructions); 349f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org handle_if_block(&ir->else_instructions); 350f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 351f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* handle_if_block() already descended into the children. */ 352f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return visit_continue_with_parent; 353f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 354f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 355f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_visitor_status 356f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::visit_enter(ir_loop *ir) 357f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 358f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *orig_acp = this->acp; 359f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *orig_kills = this->kills; 360f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org bool orig_killed_all = this->killed_all; 361f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 362f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* FINISHME: For now, the initial acp for loops is totally empty. 363f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * We could go through once, then go through again with the acp 364f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * cloned minus the killed entries after the first run through. 365f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 366f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->acp = new(mem_ctx) exec_list; 367f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->kills = new(mem_ctx) exec_list; 368f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->killed_all = false; 369f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 370f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org visit_list_elements(this, &ir->body_instructions); 371f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 372f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (this->killed_all) { 373f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org orig_acp->make_empty(); 374f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 375f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 376f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org exec_list *new_kills = this->kills; 377f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->kills = orig_kills; 378f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->acp = orig_acp; 379f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->killed_all = this->killed_all || orig_killed_all; 380f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 381f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org foreach_iter(exec_list_iterator, iter, *new_kills) { 382f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org kill_entry *k = (kill_entry *)iter.get(); 383f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org kill(k->var, k->write_mask); 384f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 385f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 386f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* already descended into the children. */ 387f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return visit_continue_with_parent; 388f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 389f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 390f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgvoid 391f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::kill(ir_variable *var, unsigned write_mask) 392f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 393f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org assert(var != NULL); 394f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 395f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* We don't track non-vectors. */ 396f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!var->type->is_vector() && !var->type->is_scalar()) 397f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 398f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 399f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* Remove any entries currently in the ACP for this kill. */ 400f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org foreach_iter(exec_list_iterator, iter, *this->acp) { 401f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org acp_entry *entry = (acp_entry *)iter.get(); 402f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 403f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (entry->var == var) { 404f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org entry->write_mask &= ~write_mask; 405f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (entry->write_mask == 0) 406f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org entry->remove(); 407f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 408f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 409f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 410f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* Add this writemask of the variable to the list of killed 411f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * variables in this block. 412f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 413f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org foreach_iter(exec_list_iterator, iter, *this->kills) { 414f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org kill_entry *entry = (kill_entry *)iter.get(); 415f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 416f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (entry->var == var) { 417f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org entry->write_mask |= write_mask; 418f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 419f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 420f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 421f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* Not already in the list. Make new entry. */ 422f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->kills->push_tail(new(this->mem_ctx) kill_entry(var, write_mask)); 423f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 424f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 425f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/** 426f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Adds an entry to the available constant list if it's a plain assignment 427f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * of a variable to a variable. 428f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 429f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgvoid 430f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgir_constant_propagation_visitor::add_constant(ir_assignment *ir) 431f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 432f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org acp_entry *entry; 433f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 434f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (ir->condition) 435f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 436f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 437f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!ir->write_mask) 438f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 439f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 440f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_dereference_variable *deref = ir->lhs->as_dereference_variable(); 441f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_constant *constant = ir->rhs->as_constant(); 442f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 443f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!deref || !constant) 444f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 445f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 446f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* Only do constant propagation on vectors. Constant matrices, 447f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * arrays, or structures would require more work elsewhere. 448f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 449f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!deref->var->type->is_vector() && !deref->var->type->is_scalar()) 450f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 451f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 452f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org entry = new(this->mem_ctx) acp_entry(deref->var, ir->write_mask, constant); 453f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org this->acp->push_tail(entry); 454f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 455f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 456f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} /* unnamed namespace */ 457f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 458f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/** 459f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Does a constant propagation pass on the code present in the instruction stream. 460f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 461f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgbool 462f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgdo_constant_propagation(exec_list *instructions) 463f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 464f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ir_constant_propagation_visitor v; 465f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 466f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org visit_list_elements(&v, instructions); 467f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 468f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return v.progress; 469f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 470