/* * Copyright © 2018 Valve Corporation * Copyright © 2018 Google * * 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. * */ #include "aco_ir.h" #include "aco_builder.h" /* * Insert p_linear_start instructions right before RA to correctly allocate * temporaries for reductions that have to disrespect EXEC by executing in * WWM. */ namespace aco { void setup_reduce_temp(Program* program) { unsigned last_top_level_block_idx = 0; unsigned maxSize = 0; std::vector hasReductions(program->blocks.size()); for (Block& block : program->blocks) { for (aco_ptr& instr : block.instructions) { if (instr->format != Format::PSEUDO_REDUCTION) continue; maxSize = MAX2(maxSize, instr->operands[0].size()); hasReductions[block.index] = true; } } if (maxSize == 0) return; assert(maxSize == 1 || maxSize == 2); Temp reduceTmp(0, RegClass(RegType::vgpr, maxSize).as_linear()); Temp vtmp(0, RegClass(RegType::vgpr, maxSize).as_linear()); int inserted_at = -1; int vtmp_inserted_at = -1; bool reduceTmp_in_loop = false; bool vtmp_in_loop = false; for (Block& block : program->blocks) { /* insert p_end_linear_vgpr after the outermost loop */ if (reduceTmp_in_loop && block.loop_nest_depth == 0) { assert(inserted_at == (int)last_top_level_block_idx); aco_ptr end{create_instruction(aco_opcode::p_end_linear_vgpr, Format::PSEUDO, vtmp_in_loop ? 2 : 1, 0)}; end->operands[0] = Operand(reduceTmp); if (vtmp_in_loop) end->operands[1] = Operand(vtmp); /* insert after the phis of the loop exit block */ std::vector>::iterator it = block.instructions.begin(); while ((*it)->opcode == aco_opcode::p_linear_phi || (*it)->opcode == aco_opcode::p_phi) ++it; block.instructions.insert(it, std::move(end)); reduceTmp_in_loop = false; } if (block.kind & block_kind_top_level) last_top_level_block_idx = block.index; if (!hasReductions[block.index]) continue; std::vector>::iterator it; for (it = block.instructions.begin(); it != block.instructions.end(); ++it) { Instruction *instr = (*it).get(); if (instr->format != Format::PSEUDO_REDUCTION) continue; ReduceOp op = static_cast(instr)->reduce_op; reduceTmp_in_loop |= block.loop_nest_depth > 0; if ((int)last_top_level_block_idx != inserted_at) { reduceTmp = {program->allocateId(), reduceTmp.regClass()}; aco_ptr create{create_instruction(aco_opcode::p_start_linear_vgpr, Format::PSEUDO, 0, 1)}; create->definitions[0] = Definition(reduceTmp); /* find the right place to insert this definition */ if (last_top_level_block_idx == block.index) { /* insert right before the current instruction */ it = block.instructions.insert(it, std::move(create)); it++; /* inserted_at is intentionally not updated here, so later blocks * would insert at the end instead of using this one. */ } else { assert(last_top_level_block_idx < block.index); /* insert before the branch at last top level block */ std::vector>& instructions = program->blocks[last_top_level_block_idx].instructions; instructions.insert(std::next(instructions.begin(), instructions.size() - 1), std::move(create)); inserted_at = last_top_level_block_idx; } } /* same as before, except for the vector temporary instead of the reduce temporary */ unsigned cluster_size = static_cast(instr)->cluster_size; bool need_vtmp = op == imul32 || op == fadd64 || op == fmul64 || op == fmin64 || op == fmax64; if (program->chip_class >= GFX10 && cluster_size == 64 && op != gfx10_wave64_bpermute) need_vtmp = true; need_vtmp |= cluster_size == 32; vtmp_in_loop |= need_vtmp && block.loop_nest_depth > 0; if (need_vtmp && (int)last_top_level_block_idx != vtmp_inserted_at) { vtmp = {program->allocateId(), vtmp.regClass()}; aco_ptr create{create_instruction(aco_opcode::p_start_linear_vgpr, Format::PSEUDO, 0, 1)}; create->definitions[0] = Definition(vtmp); if (last_top_level_block_idx == block.index) { it = block.instructions.insert(it, std::move(create)); it++; } else { assert(last_top_level_block_idx < block.index); std::vector>& instructions = program->blocks[last_top_level_block_idx].instructions; instructions.insert(std::next(instructions.begin(), instructions.size() - 1), std::move(create)); vtmp_inserted_at = last_top_level_block_idx; } } instr->operands[1] = Operand(reduceTmp); if (need_vtmp) instr->operands[2] = Operand(vtmp); /* scalar temporary */ Builder bld(program); instr->definitions[1] = bld.def(s2); /* scalar identity temporary */ bool need_sitmp = program->chip_class >= GFX10 && cluster_size == 64; if (instr->opcode == aco_opcode::p_exclusive_scan) { need_sitmp |= (op == imin32 || op == imin64 || op == imax32 || op == imax64 || op == fmin32 || op == fmin64 || op == fmax32 || op == fmax64 || op == fmul64); } if (need_sitmp) { instr->definitions[2] = bld.def(RegClass(RegType::sgpr, instr->operands[0].size())); } /* vcc clobber */ if (op == iadd32 && program->chip_class < GFX9) instr->definitions[4] = Definition(vcc, s2); } } } };