255 lines
8.1 KiB
C
255 lines
8.1 KiB
C
/*
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* Copyright (C) 2021 Valve Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "ir3.h"
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/* Lower several macro-instructions needed for shader subgroup support that
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* must be turned into if statements. We do this after RA and post-RA
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* scheduling to give the scheduler a chance to rearrange them, because RA
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* may need to insert OPC_META_READ_FIRST to handle splitting live ranges, and
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* also because some (e.g. BALLOT and READ_FIRST) must produce a shared
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* register that cannot be spilled to a normal register until after the if,
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* which makes implementing spilling more complicated if they are already
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* lowered.
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*/
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static void
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replace_pred(struct ir3_block *block, struct ir3_block *old_pred,
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struct ir3_block *new_pred)
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{
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for (unsigned i = 0; i < block->predecessors_count; i++) {
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if (block->predecessors[i] == old_pred) {
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block->predecessors[i] = new_pred;
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return;
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}
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}
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}
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static void
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replace_physical_pred(struct ir3_block *block, struct ir3_block *old_pred,
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struct ir3_block *new_pred)
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{
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for (unsigned i = 0; i < block->physical_predecessors_count; i++) {
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if (block->physical_predecessors[i] == old_pred) {
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block->physical_predecessors[i] = new_pred;
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return;
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}
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}
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}
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static void
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mov_immed(struct ir3_register *dst, struct ir3_block *block, unsigned immed)
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{
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struct ir3_instruction *mov = ir3_instr_create(block, OPC_MOV, 1, 1);
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struct ir3_register *mov_dst = ir3_dst_create(mov, dst->num, dst->flags);
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mov_dst->wrmask = dst->wrmask;
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struct ir3_register *src =
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ir3_src_create(mov, INVALID_REG, (dst->flags & IR3_REG_HALF) | IR3_REG_IMMED);
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src->uim_val = immed;
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mov->cat1.dst_type = (dst->flags & IR3_REG_HALF) ? TYPE_U16 : TYPE_U32;
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mov->cat1.src_type = mov->cat1.dst_type;
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mov->repeat = util_last_bit(mov_dst->wrmask) - 1;
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}
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static struct ir3_block *
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split_block(struct ir3 *ir, struct ir3_block *before_block,
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struct ir3_instruction *instr, struct ir3_block **then)
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{
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struct ir3_block *then_block = ir3_block_create(ir);
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struct ir3_block *after_block = ir3_block_create(ir);
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list_add(&then_block->node, &before_block->node);
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list_add(&after_block->node, &then_block->node);
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for (unsigned i = 0; i < ARRAY_SIZE(before_block->successors); i++) {
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after_block->successors[i] = before_block->successors[i];
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if (after_block->successors[i])
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replace_pred(after_block->successors[i], before_block, after_block);
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}
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for (unsigned i = 0; i < ARRAY_SIZE(before_block->physical_successors); i++) {
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after_block->physical_successors[i] = before_block->physical_successors[i];
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if (after_block->physical_successors[i]) {
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replace_physical_pred(after_block->physical_successors[i],
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before_block, after_block);
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}
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}
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before_block->successors[0] = then_block;
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before_block->successors[1] = after_block;
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before_block->physical_successors[0] = then_block;
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before_block->physical_successors[1] = after_block;
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ir3_block_add_predecessor(then_block, before_block);
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ir3_block_add_predecessor(after_block, before_block);
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ir3_block_add_physical_predecessor(then_block, before_block);
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ir3_block_add_physical_predecessor(after_block, before_block);
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then_block->successors[0] = after_block;
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then_block->physical_successors[0] = after_block;
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ir3_block_add_predecessor(after_block, then_block);
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ir3_block_add_physical_predecessor(after_block, then_block);
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foreach_instr_from_safe (rem_instr, &instr->node, &before_block->instr_list) {
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list_del(&rem_instr->node);
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list_addtail(&rem_instr->node, &after_block->instr_list);
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rem_instr->block = after_block;
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}
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after_block->brtype = before_block->brtype;
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after_block->condition = before_block->condition;
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*then = then_block;
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return after_block;
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}
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static bool
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lower_block(struct ir3 *ir, struct ir3_block **block)
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{
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bool progress = false;
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foreach_instr_safe (instr, &(*block)->instr_list) {
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switch (instr->opc) {
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case OPC_BALLOT_MACRO:
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case OPC_ANY_MACRO:
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case OPC_ALL_MACRO:
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case OPC_ELECT_MACRO:
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case OPC_READ_COND_MACRO:
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case OPC_READ_FIRST_MACRO:
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case OPC_SWZ_SHARED_MACRO:
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break;
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default:
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continue;
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}
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struct ir3_block *before_block = *block;
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struct ir3_block *then_block;
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struct ir3_block *after_block =
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split_block(ir, before_block, instr, &then_block);
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/* For ballot, the destination must be initialized to 0 before we do
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* the movmsk because the condition may be 0 and then the movmsk will
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* be skipped. Because it's a shared register we have to wrap the
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* initialization in a getone block.
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*/
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if (instr->opc == OPC_BALLOT_MACRO) {
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before_block->brtype = IR3_BRANCH_GETONE;
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before_block->condition = NULL;
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mov_immed(instr->dsts[0], then_block, 0);
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before_block = after_block;
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after_block = split_block(ir, before_block, instr, &then_block);
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}
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switch (instr->opc) {
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case OPC_BALLOT_MACRO:
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case OPC_READ_COND_MACRO:
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case OPC_ANY_MACRO:
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case OPC_ALL_MACRO:
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before_block->condition = instr->srcs[0]->def->instr;
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break;
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default:
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before_block->condition = NULL;
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break;
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}
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switch (instr->opc) {
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case OPC_BALLOT_MACRO:
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case OPC_READ_COND_MACRO:
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before_block->brtype = IR3_BRANCH_COND;
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break;
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case OPC_ANY_MACRO:
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before_block->brtype = IR3_BRANCH_ANY;
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break;
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case OPC_ALL_MACRO:
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before_block->brtype = IR3_BRANCH_ALL;
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break;
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case OPC_ELECT_MACRO:
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case OPC_READ_FIRST_MACRO:
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case OPC_SWZ_SHARED_MACRO:
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before_block->brtype = IR3_BRANCH_GETONE;
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break;
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default:
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unreachable("bad opcode");
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}
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switch (instr->opc) {
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case OPC_ALL_MACRO:
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case OPC_ANY_MACRO:
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case OPC_ELECT_MACRO:
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mov_immed(instr->dsts[0], then_block, 1);
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mov_immed(instr->dsts[0], before_block, 0);
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break;
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case OPC_BALLOT_MACRO: {
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unsigned comp_count = util_last_bit(instr->dsts[0]->wrmask);
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struct ir3_instruction *movmsk = ir3_instr_create(then_block, OPC_MOVMSK, 1, 0);
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ir3_dst_create(movmsk, instr->dsts[0]->num, instr->dsts[0]->flags);
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movmsk->repeat = comp_count - 1;
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break;
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}
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case OPC_READ_COND_MACRO:
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case OPC_READ_FIRST_MACRO: {
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struct ir3_instruction *mov = ir3_instr_create(then_block, OPC_MOV, 1, 1);
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unsigned src = instr->opc == OPC_READ_COND_MACRO ? 1 : 0;
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ir3_dst_create(mov, instr->dsts[0]->num, instr->dsts[0]->flags);
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struct ir3_register *new_src = ir3_src_create(mov, 0, 0);
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*new_src = *instr->srcs[src];
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mov->cat1.dst_type = mov->cat1.src_type = TYPE_U32;
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break;
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}
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case OPC_SWZ_SHARED_MACRO: {
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struct ir3_instruction *swz =
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ir3_instr_create(then_block, OPC_SWZ, 2, 2);
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ir3_dst_create(swz, instr->dsts[0]->num, instr->dsts[0]->flags);
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ir3_dst_create(swz, instr->dsts[1]->num, instr->dsts[1]->flags);
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ir3_src_create(swz, instr->srcs[0]->num, instr->srcs[0]->flags);
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ir3_src_create(swz, instr->srcs[1]->num, instr->srcs[1]->flags);
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swz->cat1.dst_type = swz->cat1.src_type = TYPE_U32;
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swz->repeat = 1;
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break;
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}
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default:
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unreachable("bad opcode");
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}
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*block = after_block;
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list_delinit(&instr->node);
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progress = true;
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}
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return progress;
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}
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bool
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ir3_lower_subgroups(struct ir3 *ir)
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{
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bool progress = false;
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foreach_block (block, &ir->block_list)
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progress |= lower_block(ir, &block);
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return progress;
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}
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