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aco/live_var_analysis: Handle calls

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34531>
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Natalie Vock 2025-02-17 18:42:49 +01:00 • committed by Marge Bot
parent 9c8a17e172
commit 2be37a91fa
1 changed files with 41 additions and 1 deletions
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42
src/amd/compiler/aco_live_var_analysis.cpp
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@ -186,7 +186,8 @@ process_live_temps_per_block(live_ctx& ctx, Block* block)
break;
ctx.program->needs_vcc |= instr_needs_vcc(insn);
insn->register_demand = RegisterDemand(new_demand.vgpr, new_demand.sgpr);
RegisterDemand demand_after_instr = RegisterDemand(new_demand.vgpr, new_demand.sgpr);
insn->register_demand = demand_after_instr;
bool has_vgpr_def = false;
@ -371,6 +372,45 @@ process_live_temps_per_block(live_ctx& ctx, Block* block)
}
}
if (insn->isCall()) {
/* For call instructions, definitions are live at the time s_setpc finishes,
* which continues execution in the callee. This means that all definitions are
* live concurrently with operands.
*/
operand_demand += insn->definitions[0].getTemp();
if (insn->definitions[1].physReg() == vcc)
operand_demand += insn->definitions[1].getTemp();
RegisterDemand limit = get_addr_regs_from_waves(ctx.program, ctx.program->min_waves);
insn->call().callee_preserved_limit = RegisterDemand();
BITSET_DECLARE(preserved_regs, 512);
insn->call().abi.preservedRegisters(preserved_regs, limit);
for (auto& op : insn->operands) {
if (!op.isTemp() || !op.isPrecolored() || op.isClobbered())
continue;
if (op.isKill())
insn->call().callee_preserved_limit -= op.getTemp();
for (unsigned i = 0; i < op.size(); ++i)
BITSET_SET(preserved_regs, op.physReg().reg() + i);
}
RegisterDemand preserved_reg_demand;
preserved_reg_demand.sgpr =
__bitset_prefix_sum(preserved_regs, limit.sgpr, 256 / BITSET_WORDBITS);
preserved_reg_demand.vgpr = __bitset_prefix_sum(preserved_regs + 256 / BITSET_WORDBITS,
limit.vgpr, 256 / BITSET_WORDBITS);
insn->call().callee_preserved_limit += preserved_reg_demand;
insn->call().caller_preserved_demand = demand_after_instr;
for (unsigned i = 0; i < insn->definitions.size(); ++i) {
if (!insn->definitions[i].isKill())
insn->call().caller_preserved_demand -= insn->definitions[i].getTemp();
}
}
operand_demand += new_demand;
insn->register_demand.update(operand_demand);
block->register_demand.update(insn->register_demand);