aco: make program->needs_vcc independent of VCC hints
Totals from 5 (0.00% of 135048) affected shaders: (GFX9) SGPRs: 208 -> 160 (-23.08%) CodeSize: 2700 -> 2692 (-0.30%) Instrs: 533 -> 531 (-0.38%) Latency: 41688 -> 41680 (-0.02%) Reviewed-by: Rhys Perry <pendingchaos02@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15408>
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@ -88,6 +88,21 @@ struct PhiInfo {
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uint16_t linear_phi_defs = 0;
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};
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bool
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instr_needs_vcc(Instruction* instr)
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{
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if (instr->isVOPC())
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return true;
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if (instr->isVOP2() && !instr->isVOP3()) {
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if (instr->operands.size() == 3 && instr->operands[2].isTemp() &&
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instr->operands[2].regClass().type() == RegType::sgpr)
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return true;
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if (instr->definitions.size() == 2)
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return true;
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}
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return false;
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}
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void
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process_live_temps_per_block(Program* program, live& lives, Block* block, unsigned& worklist,
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std::vector<PhiInfo>& phi_info)
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@ -111,6 +126,7 @@ process_live_temps_per_block(Program* program, live& lives, Block* block, unsign
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if (is_phi(insn))
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break;
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program->needs_vcc |= instr_needs_vcc(insn);
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register_demand[idx] = RegisterDemand(new_demand.vgpr, new_demand.sgpr);
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/* KILL */
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@ -118,7 +134,7 @@ process_live_temps_per_block(Program* program, live& lives, Block* block, unsign
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if (!definition.isTemp()) {
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continue;
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}
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if ((definition.isFixed() || definition.hasHint()) && definition.physReg() == vcc)
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if (definition.isFixed() && definition.physReg() == vcc)
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program->needs_vcc = true;
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const Temp temp = definition.getTemp();
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@ -189,7 +205,7 @@ process_live_temps_per_block(Program* program, live& lives, Block* block, unsign
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continue;
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}
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Definition& definition = insn->definitions[0];
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if ((definition.isFixed() || definition.hasHint()) && definition.physReg() == vcc)
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if (definition.isFixed() && definition.physReg() == vcc)
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program->needs_vcc = true;
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const Temp temp = definition.getTemp();
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const size_t n = live.erase(temp.id());
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