aco/ra: don't immediately assign a register for p_branch
These get now assigned after handling phis. Totals from 564 (0.42% of 134913) affected shaders: (GFX10.3) CodeSize: 5519744 -> 5515308 (-0.08%) Instrs: 1063045 -> 1061936 (-0.10%) Latency: 11880452 -> 11875904 (-0.04%) InvThroughput: 2259933 -> 2259581 (-0.02%); split: -0.02%, +0.00% Copies: 86908 -> 85799 (-1.28%) Reviewed-by: Rhys Perry <pendingchaos02@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13432>
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@ -2577,6 +2577,13 @@ register_allocation(Program* program, std::vector<IDSet>& live_out_per_block, ra
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continue;
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}
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/* unconditional branches are handled after phis of the target */
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if (instr->opcode == aco_opcode::p_branch) {
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/* last instruction of the block */
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instructions.emplace_back(std::move(instr));
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break;
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}
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std::vector<std::pair<Operand, Definition>> parallelcopy;
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assert(!is_phi(instr));
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