38 struct Idx {  struct
39    bool operator==(const Idx& other) const { return block == other.block && instr == other.instr; }  in operator ==()  argument
40    bool operator!=(const Idx& other) const { return !operator==(other); }  in operator !=()  argument
48 Idx not_written_in_block{UINT32_MAX, 0};
49 Idx clobbered{UINT32_MAX, 1};
50 Idx const_or_undef{UINT32_MAX, 2};
51 Idx written_by_multiple_instrs{UINT32_MAX, 3};
58    std::vector<std::array<Idx, max_reg_cnt>> instr_idx_by_regs;
84    Instruction* get(Idx idx) { return program->blocks[idx.block].instructions[idx.instr].get(); }  in get()
96       Idx idx{ctx.current_block->index, ctx.current_instr_idx};  in save_reg_writes()
108 Idx
113    Idx instr_idx = ctx.instr_idx_by_regs[ctx.current_block->index][physReg.reg()];  in last_writer_idx()
119                   [instr_idx](Idx i) { return i == instr_idx; });  in last_writer_idx()
124 Idx
131    Idx instr_idx = ctx.instr_idx_by_regs[ctx.current_block->index][op.physReg().reg()];  in last_writer_idx()
143 is_clobbered_since(pr_opt_ctx& ctx, PhysReg reg, RegClass rc, const Idx& idx)  in is_clobbered_since()
158       Idx& i = ctx.instr_idx_by_regs[current_block_idx][r];  in is_clobbered_since()
175 is_clobbered_since(pr_opt_ctx& ctx, const T& t, const Idx& idx)  in is_clobbered_since()
204    Idx op0_instr_idx = last_writer_idx(ctx, instr->operands[0]);  in try_apply_branch_vcc()
205    Idx last_vcc_wr_idx = last_writer_idx(ctx, vcc, ctx.program->lane_mask);  in try_apply_branch_vcc()
271       Idx wr_idx = last_writer_idx(ctx, instr->operands[0]);  in try_optimize_scc_nocompare()
272       Idx sccwr_idx = last_writer_idx(ctx, scc, s1);  in try_optimize_scc_nocompare()
338       Idx wr_idx = last_writer_idx(ctx, instr->operands[scc_op_idx]);  in try_optimize_scc_nocompare()
393       Idx op_instr_idx = last_writer_idx(ctx, instr->operands[i]);  in try_combine_dpp()