Claude 1ede169f1e Implement IR-based code generator (--use-ir) ... New src/codegen/ir_codegen.rs walks IrProgram and emits 6502 instructions. This enables optimizer passes to actually affect the output ROM. Design: - Each IR temp gets a zero-page slot at $80 + temp_index - Functions reset the temp counter at entry (temps don't outlive functions) - Globals map by name to their analyzer-assigned zero-page addresses - Operands are loaded into A, computed, stored back to the dest slot Handles all IrOp variants: - LoadImm, LoadVar, StoreVar (basic loads/stores) - Add/Sub (CLC+ADC / SEC+SBC) - Mul (JSR __multiply runtime routine) - And/Or/Xor (zero-page operands) - ShiftLeft/ShiftRight (repeated ASL/LSR) - Negate/Complement (EOR #$FF + optional two's complement) - CmpEq/Ne/Lt/Gt/LtEq/GtEq (CMP + conditional branch + 0/1) - ArrayLoad/ArrayStore (TAX + ZeroPageX/AbsoluteX) - Call (ZP param passing + JSR) - DrawSprite (OAM slot 0 write, uses sprite_tiles map) - ReadInput (LDA $01, P1 input) - WaitFrame (poll frame flag at $00) All terminators: - Jump (JMP to block label) - Branch (LDA temp + BNE true / JMP false) - Return (optional value in A + RTS) - Unreachable (BRK) IR lowering fixes: - ReadInput now has a destination IrTemp (was a side-effect-only op) - ButtonRead uses the proper input temp instead of uninitialized register - Logical AND/OR use new emit_move helper (OR with zero) instead of bogus raw VarId for path merging CLI: - New --use-ir flag on `build` subcommand to opt in to IR codegen - Default remains AST codegen (for now); IR codegen is experimental All 7 examples compile through the IR pipeline and produce valid iNES ROMs. Tests: 266 total (7 new ir_codegen unit + 2 new integration). https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3		2026-04-12 10:23:43 +00:00
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integration	Implement NEScript compiler Milestone 1 ("Hello Sprite")	2026-04-11 22:07:56 +00:00
integration_test.rs	Implement IR-based code generator (--use-ir)	2026-04-12 10:23:43 +00:00