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Add COMPILE-IR method for IR-MINUS

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John Lorentzson 2025-07-03 20:12:59 +02:00
parent f814f9fbb9
commit 76cd607bab
1 changed files with 12 additions and 0 deletions
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12
wip-duuqnd/user-side-compiler/backend/code-generator.lisp
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@ -92,6 +92,7 @@
(define-normal-emitter emit-lda #xa9 #xa5 #xad)
(define-normal-emitter emit-sta (error "STA has no immediate mode.") #x85 #x8d)
(define-normal-emitter emit-adc #x69 #x65 #x6d)
(define-normal-emitter emit-sbc #xe9 #xe5 #xed)
(define-normal-emitter emit-cmp #xc9 #xc5 #xcd)
(defun emit-store-data (data)
@ -163,6 +164,17 @@
(emit-adc :address (data-reference (second (inputs inst)))))
(emit-store-data (output inst)))
(defmethod compile-ir ((inst ir-minus))
(unless (= (length (inputs inst)) 2)
(error "During the final code generation step, IR-MINUS must have exactly 2 operands."))
(emit-load-data (first (inputs inst)))
(emit-asm-instruction :opcode #x38 :byte-length 1) ; Set Carry
(if (eql (strategy (allocation-details (second (inputs inst))))
:constant)
(emit-sbc :immediate (ir-constant-value (second (inputs inst))))
(emit-sbc :address (data-reference (second (inputs inst)))))
(emit-store-data (output inst)))
(defmethod compile-ir ((inst ir-assign))
(emit-load-data (input inst))
(emit-store-data (output inst)))