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66 lines
1.2 KiB
66 lines
1.2 KiB
; Stores a 16-bit value into the address stored in HL
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; 5 bytes, 24 clocks
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; \1 The value to store (immediate or register)
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MACRO STORE16
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ld [hl], HIGH(\1)
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inc hl
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ld [hl], LOW(\1)
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ENDM
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; Reads a 16-bit value into HL
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; \1 The address to read
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MACRO LOAD16
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ld a, [\1]
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ld l, a
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ld a, [\1 + 1]
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ld h, a
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ENDM
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; Copies bytes to a memory location
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; 7 bytes, 48*N-4 clocks
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; \1 Destination address (16-bit register)
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; \2 Source address (16-bit register)
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; \3 Number of bytes (8-bit register)
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MACRO MEMCPY
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.loop\@:
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ld a, [\2] ; 8
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inc \2 ; 8
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ld [\1], a ; 8
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inc \1 ; 8
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dec \3 ; 4
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jr nz, .loop\@ ; 12/8
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ENDM
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; Adds A to a 16-bit register
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; \1 Destination register
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; 5 * 4 = 20 cycles
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MACRO ADD16
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add LOW(\1)
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ld LOW(\1), a
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adc HIGH(\1)
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sub LOW(\1)
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ld HIGH(\1), a
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ENDM
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; Load between two 16-bit registers
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; \1 Destination register
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; \2 Source register
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MACRO LD16
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ld HIGH(\1), HIGH(\2)
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ld LOW(\1), LOW(\2)
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ENDM
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MACRO SLA16
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sla LOW(\1)
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rl HIGH(\1)
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ENDM
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; Performs SLA on a register N times
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; \1 8-bit register
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; \2 N, a value 1-8
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MACRO slan
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ASSERT 1 <= \2 && \2 <= 8
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REPT \2
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sla \1
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ENDR
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ENDM
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