mirror of https://github.com/sharkdp/bat.git
87 lines
1.2 KiB
NASM
87 lines
1.2 KiB
NASM
global enlight
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section .data
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red dq 0 ; some comment
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green dq 0
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blue dq 0
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data dq 0
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N dd 0
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M dd 0
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change dd 0
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delta db 0
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section .text
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enlight:
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call assign_arguments
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call set_data
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call make_deltas
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ret
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assign_arguments:
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mov qword[red], rdi
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mov qword[green], rsi
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mov qword[blue], rdx
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mov dword[N], ecx
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mov dword[M], r8d
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mov dword[change], r9d
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mov al, byte[rsp + 16]
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mov byte[delta], al
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ret
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set_data:
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mov eax, dword[change]
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cmp eax, 1
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jne not_1
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mov rax, qword[red]
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mov qword[data], rax
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ret
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not_1:
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cmp eax, 2
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jne not_2
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mov rax, qword[green]
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mov qword[data], rax
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ret
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not_2:
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mov rax, qword[blue]
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mov qword[data], rax
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ret
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make_deltas:
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mov ecx, dword[N]
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mov eax, dword[M]
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imul ecx, eax
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loop_start:
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call make_delta
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loop loop_start
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ret
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make_delta:
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mov rax, qword[data]
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add rax, rcx
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dec rax
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mov dl, byte[delta]
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cmp dl, 0
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jl substracting
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adding:
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add dl, byte[rax]
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jc adding_overflow
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mov byte[rax], dl
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ret
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adding_overflow:
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mov byte[rax], 255
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ret
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substracting:
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mov r9b, dl
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mov dl, 0
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sub dl, r9b
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mov r8b, byte[rax]
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sub r8b, dl
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jc substracting_overflow
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mov byte[rax], r8b
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ret
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; another comment
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substracting_overflow:
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mov byte[rax], 0
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ret
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