test: x86-64 Assembly NASM syntax test

tests/syntax-tests/source/Assembly (x86_64)/test.nasm

@@ -0,0 +1,86 @@
+global enlight
+
+section .data
+  red dq 0 ; some comment
+  green dq 0
+  blue dq 0
+  data dq 0
+  N dd 0
+  M dd 0
+  change dd 0
+  delta db 0
+
+section .text
+enlight:
+  call assign_arguments
+  call set_data
+  call make_deltas
+  ret
+
+assign_arguments:
+  mov qword[red], rdi
+  mov qword[green], rsi
+  mov qword[blue], rdx
+  mov dword[N], ecx
+  mov dword[M], r8d
+  mov dword[change], r9d
+  mov al, byte[rsp + 16]
+  mov byte[delta], al
+  ret
+
+set_data:
+  mov eax, dword[change]
+  cmp eax, 1
+  jne not_1
+  mov rax, qword[red]
+  mov qword[data], rax
+  ret
+not_1:
+  cmp eax, 2
+  jne not_2
+  mov rax, qword[green]
+  mov qword[data], rax
+  ret
+not_2:
+  mov rax, qword[blue]
+  mov qword[data], rax
+  ret
+
+
+make_deltas:
+  mov ecx, dword[N]
+  mov eax, dword[M]
+  imul ecx, eax
+loop_start:
+  call make_delta
+  loop loop_start
+  ret
+
+make_delta:
+  mov rax, qword[data]
+  add rax, rcx
+  dec rax
+  mov dl, byte[delta]
+  cmp dl, 0
+  jl substracting
+adding:
+  add dl, byte[rax]
+  jc adding_overflow
+  mov byte[rax], dl
+  ret
+adding_overflow:
+  mov byte[rax], 255 
+  ret
+substracting:
+  mov r9b, dl
+  mov dl, 0
+  sub dl, r9b
+  mov r8b, byte[rax]
+  sub r8b, dl
+  jc substracting_overflow
+  mov byte[rax], r8b
+  ret
+; another comment
+substracting_overflow:
+  mov byte[rax], 0
+  ret