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Reverse buffer
Learn Reverse buffer in x86-64 Assembly through a focused explanation, a dedicated construct-specific example, an engineering boundary, and a mastery check.
Reverse buffer is an atomic x86-64 Assembly topic inside Loops & Arrays. This lesson focuses on how the Reverse buffer construct is written, what it changes, and when it is the right tool.
Trace the example line by line. Identify the exact syntax for Reverse buffer, the input state before it runs, and the resulting value, control flow, database state, hardware behavior, or runtime effect afterward. Neighboring lessons use different constructs rather than renamed copies of this one.
Topic-specific example
lea rsi,[rel buf]
lea rdi,[rel buf+4]
.loop:
cmp rsi,rdi
jae .done
mov al,[rsi]
xchg al,[rdi]
mov [rsi],al
inc rsi
dec rdi
jmp .loop
.done:
section .data
buf db 'abcde'For Reverse buffer, test the boundary that belongs to this exact feature rather than a generic failure case. Check invalid or empty input, NULL/unknown state, numeric limits, transaction or exception behavior, synthesis/runtime constraints, ownership/permission rules, or backtracking/control-flow effects where they apply.