Low-level programming language: Difference between revisions

Revision as of 22:49, 23 January 2025

Revision as of 22:50, 23 January 2025

Line 48:

<syntaxhighlight lang="asm">

fib:

mov rax, rdi ; put the argument into %eaxrax

test rdi, rdi ; is it zero?

je .return_from_fib ; yes - return 0, which is already in %eaxrax

cmp rdi, 2 ; is 2 greater than or equal to it?

jbe .return_1_from_fib ; yes (i.e., it's 1 or 2) - return 1

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mov rsi, 1 ; the number before that, which also starts out as 1

.fib_loop:

lea rax, [rsi + rdx] ; put the sum of the previous two numbers into %eaxrax

cmp rcx, 2 ; is the counter 2?

je .return_from_fib ; yes - rax contains the result