How to read and write x86 flags registers directly?

Question

From what I\'ve read, seems like there are 9 different flags. Is it possible to read/change them directly? I know I can know for example if the zero flag is set after doing

Answer 1

SETcc

This instruction family is another way to observe some flags / combination of flags.

It sets the value of a byte based on the individual FLAGS.

E.g., for CF:

stc
setc al
; al == 1

clc
setc al
; al == 0

Runnable GitHub upstream with assertions.

Jcc

This instruction family is of course another possibility for certain flags, and could be used to implement SETcc:

jc set
mov al, 0
jmp end
set:
mov al, 1
end:

Runnable GitHub upstream with assertions.