Compare Instructions Flashcards
1
Q
< operation >
CMP – compare
A
Flags set to result of (Rn − Operand2).
2
Q
< operation >
CMN – compare negative
A
Flags set to result of (Rn + Operand2).
3
Q
< operation >
TST – bitwise test
A
Flags set to result of (Rn AND Operand2).
4
Q
< operation >
TEQ – test equivalence
A
Flags set to result of (Rn EOR Operand2).
5
Q
Comparisons produce no results –
A
- they just set condition codes. Ordinary instructions will also set condition codes if the “S” bit is set. The “S” bit is implied for comparison instructions.
6
Q
CMP r0, #42
A
Compare R0 to 42.
7
Q
CMN r2, #42
A
Compare R2 to -42.
8
Q
TST r11, #1
A
Test bit zero.
9
Q
TEQ r8, r9
A
Test R8 equals R9.
10
Q
SUBS r1, r0, #42
A
Compare R0 to 42, with result
11
Q
CMP is like
A
CMP is like SUB.
12
Q
CMN is like
A
ADD – subtract of a negative number is the same as add.
13
Q
TST is like
A
TST is like AND.
14
Q
TEQ is like
A
TEQ is like EOR – exclusive or of identical numbers gives result of zero.
