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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.43 DIV4S (Correction Answer for Signed Division)
This instruction is used in signed division. It should be used in combinations such as
DIV0S, DIV1 x 32, DIV2, DIV3 and DIV4S.
■ DIV4S (Correction Answer for Signed Division)
Assembler format: DIV4S
Operation: if (D1 = = 1) {
0 – MDL → MDL
}
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: 1 cycle
Instruction format:
Example: DIV4S
NZVC
––––
MSB LSB
1001111101110000
MDH
MDL
D1 D0 T
SCR SCR
D1 D0 T
110110
R2
00FF FFFF
MDH
MDL
R2
FFFF FFF1
0000 0000
0000 000F
0000 0000
00FF FFFF
NZVC
CCR CCR
NZVC
00000000
Before execution After execution
Instruction bit pattern : 1001 1111 0111 0000