GMS30C2116 Datasheet, PDF (209/322 Pages) Hynix Semiconductor – USERS MANUAL

Appendix A. Instruction Set Details
Divide with Non-Negative Signed
A-35
DIVS
Format:
RR format
15
OP-code
0000 11
10 9
d
87
s
Rd-code
43
0
Rs-code
s = 0: Rs-code encoded G0..G15 for Rs
s = 1: Rs-code encoded L0..L15 for Rs
d = 0: Rd-code encoded G0..G15 for Rd
d = 1: Rd-code encoded L0..L15 for Rd
Notation:
DIVS Rd, Rs
Description:
The double-word destination operand (dividend) is divided by the single-word source
operand (divisor), the quotient is placed in the low-order destination register (Rdf), the
remainder is placed in the high-order destination register (Rd) and the condition flags are
set or cleared according to the quotient.
A trap to Range Error occurs if the divisor is zero or the value of the quotient exceeds the
integer value range (quotient overflow). The result (in Rd//Rdf) is then undefined. A trap to
Range Error also occurs and the result is undefined if the dividend is negative.
The dividend is a non-negative signed double-word integer, the devisor, the quotient and
the remainder are signed integers; a non-zero remainder has the sign of the dividend.
The result is undefined if Rs denotes the same register as Rd or Rdf or if the PC or the SR
is denoted.
Operation:
If Rs = 0 or quotient overflow or Rd(31) = 1 then
Rd//Rdf := undefined;
Z := undefined;, N := undefined;,
V :=1 trap -> Range Error
else
remainder Rd, quotient Rdf := (Rd//Rdf) / Rs;
Z := Rdf = 0
N := Rd(31), V:= 0;
Exceptions:
Quotient Overflow (Trap to a Range Error)
Division by Zero (Trap to a Range Error)
Dividend is Negative (Trap to a Range Error)