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LD pd,ps+IX     Load     Rabbit 4000 Instruction
Opcode
Instruction
Clocks
Operation
-- LD pd,ps+IX
4 (2,2)
 pd = ps + IX

6D 04

LD PW,PW+IX

4 (2,2)

PW = PW + IX

6D 14

LD PW,PX+IX

PW = PX + IX

6D 24

LD PW,PY+IX

PW = PY + IX

6D 34

LD PW,PZ+IX

PW = PZ + IX

6D 44

LD PX,PW+IX

4 (2,2)

PX = PW + IX

6D 54

LD PX,PX+IX

PX = PX + IX

6D 64

LD PX,PY+IX

PX = PY + IX

6D 74

LD PX,PZ+IX

PX = PZ + IX

6D 84

LD PY,PW+IX

4 (2,2)

PY = PW + IX

6D 94

LD PY,PX+IX

PY = PX + IX

6D A4

LD PY,PY+IX

PY = PY + IX

6D B4

LD PY,PZ+IX

PY = PZ + IX

6D C4

LD PZ,PW+IX

4 (2,2)

PZ = PW + IX

6D D4

LD PZ,PX+IX

PZ = PX + IX

6D E4

LD PZ,PY+IX

PZ = PY + IX

6D F4

LD PZ,PZ+IX

PZ = PZ + IX


Flags ALTD IOI/IOE
S
Z
L/V
C
F
R
SP
S
D
-
-
-
-
·

Description

Loads pd (any of the 32-bit registers PW, PX, PY or PZ) with the sum of ps (any of PW, PX, PY or PZ) and IX. These instructions cannot be used for general 32-bit arithmetic because the addition depends on the upper two bytes of ps. If the upper two bytes are all ones, then it is 16-bit addition. The following example illustrates this point: 


ld PW,0xFFFFFFFF
ld PW,PW+IX            ;yields PW=0xFFFF0000 if IX=1


ld PW,0x7FFFFFFF
ld PW,PW+IX            ;yields PW=0x80000000 if IX=1
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