Encoding:

EXTEND

11110

LSB

(pos)

1

MSB

(pos+size-1)

SHIFT

00110

rx

ry

sel = 1

SLL

00

5

5

1

5

5

3

3

3

2

Format: 

INS ry, rx, pos, size

MIPS16e2

Insert Bit Field Extended

Purpose:

Insert Bit Field Extended

To merge a right-justified bit field from GPR rx info a specified field in GPR ry

Description:

GPR[ry] = InsertField(GPR[ry], GPR[rx], msbd, lsb)

TThe right-most size bits from GPR rx are merged into the value GPR ry starting at bit position pos. The result is placed back in GPR ry.

Restrictions:

In implementations prior to MIPS16e2, this instriction yields unpredicable result. It would typically be executed as an SLL instruction. The operation is UNPREDICTABLE if lsb > msb.

Operation: 

if lsb > msb)then
   UNPREDICTABLE
endif
GPR[XLat[ry]] = GPR[XLat[ry]]31..msb+1 || GPR[XLat[rx]]msb-lsb..0 || GPR[XLat[ry]]lsb-1..0

Exceptions:

None 

GPR[XLat[ry]] = GPR[XLat[ry]]31..msb+1 || GPR[XLat[ry]]msb-lsb..0 || GPR[XLat[ry]]lsb-1..0

Exceptions:

None