Operations:

Format

Syntax:

Operation:

Operands:

Architecture revision

Opcode

1

mulsatrndhh.h Rd, Rx:<part>, Ry:<part> 

If (Rx-part == t) then operand1 = SE(Rx[31:16]) else operand1 = SE(Rx[15:0]);
If (Ry-part == t) then operand2 = SE(Ry[31:16]) else operand2 = SE(Ry[15:0]);
If (operand1 == operand2 == 0x8000)
      Rd = 0x7FFF;
else
      Rd = SE( ((operand1 × operand2) + 0x4000 ) >> 15 );
 
{d, x, y} ∈ {0, 1, …, 15}
part ∈ {t,b}

Rev1+

111

Rx

00000

Ry

0000101010

X

Y

Rd

3

4

5

4

10

1

1

4

Description

Multiplies the two halfword registers specified, shifts the results one position to the left and stores the result in the destination word-register. If the two operands equal -1, the result is satu- rated to the largest positive 16-bit fractional number. The halfword registers are selected as either the high or low part of the operand registers. The product is rounded.

Status Flags:

Q:

Set if saturation occurred, or previously set.

V:

Not affected.

N:

Not affected.

Z:

Not affected.

C:

Not affected.

Example: 

mulsatrndhh.h R10, R2:t, R3:b
will perform R10 = SE( Sat( SE(R2[31:16])  × SE(R3[15:0]) ) + 0x4000) >> 15)