Renesas M32R-FPU Manual Do Utilizador

3

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M32R-FPU Software Manual (Rev.1.01)

DSP  function instruction

Multiply

accumulator = ( ( signed )  Rsrc1 * ( signed short ) ( Rsrc2 >> 16 ) );

MULWHI multiplies the 32 bits of Rsrc1 and the high-order 16 bits of Rsrc2, and stores the

result in the accumulator.

The LSB of the multiplication result is aligned with the LSB of the accumulator, and the portion

corresponding to bits 0 through 15 of the accumulator is sign-extended.  The 32 bits of Rsrc1 and

high-order 16 bits of Rsrc2 are treated as signed values.

The condition bit (C) is unchanged.

None

Rsrc1

32 bits

Rsrc2

x

0

15 16

31

0

15 16

31 32

47 48

63

high-order 16 bits

Value in accumulator after the
execution of the MULWHI instruction

Sign extension

INSTRUCTIONS

3.2 Instruction description