Renesas M32R-FPU Manual Do Utilizador

3

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M32R-FPU Software Manual (Rev.1.01)

DSP function instruction

Saturation Process

{ signed64bit tmp;

tmp = ( signed64bit ) accumulator << 1;

tmp = tmp + 0x0000 0000 8000 0000;

if( 0x0000 7fff 0000 0000 < tmp )

    accumulator = 0x0000 7fff 0000 0000;

else if( tmp < 0xffff 8000 0000 0000 )

    accumulator = 0xffff 8000 0000 0000;

else

    accumulator = tmp & 0xffff ffff 0000 0000; }

RACH rounds the contents in the accumulator to halfword size and stores the result in the

accumulator.

The condition bit (C) is unchanged.

None

INSTRUCTIONS

3.2 Instruction description