Renesas M32R-FPU Manuel d'utilisateur télécharger pdf (Page 131)

3-93 M32R-FPU Software Manual (Rev.1.01)

RACHRACH

DSP function instruction

Round accumulator halfword

[Mnemonic]

RACH

[Function]

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; }

[Description]

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

accumulator.

The condition bit (C) is unchanged.

[EIT occurrence]

None

[Encoding]

RACH00000101 00001000

INSTRUCTIONS

3.2 Instruction description

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 193 194

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Renesas M32R-FPU Manuel d'utilisateur Page 131