Instruction: Reverse LSBs of value and zero-extend.

REV Value, < # > Bits

Result: Value has lower 32 - Bits of its LSBs reversed and upper bits cleared.

Value (d-field) is the register containing the value whose bits are reversed.
Bits (s-field) is a register or a 5-bit literal whose value subtracted from 32, (32 - Bits), is the number of Value's LSBs to reverse. The upper Bits MSBs of Value are cleared.

Opcode Table:

–INSTR– ZCRI –CON– –DEST– –SRC–	Z Result	C Result	Result	Clocks
001111 001i 1111 ddddddddd sssssssss	Result = 0	D[0]	Written	4

Concise Truth Table:

In					Out
Destination	Source	Z	C	Effects	Destination	Z	C
$8421_DECA; -2,078,155,062	$0000_001F; 31	-	-	wz wc	$0000_0000; 0	1	0
$8421_DECA; -2,078,155,062	$0000_001C; 28	-	-	wz wc	$0000_0005; 5	0	0
$8421_DECA; -2,078,155,062	$0000_0018; 24	-	-	wz wc	$0000_0053; 83	0	0
$8421_DECA; -2,078,155,062	$0000_0010; 16	-	-	wz wc	$0000_537B; 21,371	0	0
$8421_DECA; -2,078,155,062	$0000_0000; 0	-	-	wz wc	$537B_8421; 1,400,603,681	0	0
$4321_8765; 1,126,270,821	$0000_001C; 28	-	-	wz wc	$0000_000A; 10	0	1
$4321_8765; 1,126,270,821	$0000_0018; 24	-	-	wz wc	$0000_00A6; 166	0	1
$4321_8765; 1,126,270,821	$0000_0010; 16	-	-	wz wc	$0000_A6E1; 42,721	0	1
$4321_8765; 1,126,270,821	$0000_0000; 0	-	-	wz wc	$A6E1_84C2; -1,495,169,854	0	1

Explanation

REV (Reverse) reverses the lower (32 - Bits) of Value's LSB and clears the upper Bits of Value's MSBs.

If the WZ effect is specified, the Z flag is set (1) if the resulting Value equals zero. If the WC effect is specified, the C flag is set equal to Value's original bit 0. The result is written to Value unless the NR effect is specified.