W90210F Datasheet, PDF(52/67 Page) Winbond – PA-RISC EMBEDDED CONTROLLER

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W90210F Datasheet, PDF (52/67 Pages) Winbond – PA-RISC EMBEDDED CONTROLLER

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W90210F

Halfword parallel shift right and add

Format:

HSHRADD

r1,k,r2,t or

HSR1ADD

r1,r2,t

HSR2ADD

r1,r2,t

HSR3ADD

r1,r2,t

HSHRADD

0:5

5:10

11:15

26 27:31

02 r2 r1 0 0 5 k 0 t

5 5 3 1 4 21 5

Purpose: To perform multiple pairs of halfword shift right and add operations in parallel with

saturation.

Description:Each halfword of GR r1 is shifted right by k bits, and then added to the corresponding

halfword of GR r2. The bits shifted into each halfword, from the left, are the same as the

sign bit for each halfword. Signed saturation is performed on the addition, which forces each

halfword result to either the maximum or the minimum value, if the result would have been

out of range. The halfword results are placed in GR t. The shift amount is either 1, 2, or 3,

and is encoded in the k field of the instruction.

All operands are treated as signed numbers, and the results are signed numbers. Signed

saturation is performed.

Operation: GR[t]{0..15} â arshift(GR[r1]{0..15},k) + GR[r2]{0..15};

GR[t]{16..31} â arshift(GR[r1]{16..31},k) + GR[r2]{16..31};

if (max_signed_sat_L)

GR[t]{0..15} â 0x7FFF;

else if (min_signed_sat_L)

GR[t]{0..15} â 0x8000;

if (max_signed_sat_R)

GR[t]{16..31} â 0x7FFF;

else if (min_signed_sat_R)

GR[t]{16..31} â 0x8000;

Exceptions: None.

The above information is the exclusive intellectual property of Winbond Electronics Corp. and shall not be disclosed, distributed or reproduced without permission from Winbond.

Version 1.4, 10/8/97

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