Consider the following code fragment in a high-level language: for I in 1…100 lo

Question

Consider the following code fragment in a high-level language:

for I in 1…100 loop

Sd S + Q(I). VAL

end loop;

Assume that Q is an array of 32-byte records and the VAL field is in the first 4 bytes of each record. Using x86 code, we can compile this program fragment as follows:

MOV ECX,1 ; use register ECX to hold I

LP: IMUL EAX, ECX, 32 ; get offset in EAX

MOV EBX, Q[EAX] ; load VAL field

ADD S, EBX ; add to S

INC ECX ; increment I

CMP ECX, 101 : compare to 101

JNE LP ; loop until I = 100

I need to rewrite the code using shift instead of IMUL

Explanation / Answer

You can use the command circshift

by passing the values as parameters.

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