Spring 2011 CSCI 565 - Compiler Design
Spring 2011 CSCI 565 - Compiler Design
Spring 2011 CSCI 565 - Compiler Design
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Pedro Diniz<br />
pedro@isi.edu<br />
DO J = 1, N<br />
A[I,J] = A[I,J] + B[I,J]<br />
END DO<br />
<strong>CSCI</strong> <strong>565</strong> - <strong>Compiler</strong> <strong>Design</strong><br />
• Sophisticated: Move common calculations out of loop<br />
R1 = I x floatsize<br />
c = len 1 x floatsize ! Compile-time constant<br />
R2 = baseA 0 + R1<br />
R3 = baseB 0 + R1<br />
DO J = 1, N<br />
a = J x c<br />
R4 = R2 + a<br />
R5 = R3 + a<br />
MEM(R4) = MEM(R4) + MEM(R5)<br />
END DO<br />
<strong>Spring</strong> <strong>2011</strong><br />
Array Address Calculations in a Loop
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