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 />
x = a * b + c * d - e * f;<br />
S<br />
id =<br />
x<br />
E * E<br />
id<br />
a<br />
id<br />
b<br />
<strong>CSCI</strong> <strong>565</strong> - <strong>Compiler</strong> <strong>Design</strong><br />
Assignment: Example<br />
E<br />
id<br />
c<br />
E<br />
E + E<br />
E<br />
*<br />
id<br />
d<br />
E<br />
-<br />
E<br />
E * E<br />
id<br />
e<br />
id<br />
f<br />
<strong>Spring</strong> <strong>2011</strong><br />
// c = 0<br />
t1 = e * f; // c = 1<br />
t2 = c * d; // c = 2<br />
t1 = t2 - t1; // c = 1<br />
t2 = a * b; // c = 2<br />
t1 = t2 + t1; // c = 1<br />
x = t1; // c = 0<br />
• Only 2 Temporary Variables and<br />
hence only 2 registers are Needed
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