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Apr19 - CSE302 Compiler Design Instructor Dr Liang Cheng...

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CSE302: Compiler Design Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University April 19, 2007
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Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/19/07 Outline Recap Intermediate code generation Things related to project part II Summary
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Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/19/07 Translation of Boolean Expressions (1) S if( {B.true=newlabel(); B.false=S.next;} B) S1 {S.code= B.code || label(B.true) || S1.code if B goto L1 goto L2 L1: S1 L2: B B1 || B2 S if( {B.true=newlabel(); B.false=S.next; B1.true=B.true; B1.false=newlabel(); B2.true=B.true; B2.false=B.false;} B1||B2) {B.code= B1.code || label(B1.false) || B2.code } S1 {S.code=B.code || label(B.true) || S1.code if B1 goto L1 goto L2 L2: if B2 goto L1 goto L3 L1: S1 L3:
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Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/19/07 Translation of Boolean Expressions (2) B B1 && B2 S if( { B.true=newlabel(); B.false=S.next; B1.true=newlabel(); B1.false=B.false; B2.true=B.true; B2.false=B.false;} B1&&B2) {B.code=B1.code || label(B1.true)
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