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Many compilers use all three at dierent phases winter

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Unformatted text preview: ; b) {! Dan Grossman Dan Grossman print(“increase”);! Fall 2011 Fall ++;! a 2011 LCD LCD }! print(“done”);! LCD: Loop-Carried Dependence Winter 2013 UW CSE 401 (Michael Ringenburg) 32 Linear IRs •  •  •  CSE341: Programming Languages CSE341: Programming Pseudo- code for some Languages achine abstract m Lecture 1 Lecture 1 Level of [email protected] varies Mechanics Course Course Mechanics Simple, Mompact data structures c L Variable Bindings Bindings ML Variable –  Commonly used: arrays, linked structures Dan Grossman Dan Grossman •  Examples: 3- address code, stack machine code Fall 2011 Fall 2011 •  Fairly compact •  Compiler can control reuse of names – clever choice can reveal optimizions. •  ILOC code Winter 2013 T1 T2 T3 T4 T5 ß། ß། ß། ß། ß། 2 b T1 * T2 a T4 – T3 •  Each instruction: pop operands, push result. •  Very compact •  Easy to create interpreter. •  Java bytecode UW CSE 401 (Michael Ringenburg) push 2 push b multiply push a subtract 33 [email protected] Levels in Linear IR CSE341: Programming CSE341: Programming Languages Languages •  Linear IRs can also be close to the source Lecture 1 Lecture 1 language, very low- level, or somewhere in Course Mechanics C between. ourse Mechanics ML Variable Bindings ML Variable Bindings •  E.g., Linear IRs for C array rGrossman a[i][j+2] eference Dan Dan Grossman Fall 2011 Fall 2011 –  High- level: t1 ← a[i,j+2] Winter 2013 UW CSE 401 (Michael Ringenburg) 34 IRs for a[i,j+2], cont. CSE341: Programming Languages CSE341: Programming Languages •  Medium- level •  Low- level Lecture 1 Lecturefp- 4] t1 ← j...
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