While running analyze next statement dan grossman dan

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Unformatted text preview: chael Ringenburg) A-27 Back End Structure CSE341: Programming CSE341: Programming Languages Languages •  Typically split into two major parts Lecture 1 Lecture 1 –  “Op7miza7on” – code improvements, e.g., Course Mechanics Course Mechanics •  Common subexpression elimina7on: ML Variable Bindings ML (x+y) Variable!Bindings x + y; t * t! * (x+y) t= Dan Grossman Dan Grossman 3 * x! •  Constant folding: (1+2) * all! F x 2011 Fall 2011 •  Op7miza7on phases oven interleaved with analysis phases to beker understand program meaning/know what transforma7ons preserve that meaning –  Target Code Genera7on (machine specific) •  Instruc7on selec7on & scheduling, register alloca7on Winter 2013 UW CSE 401 (Michael Ringenburg) A-28 The Result •  Input •  Output if (x >= y)! y = 42;! •  AST mov cmp jl mov L17:! Parser ifStmt >= ID(x) Winter 2013 eax,[ebp+16]! eax,[ebp-8]! L17! [ebp-8],42! Back End assign ID(y) ID(y) INT(42) UW CSE 401 (Michael Ringen...
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