6Id2xa-Ch8b

6Id2xa-Ch8b - 1 Intermediate Code Generation Part II...

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Unformatted text preview: 1 Intermediate Code Generation Part II Chapter 6 (1 st ed Chapter 8) COP5621 Compiler Construction Copyright Robert van Engelen, Florida State University, 2007-2011 2 Advanced Intermediate Code Generation Techniques Reusing temporary names Addressing array elements Translating logical and relational expressions Translating short-circuit Boolean expressions and fow-oF-control statements with backpatching lists Translating procedure calls 3 Reusing Temporary Names Evaluate E 1 into t1 Evaluate E 2 into t2 t3 := t1 + t2 E 1 + E 2 Modify newtemp () to use a stack: Keep a counter c , initialized to 0 Decrement counter on each use of a $ i in a three-address statement newtemp () returns temporary $ c++ (that is, c is post incremented ) If t1 no longer used, can reuse t1 instead of using new temp t3 generate 4 Reusing Temporary Names (contd) x := a * b + c * d - e * f $ := a * b $ 1 := c * d $ := $0 + $1 $ 1 := e * f $ := $0- $1 x := $0 0 1 1 1 2 2 1 1 1 2 2 1 1 c c decr c incr Statement 5 Addressing Array Elements: One-Dimensional Arrays = base A + ( i- low ) * w = i * w + c where c = base A- low * w with low = 10; w = 4 A : array [10..20] of integer; := A[i] t1 := c // c = base A - 10 * 4 t2 := i * 4 t3 := t1[t2] := t3 6 Addressing Array Elements: Multi-Dimensional Arrays A : array [1..2,1..3] of integer; low 1 = 1, low 2 = 1, n 1 = 2 , n 2 = 3 , w = 4 A[1,1] A[1,2] A[1,3] A[2,1] A[2,2] A[2,3] Row-major A[1,1] A[2,1] A[1,2] A[2,2] A[1,3] A[2,3] Column-major base A base A 7 Addressing Array Elements: Multi-Dimensional Arrays = base A + (( i 1- low 1 ) * n 2 + i 2 - low 2 ) * w = (( i 1 * n 2 ) + i 2 ) * w + c where c = base A- (( low 1 * n 2 ) + low 2 ) *...
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This note was uploaded on 02/01/2012 for the course COP 5621 taught by Professor Vanengelen during the Spring '11 term at FSU.

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6Id2xa-Ch8b - 1 Intermediate Code Generation Part II...

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