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Page 1: ygW`BEDAFC=R[ Y FCS GjF^ygS Gf …tway/publications/wayDiss02.pdf · ©n ª ä å£æ/çéèQê ê å ëzì+í îwæ ïwïbï\ïwïbïwïwïbïwïbïwïwïbï\ïwïbïwïbïwïwïbïwïbïwï\ïbïwïwïbïwïQð

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Page 28: ygW`BEDAFC=R[ Y FCS GjF^ygS Gf …tway/publications/wayDiss02.pdf · ©n ª ä å£æ/çéèQê ê å ëzì+í îwæ ïwïbï\ïwïbïwïwïbïwïbïwïwïbï\ïwïbïwïbïwïwïbïwïbïwï\ïbïwïwïbïwïQð

Symbol ManagerCode Generator

Intermediate

Parser

Source Program

Code Generator

Error Handler

Target Program

Scanner

Optimizer

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Page 29: ygW`BEDAFC=R[ Y FCS GjF^ygS Gf …tway/publications/wayDiss02.pdf · ©n ª ä å£æ/çéèQê ê å ëzì+í îwæ ïwïbï\ïwïbïwïwïbïwïbïwïwïbï\ïwïbïwïbïwïwïbïwïbïwï\ïbïwïwïbïwïQð

DFA1 1OPT DFA2 OPT2

PrepassScheduling

CodeGeneration

PostpassSchedulingAllocation

Register

n OPTnDFA

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Page 30: ygW`BEDAFC=R[ Y FCS GjF^ygS Gf …tway/publications/wayDiss02.pdf · ©n ª ä å£æ/çéèQê ê å ëzì+í îwæ ïwïbï\ïwïbïwïwïbïwïbïwïwïbï\ïwïbïwïbïwïwïbïwïbïwï\ïbïwïwïbïwïQð

...

void X(a){ float b,c,d

{float Y(v,w)

b=sqrt(a)

c=Y(a,b)

==

==

bar

rier

==

==

==

float b

b=sqrt(v)

return b}

...

}

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void X(a){ float b,c,d

{ float b

float Y(v,w)

float b,c,d

b=sqrt(a)

c=Y(a,b) ...

b=sqrt(v) ...

return b}}

void X(a){ float b,c,d

{ float b

float Y(v,w)

float b,c,d

b=sqrt(a)

c=Y(a,b) ...

...

return b}}

b=w

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Page 36: ygW`BEDAFC=R[ Y FCS GjF^ygS Gf …tway/publications/wayDiss02.pdf · ©n ª ä å£æ/çéèQê ê å ëzì+í îwæ ïwïbï\ïwïbïwïwïbïwïbïwïwïbï\ïwïbïwïbïwïwïbïwïbïwï\ïbïwïwïbïwïQð

void X(a){ float b,c,d

}

{ float b

float Y(v,w)

float b,c,d

b=sqrt(a)

c=Y(a,b) ...

d=Y(b,a)

b=sqrt(v) ...

return b}

...

} d=b3

b3=sqrt(b) ...

void X(a){ float b,c,d,b2,b3

float Y(v,w){

b=sqrt(a)

float b

b=sqrt(v)

} return b ... b2=sqrt(a)

... c=b2

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void X(a){ float b,c,d

}

{ float b

float Y(v,w)

float b,c,d

b=sqrt(a)

c=Y(a,b) ...

b=sqrt(v) ...

return b} d=Y(4,b)

{ float b

float Y(v,w)

b=sqrt(v) ...

return b}

{ float b

...

return b}

float Y2(v,w)

b=2

void X(a){ float b,c,d

}

float b,c,d

b=sqrt(a)

c=Y(a,b) ...

d=Y2(4,b)

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Interproceduraldata flow analysis

Less

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More

Compilation time & memory

Cloning Inlining

Code growth

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Code GeneratorIntermediate

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Code GeneratorIntermediate

Optimizer

InlinerDemand-driven

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Target Program

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Parser

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recursive

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call

call

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entry

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call B

proc A

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case 1: local Conly

case 4: local B,

pass-through B

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exit

entry

exit

proc B proc C

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function

basic block

region

branch edge

jump edge

Key:

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Code GeneratorIntermediate

Optimizer

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Target Program

Scanner

Parser

Code Generator

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Profiler

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recursive

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region

call

call

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1st order heuristic

2nd order heuristic

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