By Philipp Klaus Krause (auth.), Ranjit Jhala, Koen De Bosschere (eds.)
This booklet constitutes the court cases of the twenty second foreign convention on Compiler building, CC 2013, held as a part of the ecu Joint meetings on thought and perform of software program, ETAPS 2013, which came about in Rome, Italy, in March 2013. The thirteen papers provided during this booklet have been conscientiously reviewed and chosen from fifty three submissions. they've been prepared into 5 topical sections on check in allocation, pointer research, info and knowledge move, desktop studying, and refactoring.
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Extra resources for Compiler Construction: 22nd International Conference, CC 2013, Held as Part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2013, Rome, Italy, March 16-24, 2013. Proceedings
Sample text
On the other hand, restricting our optimal algorithm to perform only local instruction scheduling leads to consistent improvements in performance over a state-of-the art heuristic scheduler. Finding a restricted form of GCMS that more carefully balances the needs of the spiller against aggressive code motion is future work. : Dependence-conscious Global Register Allocation. In: Gutknecht, J. ) Programming Languages and System Architectures. LNCS, vol. 782, pp. 125–136. : Register reuse scheduling.
Virtreg_def_in(A, ADef, ADefBlock), virtreg_def_in(B, BDef, BDefBlock), % A has a use in a block different from its def . virtreg_use(A, AUse, AUseBlock), ADefBlock \= AUseBlock, % There is a non−empty path from A’s def to B’s def... ADefBlock \= BDefBlock, cfg_forward_path(ADefBlock, BDefBlock), % ... and a path from B’s def to A’s use that does not pass % through a redefinition of A. That is, B is on a path from A’s % def to its use. cfg_loopypath_notvia(BDefBlock, AUseBlock, ADefBlock), % There is an overlap that might be avoided if at least one of % these instructions were in a different block .
If N is the total number of instructions, this constraint can be written as: instr i − instr j > N · arc i,j − N (5) If arc i,j is selected, this reduces to instr i − instr j > 0, i. , instr i > instr j . Otherwise, it is instr i −instr j > −N , which is always true for 0 ≤ instr i , instr j < N . These constraints ensure that the instructions along every path in the dependence graph are always topologically ordered, i. , there is no cycle in the graph. Finally, we must take interactions between dependence arcs and instruction placement into account.