[b][u]compiler tactics:[/u][/b] [list] [li]delayed compilation[/li] [li]tiered compilation[/li] [li][url=http://java.sun.com/developer/technicalArticles/Networking/HotSpot/onstack.html]on-stack replacement[/url][/li] [li]delayed re-optimization[/li] [li][url=http://en.wikipedia.org/wiki/Dependency_graph]program dependence[/url] graph representation[/li] [li][url=http://en.wikipedia.org/wiki/Static_single_assignment_form]static single assignment representation[/url][/li] [/list] [b][u]proof-based techniques:[/u][/b] [list] [li]exact [url=http://en.wikipedia.org/wiki/Type_inference]type inference[/url][/li] [li]memory value inference[/li] [li]memory value tracking[/li] [li][url=http://en.wikipedia.org/wiki/Constant_propagation]constant folding[/url][/li] [li]reassociation[/li] [li]operator [url=http://en.wikipedia.org/wiki/Strength_reduction]strength reduction[/url][/li] [li]null check elimination[/li] [li]type test strength reduction[/li] [li]type test elimination[/li] [li]algebraic simplification[/li] [li][url=http://en.wikipedia.org/wiki/Common_subexpression_elimination]common subexpression elimination[/url][/li] [li]integer range typing[/li] [/list] [b][u]flow-sensitive rewrites:[/u][/b] [list] [li]conditional [url=http://en.wikipedia.org/wiki/Constant_propagation]constant propagation[/url][/li] [li]dominating test detection[/li] [li]flow-carried type narrowing[/li] [li][url=http://en.wikipedia.org/wiki/Dead_code_elimination]dead code elimination[/url][/li] [/list] [b][u]language-specific techniques:[/u][/b] [list] [li]class hierarchy analysis[/li] [li]devirtualization[/li] [li]symbolic constant propagation[/li] [li]autobox elimination[/li] [li]escape analysis[/li] [li]scalar replacement[/li] [li]lock elision[/li] [li]lock fusion[/li] [li]de-reflection[/li] [/list] [b][u]speculative (profile-based) techniques:[/u][/b] [list] [li]optimistic nullness assertions[/li] [li]optimistic type assertions[/li] [li]optimistic type strengthening[/li] [li]optimistic array length strengthening[/li] [li]untaken branch pruning[/li] [li]optimistic N-morphic inlining[/li] [li]branch frequency prediction[/li] [li]call frequency prediction[/li] [/list] [b][u]memory and placement transformation:[/u][/b] [list] [li]expression hoisting[/li] [li]expression sinking[/li] [li]redundant store elimination[/li] [li]adjacent store fusion[/li] [li]card-mark elimination[/li] [li]merge-point splitting[/li] [/list] [b][u]loop transformations:[/u][/b] [list] [li][url=http://en.wikipedia.org/wiki/Loop_unrolling]loop unrolling[/url][/li] [li][url=http://en.wikipedia.org/wiki/Loop_splitting]loop peeling[/url][/li] [li]safepoint elimination[/li] [li]iteration range splitting[/li] [li][url=https://wikis.oracle.com/display/HotSpotInternals/RangeCheckElimination]range check elimination[/url][/li] [li]loop vectorization[/li] [/list] [b][u]global code shaping:[/u][/b] [list] [li]inlining (graph integration)[/li] [li]global code motion[/li] [li]heat-based code layout[/li] [li]switch balancing[/li] [li]throw inlining[/li] [/list] [b][u][url=http://en.wikipedia.org/wiki/Control_flow_graph]control flow graph[/url] transformation:[/u][/b] [list] [li]local [url=http://en.wikipedia.org/wiki/Instruction_scheduling]code scheduling[/url][/li] [li]local code bundling[/li] [li][url=http://en.wikipedia.org/wiki/Delay_slot]delay slot[/url] filling[/li] [li]graph-coloring [url=http://en.wikipedia.org/wiki/Register_allocation]register allocation[/url][/li] [li]linear scan [url=http://en.wikipedia.org/wiki/Register_allocation]register allocation[/url][/li] [li]live range splitting[/li] [li]copy coalescing[/li] [li]constant splitting[/li] [li]copy removal[/li] [li]address mode matching[/li] [li]instruction [url=http://en.wikipedia.org/wiki/Peephole_optimization]peepholing[/url][/li] [li][url=http://en.wikipedia.org/wiki/Data-flow_analysis]DFA[/url]-based [url=http://en.wikipedia.org/wiki/Code_generation_%28compiler%29]code generator[/url][/li] [/list] [h3]Addional resources[h3][url=https://wikis.oracle.com/display/HotSpotInternals/PerformanceTechniques]Oracle's guidance page[/url] List on the HotSpot wiki: [url=https://wikis.oracle.com/display/HotSpotInternals/PerformanceTacticIndex]here[/url]