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Divide and Allocate: The Trace Register Allocation Framework

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(1)Divide and Allocate: The Trace Register Allocation Framework Josef Eisl. Trace Register Allocation Framework.  Register allocation at run time  Compilation units are potentially large. Global Liveness. | Profiling information available!. Allocation Strategies. Policy. Build Traces. switch. foreach trace. Bottom-Up Linear Scan. Strategy 1 Trivial Trace Bottom-Up Strategy 2 Fast Strategy. Research Questions. allocate trace. Problem with Global Approaches hot path. B1. B2 B3. B4. B6. B8. hot global goal . 50% 80%. . . .Scan Linear. RQ1: …reach the same code quality? (vs. state-of-the-art global allocator).  Focus on the Hot Parts T1. T2. T3. RQ2: …be as fast as a global allocator?. T4. (for the same quality of allocation). B1 good quality code. RQ3: …enable fine-grained trade-offs? B5. B2 B3. B4. B6. (compile-time vs. allocation quality) B7. short allocation time. Results – Evaluation in GraalVM. B8. Ratio (p). . “Use Linear Scan for the first p% Traces”. perf top. 130% 125% 120% 115% 110% 105% 100% 95% 90% 85% 80% 75% 70%. Advantages of Traces. Global Scope not Adequate. .  Not all parts are equally important  Compile time does not scale. Easy to compute Simple structure. 90% 85% 80% 75% 70% 65% 60% 55% 50%. time bot.  Eisl, Josef, Stefan Marr, et al. (2017). “Trace Register Allocation Policies: Compile-time vs. Performance Trade-offs”. ManLang 2017..  josef.eisl@jku.at. RQ3. 110% 105% 100% 95% 90% 85% 80% 75% 70% 65% 60% 55% 50%. RQ2 Global- TraceLSRA LSRA. Ratio p=0.8. Ratio p=0.5. Ratio BottomUp p=0.3. GLSRA TLSRADaCapo Ratio8 Ratio3 and Ratio5 Scala-Dacapo..  Eisl, Josef, Matthias Grimmer, et al. (2016). “Trace-based Register Allocation in a JIT Compiler”. PPPJ ’16..  @zapstercc. RQ1. perf bot time top110% 105% time ref100% 95%. Linear sequence of code, no lifetime holes.  https://github.com/oracle/graal. 130% 125% 120% 115% 110% 105% 100% 95% 90% 85% 80% 75% 70%. perf ref. Single pass over basic blocks, based on profiling. .  Cold parts can influence hot parts. Can the trace-based approach…. Resolve Data Flow. Benchmark Execution Time Register Allocation Benchmark Time Execution Time. Result accessArray( Object[] o, int i) { Result r = new Result(); //B1 B5 if (o != null) { //B2 if (i >= 0) { //B3 B7 r.val = o[i]; } else { //B4 r.ex = idxOOB(o, i); hot } } else { //B5 if (shldDeopt()) {//B6 cold r.frm = toInt(o, i); } else { //B7 cold r.ex = npe(); } 50% } //B8 return r; 20% }. code quality compile time    . . Just-in-Time Register Allocation. Institute for System Software. Values relative to TraceLSRA mean.  Lower is better..  http://ssw.jku.at/General/Staff/Eisl/. BU.

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