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[RyuJIT][LSRA] Restructure LinearScan::isAssigned to improve efficiency #8758

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[RyuJIT][LSRA] Restructure LinearScan::isAssigned to improve efficiency#8758
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JitThroughputCLR JIT issues regarding speed of JIT itselfarea-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIenhancementProduct code improvement that does NOT require public API changes/additionstenet-performancePerformance related issue
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@CarolEidt

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@CarolEidt
CarolEidt
opened on Aug 17, 2017

bool LinearScan::isAssigned(RegRecord* regRec ARM_ARG(RegisterType newRegType)) calls bool LinearScan::isAssigned(RegRecord* regRec, LsraLocation lastLocation ARM_ARG(RegisterType newRegType)) with lastLocation set to MaxLocation. This doesn't make it easy for the C++ compiler to optimize away the check in this case.

category:throughput
theme:register-allocator
skill-level:intermediate
cost:medium

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    JitThroughputCLR JIT issues regarding speed of JIT itselfarea-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIenhancementProduct code improvement that does NOT require public API changes/additionstenet-performancePerformance related issue

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