Register allocation in dynamic binary translation faces increasing compilation costs as code regions grow. Researchers introduced LCCRA, a novel approach that explicitly restores guest register semantics in LLVM IR, reducing overhead while maintaining performance. The method propagates guest register values using virtual registers within basic blocks and eliminates redundant store operations through control flow analysis.

CrossDBT, an LLVM-based binary translator implementing this strategy, demonstrates impressive results across PARSEC benchmarks. When host registers are limited, the approach achieves a 5.76%-7.79% reduction in end-to-end latency and a 69.55%-74.98% reduction in register allocation time. Even in register-abundant scenarios, LCCRA delivers better performance while consistently reducing compilation overhead.

The LCCRA optimization operates at the LLVM IR level, avoiding interference with existing compiler optimizations. This makes it broadly applicable across various LLVM-based binary translators addressing different architecture translations, such as x86-64 to x86-64 and x86-64 to AArch64 scenarios. The approach specifically targets the computational cost increase that occurs as code region sizes expand.