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1002198
2009 Feb 05
2
[LLVMdev] LLVM misses some cross-MBB and loop optimizations compared to GCC
Hi,
While testing my new register allocators on some test-cases, I've
noticed that LLVM misses sometimes some optimization opportunities:
1) LocalSpiller::RewriteMBB seems not to propagate the information
about e.g. Spills between MBBs.In many cases, where MBB B1 has only
one predecessor MBB B2, B1 could reuse the information about the
physical registers that are in the live-out set of B2.