search for: lburg

...llvm) Instruction selection: 12 The ladyvm JVM paper noted the same problem: http://vmkit.llvm.org/ladyvm.html So I did a quick experiment with llvm and lcc (http://www.cs.princeton.edu/software/lcc), in order to see how much faster instruction selection could be. lcc uses a BURG-type (called lburg) instruction-selector. The following is for x86/linux (ubuntu) I am interested in JIT performance so I have only counted user+sys time. Compiling a small test program (the dhrystone benchmark): lcc (Fraser and Hanson) (after pre-processing): 4ms. llc : 16...

...t you've posted several numbers comparing > compile times with lcc, but no numbers comparing the quality of > the generated code yet :-). Of course, llvm generated code is faster :) But lcc doesn't do many optimisations and uses a fairly simple local register allocator. However, the lburg instruction selector is optimal (for trees, not for DAGs) and very fast. It was a fast instruction selector for llvm that I was hoping for, the optimisation passes and register allocator are already quite fast. >>> Do you have time to do more detailed profiling? It might be >>&g...