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...ing very large, > (probably) machine-generated blocks of straight-line code, give the > Local and BigBlock allocators a try, especially if you're JITing > things and compile time is important. I looked at your code. And I see some things that could be significantlty sped up, e.g. - InsnTimes handling. I have the feeling, this map can be eliminated completely. - use of the VRegReadTable. The vector of read occurences can be shortened every time, you processed the corresponding intruction. This makes it shorter and makes searches inside this vector faster, thus making chooseReg much f...

Hi everyone, Quick summary: LLVM now has a new register allocator particularly suitable for compiling (very) large, machine-generated functions. Longer story: I've recently been using LLVM in an application that involves JITing fairly large functions that have no control flow - they're just flat sequences of instructions, anywhere from 100 to 10000+ in size. (The control flow is

...her 10~20% on top of that, with the gap more or less proportional to the size of the block. For blocks with <200 instructions, local and bigblock tend to produce more or less the same code. > I looked at your code. And I see some things that could be > significantlty sped up, e.g. > - InsnTimes handling. I have the feeling, this map can be eliminated > completely. Absolutely, I agree it should go. I was in a hurry, and my first attempt at eliminating it didn't work, so I just put it back. I'll get around to killing it again at some point. > - use of the VRegReadTable. T...