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Why SSA?


If you’ve read anything about compilers in the last two decades or so, you have almost certainly heard of SSA compilers, a popular architecture featured in many optimizing compilers, including ahead-of-time compilers such as LLVM, GCC, Go, CUDA (and various shader compilers), Swift1, and MSVC2, and just-in-time compilers such as HotSpot C23, V84, SpiderMonkey5, LuaJIT, and the Android Runtime6. SSA is hugely popular, to the point that most compiler projects no longer bother with other IRs for optimization7.

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SSA Compilers