[LLVMdev] question in LLVM IR

[kqyang]

hi all

  I read LLVM manual, and have a question in the LLVM IR.
The IR is low-level SSA based instruction set.

I want to know what the difference between the LLVM IR and SSA form? 
They are same, similar to tree-ssa of GCC convertion GIMPLE tree to SSA and convert back when optimizations finish?  
or just attach the SSA info in the LLVM IR?

Thanks for your feedback.

-Joey
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