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2016 Nov 15
9
Non-determinism in LLVM codegen
Everyone,
There is non-determinism in LLVM codegen in the following scenarios:
1. Between back-to-back runs of the same LLVM toolchain
2. Between Release vs Release+Asserts toolchains
3. Between Linux vs Windows toolchains
The main reasons for the non-determinism in codegen are:
1. Iteration of unordered containers (like SmallPtrSet, DenseMap, etc)
where the iteration order is undefined
2.