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2016 Jun 10
4
Early CSE clobbering llvm.assume
As of llvm 3.8, the early CSE pass seems to remove llvm.assume intrinsics.
Is this the expected behavior?
I've attached as small-ish example of this happening in my production code.
$ opt -early-cse before-early-cse.ll -S > after-early-cse.ll
Note the use of the assume intrinsic indicating that the loaded value
%channels equals 3. In a later pass I replace the load instruction with