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Dan Gohman
d19534add9
Add a SCEV class and supporting code for sign-extend expressions.
This created an ambiguity for expandInTy to decide when to use sign-extension or zero-extension, but it turns out that most of its callers don't actually need a type conversion, now that LLVM types don't have explicit signedness. Drop expandInTy in favor of plain expand, and change the few places that actually need a type conversion to do it themselves. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37591 91177308-0d34-0410-b5e6-96231b3b80d8
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