Benjamin Kramer d2348639e6 InstCombine: Make OptimizePointerDifference more aggressive. ...

- Ignore pointer casts.
- Also expand GEPs that aren't constantexprs when they have one use or only constant indices.

- We now compile "&foo[i] - &foo[j]" into "i - j".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150961 91177308-0d34-0410-b5e6-96231b3b80d8

2012-02-20 14:34:57 +00:00

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