Benjamin Kramer 7746eb62fb 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".

llvm-svn: 150961

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

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