[tree-ssa] Switch stmts and inserting on edge

[Chris Lattner]

On Sat, 31 May 2003, Zack Weinberg wrote:

> There's a whole portfolio of target-independent transformations that
> it would be nice to see done on SWITCH_EXPRs at the tree level.  For

Another example is Roger Sayle's recent change to expand some switch
statements a shift with bitwise and instructions... which can also be
performed at the tree level.

-Chris

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