Arnaud A. de Grandmaison f364bc63e7 InstCombine: Improve the result bitvect type when folding (cmp pred (load (gep GV, i)) C) to a bit test. ...

The original code used i32, and i64 if legal. This introduced unneeded
casts when they aren't legal, or when the index variable i has another
type. In order of preference: try to use i's type; use the smallest
fitting legal type (using an added DataLayout method); default to i32.
A testcase checks that this works when the index gep operand is i16.

Patch by : Ahmed Bougacha <ahmed.bougacha@gmail.com>
Reviewed by : Duncan

llvm-svn: 177712

2013-03-22 08:25:01 +00:00

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