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2018-07-23cast: simplify ZEXT(ZEXT(x,N),N')Luc Van Oostenryck1-1/+0
A zero-extension following another zero-extension can always be simplified into a single zero-extension. Simplify away such instructions. Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
2018-07-23add testcases for casts & bitfield insertion/extractionLuc Van Oostenryck1-0/+14
There is several difficulties some related to unclear semantic of our IR instructions and/or type evaluation. Add testcases trying to cover this area. Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>