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mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-16 16:31:04 +00:00
Chris Lattner 41dc0fcb68 Teach masked value is zero about add and sub, and use MVIZ to
simplify things like (X & 4) >> 1 == 2  --> (X & 4) == 4.

since it is obvious that the shift doesn't remove any bits.



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