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The test file has pairs of tests that are logically equivalent: https://rise4fun.com/Alive/2zQ %t4 = and i8 %t1, 8 %t5 = zext i8 %t4 to i16 %sh = shl i16 %t5, 2 %t6 = add i16 %sh, %t0 => %t4 = and i8 %t1, 8 %sh2 = shl i8 %t4, 2 %z5 = zext i8 %sh2 to i16 %t6 = add i16 %z5, %t0 ...so if we can fold the shift op into LEA in the 1st pattern, then we should be able to do the same in the 2nd pattern (unnecessary 'movzbl' is a separate bug I think). We don't want to do this any sooner though because that would conflict with generic transforms that try to narrow the width of the shift. Differential Revision: https://reviews.llvm.org/D60789 llvm-svn: 358622
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