[PATCH] D122485: [SimplifyCFG] Fold mutil cases to And mask

[chenglin.bi via Phabricator via llvm-commits]

bcl5980 added a comment.

In D122485#3448240 <https://reviews.llvm.org/D122485#3448240>, @spatel wrote:

> Let's add the baseline tests as an NFC commit now, so it is easier to see the diffs.
>
> The order of the transforms creates an interesting trade-off, so we need a test like this (and probably even more tests):
>
>   define i8 @same_value_two_case(i32 %i) {
>   entry:
>     switch i32 %i, label %default [
>     i32 -3, label %end
>     i32 5, label %end
>     ]
>   
>   default:
>     br label %end
>   
>   end:
>     %t0 = phi i8 [ 42, %default ], [ 3, %entry ], [ 3, %entry ]
>     ret i8 %t0
>   }

I'm sorry but what's the difference between this test with switch_to_and0 ? For the negative offset?


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