Nikita Popov a13c0f62c3 [InstSimplify] Fold x*C1/C2 <= x (PR48744) ...

We can fold x*C1/C2 <= x to true if C1 <= C2. This is valid even
if the multiplication is not nuw: https://alive2.llvm.org/ce/z/vULors

The multiplication or division can be replaced by shifts. We don't
handle the case where both are shifts, as that should get folded
away by InstCombine.

2021-01-17 16:02:55 +01:00

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