Simon Pilgrim 478b22d95a [CGP] despeculateCountZeros - Don't create is-zero branch if cttz/ctlz source is known non-zero ...

If value tracking can confirm that the cttz/ctlz source is known non-zero then we don't need to create a branch (which DAG will struggle to recover from).

Differential Revision: https://reviews.llvm.org/D106685

2021-07-24 13:11:49 +01:00

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