[llvm] [Reland][ValueTracking] Improve Bitcast handling to match SDAG (PR #145223)

Simon Pilgrim via llvm-commits llvm-commits at lists.llvm.org
Mon Jul 28 06:10:12 PDT 2025


RKSimon wrote:

> Can you do something with this: https://alive2.llvm.org/ce/z/yaFWKg -
> 
> instcombine will try to replace a ashr with lshr if it can confirm all the signbits are known zero

@abhishek-kaushik22 any progress?

https://github.com/llvm/llvm-project/pull/145223


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