05ff170026
Consider a pattern like `icmp (shl nsw X, L), (add nsw (shl nsw Y, L), K)`. When the constant K is a multiple of 2^L, this can be simplified to `icmp X, (add nsw Y, K >> L)`. This patch extends canEvaluateShifted to support `Instruction::Add` and updates its signature to accept `Instruction::BinaryOps` instead of a boolean. This change allows the function to distinguish between LShr and AShr requirements, ensuring that information is preserved according to the signedness and overflow flags (nsw/nuw) of the operands. The logic is integrated into `foldICmpCommutative` to enable peeling off matching shifts from both sides of a comparison even when an offset is present. Fixes: #163110
The LLVM Compiler Infrastructure
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