llvm-project

9ea42780 - [IndVars] Hoist compares made loop-invariant to the preheader. (#241408)

[IndVars] Hoist compares made loop-invariant to the preheader. (#241408) To enable additional unswitching, hoist invariant compares into the preheader. Enables additional unswitching in a number of cases end-to-end: https://github.com/dtcxzyw/llvm-opt-benchmark-nightly/pull/1977 Alternative to requesting another LICM run (https://github.com/llvm/llvm-project/pull/215899) , just to create the invariant condition outside the loop, as here we already know it is invariant and we need to create a new instruction anyways. See also https://github.com/llvm/llvm-project/pull/238580 PR: https://github.com/llvm/llvm-project/pull/241408