[llvm] [CodeGen] Optimize switch on ucmp/scmp to branch sequence (PR #176582)

[Yingwei Zheng via llvm-commits]

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@@ -9084,8 +9084,82 @@ bool CodeGenPrepare::makeBitReverse(Instruction &I) {
 // In this pass we look for GEP and cast instructions that are used
 // across basic blocks and rewrite them to improve basic-block-at-a-time
 // selection.
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dtcxzyw wrote:

This header comment should be put before CodeGenPrepare::optimizeBlock.

https://github.com/llvm/llvm-project/pull/176582