Failed to detect pattern for "llvm.bswap.i64" in some of my test cases with Clang 12, but no such problem with Clang 11

IR & Optimizations
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Thanks for the bug report - looks like its still happening on trunk: Compiler Explorer

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Raised issue: Failed to detect pattern for “llvm.bswap.i64” in some of my test cases with Clang 12, but no such problem with Clang 11 · Issue #60690 · llvm/llvm-project · GitHub