[llvm] [LoopVectorize] Generate wide active lane masks (PR #147535)

[David Sherwood via llvm-commits]

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@@ -0,0 +1,165 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --filter-out-after "^middle.block:" --version 4
+; RUN: opt -S -passes=loop-vectorize -scalable-vectorization=off -prefer-predicate-over-epilogue=predicate-dont-vectorize -enable-wide-lane-mask \
+; RUN:    -force-vector-width=4 -force-vector-interleave=0 < %s | FileCheck %s -check-prefix CHECK-UF0
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david-arm wrote:

I think this should probably be `-force-vector-interleave=1` (and same for other test files), and then use the check prefix `CHECK-UF1`. That's because in reality the interleave count will be 1.

https://github.com/llvm/llvm-project/pull/147535