[llvm] [LV] Add tests for excluded cases in epiloge tail-folding (PR #217364)

[David Sherwood via llvm-commits]

================
@@ -1,23 +1,45 @@
 ; REQUIRES: asserts
-; RUN: opt -S < %s -p loop-vectorize -debug-only=loop-vectorize --disable-output \
-; RUN: -epilogue-tail-folding-policy=prefer-fold-tail -pass-remarks-analysis=loop-vectorize 2>&1 | FileCheck %s
 
-; RUN: opt -S < %s -p loop-vectorize -debug-only=loop-vectorize -enable-epilogue-vectorization=false \
-; RUN: --disable-output -epilogue-tail-folding-policy=prefer-fold-tail -pass-remarks-analysis=loop-vectorize 2>&1 \
-; RUN: | FileCheck %s --check-prefix=CHECK-DISABLED-EPILOG
+; RUN: opt -S -p loop-vectorize -debug-only=loop-vectorize --disable-output -epilogue-tail-folding-policy=prefer-fold-tail \
+; RUN: -pass-remarks-analysis=loop-vectorize -force-vector-width=16 -epilogue-vectorization-force-VF=8 < %s 2>&1 | FileCheck %s
 
-define void @test_epilogue_tf(ptr %A, i64 %n) {
+; RUN: opt -S -p loop-vectorize -debug-only=loop-vectorize -enable-epilogue-vectorization=false \
+; RUN: --disable-output -force-vector-width=16 -epilogue-vectorization-force-VF=8 -epilogue-tail-folding-policy=prefer-fold-tail \
+; RUN: -pass-remarks-analysis=loop-vectorize < %s 2>&1 | FileCheck %s --check-prefix=CHECK-DISABLED-EPILOG
+
+; RUN: opt -S -p loop-vectorize -debug-only=loop-vectorize --disable-output -epilogue-tail-folding-policy=prefer-fold-tail -force-vector-width=16 \
+; RUN:  -pass-remarks-analysis=loop-vectorize < %s 2>&1 | FileCheck %s --check-prefix=CHECK-NO-FORCED-MAIN-VF
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david-arm wrote:

Shouldn't this be `CHECK-NO-FORCED-EPILOGUE-VF` since you're forcing the main VF with `-force-vector-width=16`?

https://github.com/llvm/llvm-project/pull/217364