[llvm] [LV][EVL] Disable fixed-order recurrence idiom with EVL tail folding. (PR #122458)

[Mel Chen via llvm-commits]

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@@ -0,0 +1,561 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -passes=loop-vectorize \
+; RUN: -prefer-inloop-reductions \
+; RUN: -force-tail-folding-style=data-with-evl \
+; RUN: -prefer-predicate-over-epilogue=predicate-dont-vectorize \
+; RUN: -mtriple=riscv64 -mattr=+v,+f -S < %s| FileCheck %s --check-prefix=IF-EVL
+
+; RUN: opt -passes=loop-vectorize \
+; RUN: -prefer-inloop-reductions \
+; RUN: -force-tail-folding-style=none \
+; RUN: -prefer-predicate-over-epilogue=predicate-else-scalar-epilogue \
+; RUN: -mtriple=riscv64 -mattr=+v,+f -S < %s| FileCheck %s --check-prefix=NO-VP
+
+define void @first_order_recurrence(ptr noalias %A, ptr noalias %B, i64 %TC) {
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Mel-Chen wrote:

3abbcc6bd609edb24ec8527344b1ae6368296ba2

https://github.com/llvm/llvm-project/pull/122458