1 files changed, 28 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopVectorize/SystemZ/load-scalarization-cost-1.ll b/llvm/test/Transforms/LoopVectorize/SystemZ/load-scalarization-cost-1.ll
new file mode 100644
index 00000000000..fbf8b114542
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/SystemZ/load-scalarization-cost-1.ll
@@ -0,0 +1,28 @@
+; RUN: opt -mtriple=s390x-unknown-linux -mcpu=z13 -loop-vectorize \
+; RUN:   -force-vector-width=4 -debug-only=loop-vectorize \
+; RUN:   -enable-interleaved-mem-accesses=false -disable-output < %s 2>&1 \
+; RUN:   | FileCheck %s
+; REQUIRES: asserts
+;
+; Check that a scalarized load does not get a zero cost in a vectorized
+; loop. It can only be folded into the add operand in the scalar loop.
+
+define i32 @fun(i64* %data, i64 %n, i64 %s, i32* %Src) {
+entry:
+  br label %for.body
+
+for.body:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+  %acc = phi i32 [ 0, %entry ], [ %acc_next, %for.body ]
+  %gep = getelementptr inbounds i32, i32* %Src, i64 %iv
+  %ld = load i32, i32* %gep
+  %acc_next = add i32 %acc, %ld
+  %iv.next = add nuw nsw i64 %iv, 2
+  %cmp110.us = icmp slt i64 %iv.next, %n
+  br i1 %cmp110.us, label %for.body, label %for.end
+
+for.end:
+  ret i32 %acc_next
+
+; CHECK: Found an estimated cost of 4 for VF 4 For instruction:   %ld = load i32, i32* %gep
+}