2 files changed, 28 insertions, 3 deletions
diff --git a/llvm/test/Transforms/LoopVectorize/AArch64/loop-vectorization-factors.ll b/llvm/test/Transforms/LoopVectorize/AArch64/loop-vectorization-factors.ll
index c7ced757581..e090ddf1d1a 100644
--- a/llvm/test/Transforms/LoopVectorize/AArch64/loop-vectorization-factors.ll
+++ b/llvm/test/Transforms/LoopVectorize/AArch64/loop-vectorization-factors.ll
@@ -235,10 +235,13 @@ for.body:                                         ; preds = %entry, %for.body
 }
 
 ; CHECK-LABEL: @add_phifail2(
-; CHECK: load <16 x i8>, <16 x i8>*
-; CHECK: add nuw nsw <16 x i32>
-; CHECK: store <16 x i8>
+; CHECK-NOT: load <16 x i8>, <16 x i8>*
+; CHECK-NOT: add nuw nsw <16 x i32>
+; CHECK-NOT: store <16 x i8>
 ; Function Attrs: nounwind
+; FIXME: Currently, if we vectorize this loop, we will generate incorrect code
+; if %len evenly divides VF. Vectorized loop code gen returns a_phi = p[len -1],
+; whereas it should be the previous value a_phi = p[len -2]
 define i8 @add_phifail2(i8* noalias nocapture readonly %p, i8* noalias nocapture %q, i32 %len) #0 {
 entry:
   br label %for.body
diff --git a/llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll b/llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll
index 7803e74679f..9155820216b 100644
--- a/llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll
+++ b/llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll
@@ -349,3 +349,25 @@ scalar.body:
 for.end:
   ret void
 }
+
+; FIXME: we can vectorize this first order recurrence, by generating two
+; extracts - one for the phi `val.phi` and other for the phi update `addx`.
+; val.phi at end of loop is 94 + x.
+; CHECK-LABEL: extract_second_last_iteration
+; CHECK-NOT: vector.body
+define i32 @extract_second_last_iteration(i32* %cval, i32 %x)  {
+entry:
+  br label %for.body
+
+for.body:
+  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
+  %val.phi = phi i32 [ 0, %entry ], [ %addx, %for.body ]
+  %inc = add i32 %inc.phi, 1
+  %bc = zext i32 %inc.phi to i64
+  %addx = add i32 %inc.phi, %x
+  %cmp = icmp eq i32 %inc.phi, 95
+  br i1 %cmp, label %for.end, label %for.body
+
+for.end:
+  ret i32 %val.phi
+}