1 files changed, 110 insertions, 0 deletions
diff --git a/test/Transforms/LoopSimplify/notify-scev.ll b/test/Transforms/LoopSimplify/notify-scev.ll
new file mode 100644
index 0000000000..ee8e2eec9b
--- /dev/null
+++ b/test/Transforms/LoopSimplify/notify-scev.ll
@@ -0,0 +1,110 @@
+; RUN: opt -indvars -S %s | FileCheck %s
+;
+; PR18384: ValueHandleBase::ValueIsDeleted.
+;
+; Ensure that LoopSimplify calls ScalarEvolution::forgetLoop before
+; deleting a block, regardless of whether any values were hoisted out
+; of the block.
+
+target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-darwin"
+
+%struct.Params = type { [2 x [4 x [16 x i16]]] }
+
+; Verify that the loop tail is deleted, and we don't crash!
+;
+; CHECK-LABEL: @t
+; CHECK-LABEL: for.cond127.preheader:
+; CHECK-NOT: for.cond127:
+; CHECK-LABEL: for.body129:
+define void @t() {
+entry:
+  br label %for.body102
+
+for.body102:
+  br i1 undef, label %for.cond127.preheader, label %for.inc203
+
+for.cond127.preheader:
+  br label %for.body129
+
+for.cond127:
+  %cmp128 = icmp slt i32 %inc191, 2
+  br i1 %cmp128, label %for.body129, label %for.end192
+
+for.body129:
+  %uv.013 = phi i32 [ 0, %for.cond127.preheader ], [ %inc191, %for.cond127 ]
+  %idxprom130 = sext i32 %uv.013 to i64
+  br i1 undef, label %for.cond135.preheader.lr.ph, label %for.end185
+
+for.cond135.preheader.lr.ph:
+  br i1 undef, label %for.cond135.preheader.lr.ph.split.us, label %for.cond135.preheader.lr.ph.split_crit_edge
+
+for.cond135.preheader.lr.ph.split_crit_edge:
+  br label %for.cond135.preheader.lr.ph.split
+
+for.cond135.preheader.lr.ph.split.us:
+  br label %for.cond135.preheader.us
+
+for.cond135.preheader.us:
+  %block_y.09.us = phi i32 [ 0, %for.cond135.preheader.lr.ph.split.us ], [ %add184.us, %for.cond132.us ]
+  br i1 true, label %for.cond138.preheader.lr.ph.us, label %for.end178.us
+
+for.end178.us:
+  %add184.us = add nsw i32 %block_y.09.us, 4
+  br i1 undef, label %for.end185split.us-lcssa.us, label %for.cond132.us
+
+for.end174.us:
+  br i1 undef, label %for.cond138.preheader.us, label %for.cond135.for.end178_crit_edge.us
+
+for.inc172.us:
+  br i1 undef, label %for.cond142.preheader.us, label %for.end174.us
+
+for.body145.us:
+  %arrayidx163.us = getelementptr inbounds %struct.Params* undef, i64 0, i32 0, i64 %idxprom130, i64 %idxprom146.us
+  br i1 undef, label %for.body145.us, label %for.inc172.us
+
+for.cond142.preheader.us:
+  %j.04.us = phi i32 [ %block_y.09.us, %for.cond138.preheader.us ], [ undef, %for.inc172.us ]
+  %idxprom146.us = sext i32 %j.04.us to i64
+  br label %for.body145.us
+
+for.cond138.preheader.us:
+  br label %for.cond142.preheader.us
+
+for.cond132.us:
+  br i1 undef, label %for.cond135.preheader.us, label %for.cond132.for.end185_crit_edge.us-lcssa.us
+
+for.cond138.preheader.lr.ph.us:
+  br label %for.cond138.preheader.us
+
+for.cond135.for.end178_crit_edge.us:
+  br label %for.end178.us
+
+for.end185split.us-lcssa.us:
+  br label %for.end185split
+
+for.cond132.for.end185_crit_edge.us-lcssa.us:
+  br label %for.cond132.for.end185_crit_edge
+
+for.cond135.preheader.lr.ph.split:
+  br label %for.end185split
+
+for.end185split:
+  br label %for.end185
+
+for.cond132.for.end185_crit_edge:
+  br label %for.end185
+
+for.end185:
+  %inc191 = add nsw i32 %uv.013, 1
+  br i1 false, label %for.end192, label %for.cond127
+
+for.end192:
+  br label %for.inc203
+
+for.inc203:
+  br label %for.end205
+
+for.end205:
+  ret void
+}