1 files changed, 38 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/Hexagon/swp-maxstart.ll b/llvm/test/CodeGen/Hexagon/swp-maxstart.ll
new file mode 100644
index 00000000000..811c94062a0
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/swp-maxstart.ll
@@ -0,0 +1,38 @@
+; RUN: llc -march=hexagon -O3 < %s | FileCheck %s
+
+; Test that the MinStart computation, which is based upon the length
+; of the chain edges, is computed correctly. A bug in the code allowed
+; two instuctions that have a chain edge to be scheduled more than II
+; instructions apart. In this test, if two stores appear before the
+; store, then that is a bug.
+
+; CHECK: r{{[0-9]+}} = memw([[REG0:r([0-9]+)]]+#12)
+; CHECK-NOT: r{{[0-9]+}} = memw([[REG0]]+#12)
+; CHECK: memw([[REG0]]+#12) = r{{[0-9]+}}
+
+%s.0 = type { i64, i32, i32, i32, i8* }
+
+@g0 = external global %s.0, align 8
+
+; Function Attrs: nounwind
+define void @f0() #0 {
+b0:
+  %v0 = load i32, i32* getelementptr inbounds (%s.0, %s.0* @g0, i32 0, i32 1), align 8
+  %v1 = ashr i32 %v0, 3
+  br i1 undef, label %b1, label %b2
+
+b1:                                               ; preds = %b1, %b0
+  %v2 = phi i32 [ %v5, %b1 ], [ 0, %b0 ]
+  %v3 = load i8*, i8** getelementptr inbounds (%s.0, %s.0* @g0, i32 0, i32 4), align 4
+  %v4 = getelementptr inbounds i8, i8* %v3, i32 -1
+  store i8* %v4, i8** getelementptr inbounds (%s.0, %s.0* @g0, i32 0, i32 4), align 4
+  store i8 0, i8* %v4, align 1
+  %v5 = add nsw i32 %v2, 1
+  %v6 = icmp eq i32 %v5, %v1
+  br i1 %v6, label %b2, label %b1
+
+b2:                                               ; preds = %b1, %b0
+  ret void
+}
+
+attributes #0 = { nounwind "target-cpu"="hexagonv60" }