1 files changed, 62 insertions, 0 deletions
diff --git a/test/CodeGen/X86/sink-cheap-instructions.ll b/test/CodeGen/X86/sink-cheap-instructions.ll
new file mode 100644
index 0000000..9b9a686
--- /dev/null
+++ b/test/CodeGen/X86/sink-cheap-instructions.ll
@@ -0,0 +1,62 @@
+; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s -check-prefix=CHECK
+; RUN: llc < %s -mtriple=x86_64-linux -sink-insts-to-avoid-spills | FileCheck %s -check-prefix=SINK
+
+; Ensure that we sink copy-like instructions into loops to avoid register
+; spills.
+
+; CHECK: Spill
+; SINK-NOT: Spill
+
+%struct.A = type { i32, i32, i32, i32, i32, i32 }
+
+define void @_Z1fPhP1A(i8* nocapture readonly %input, %struct.A* %a) {
+  %1 = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 0
+  %2 = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 1
+  %3 = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 2
+  %4 = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 3
+  %5 = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 4
+  %6 = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 5
+  br label %.backedge
+
+.backedge:
+  %.0 = phi i8* [ %input, %0 ], [ %7, %.backedge.backedge ]
+  %7 = getelementptr inbounds i8, i8* %.0, i64 1
+  %8 = load i8, i8* %7, align 1
+  switch i8 %8, label %.backedge.backedge [
+    i8 0, label %9
+    i8 10, label %10
+    i8 20, label %11
+    i8 30, label %12
+    i8 40, label %13
+    i8 50, label %14
+  ]
+
+; <label>:9
+  tail call void @_Z6assignPj(i32* %1)
+  br label %.backedge.backedge
+
+; <label>:10
+  tail call void @_Z6assignPj(i32* %2)
+  br label %.backedge.backedge
+
+.backedge.backedge:
+  br label %.backedge
+
+; <label>:11
+  tail call void @_Z6assignPj(i32* %3)
+  br label %.backedge.backedge
+
+; <label>:12
+  tail call void @_Z6assignPj(i32* %4)
+  br label %.backedge.backedge
+
+; <label>:13
+  tail call void @_Z6assignPj(i32* %5)
+  br label %.backedge.backedge
+
+; <label>:14
+  tail call void @_Z6assignPj(i32* %6)
+  br label %.backedge.backedge
+}
+
+declare void @_Z6assignPj(i32*)