[Hexagon] Add more lit tests

llvm-svn: 327271

1 files changed, 34 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/Hexagon/swp-reuse-phi.ll b/llvm/test/CodeGen/Hexagon/swp-reuse-phi.ll
new file mode 100644
index 00000000000..a3221e56b34
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/swp-reuse-phi.ll
@@ -0,0 +1,34 @@
+; RUN: llc -march=hexagon -enable-pipeliner -fp-contract=fast < %s
+; REQUIRES: asserts
+
+; Test that the code which reuses existing Phis works when the Phis are used
+; in multiple stages. In this case, one can be reused, but the other must be
+; generated.
+
+; Function Attrs: nounwind
+define void @f0(i32 %a0) #0 {
+b0:
+  %v0 = icmp sgt i32 %a0, 0
+  br i1 %v0, label %b1, label %b2
+
+b1:                                               ; preds = %b1, %b0
+  %v1 = phi i32 [ %v11, %b1 ], [ 0, %b0 ]
+  %v2 = phi float [ %v4, %b1 ], [ undef, %b0 ]
+  %v3 = phi float [ %v2, %b1 ], [ undef, %b0 ]
+  %v4 = load float, float* undef, align 4
+  %v5 = fmul float %v4, 0x3FEFAA0000000000
+  %v6 = fadd float undef, %v5
+  %v7 = fmul float %v2, 0xBFFFAA0000000000
+  %v8 = fadd float %v7, %v6
+  %v9 = fmul float %v3, 0x3FEFAA0000000000
+  %v10 = fadd float %v9, %v8
+  store float %v10, float* undef, align 4
+  %v11 = add nsw i32 %v1, 1
+  %v12 = icmp eq i32 %v11, %a0
+  br i1 %v12, label %b2, label %b1
+
+b2:                                               ; preds = %b1, %b0
+  ret void
+}
+
+attributes #0 = { nounwind "target-cpu"="hexagonv55" }