1 files changed, 45 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/machine_cse.ll b/test/CodeGen/AArch64/machine_cse.ll
new file mode 100644
index 0000000..bc9ab10
--- /dev/null
+++ b/test/CodeGen/AArch64/machine_cse.ll
@@ -0,0 +1,45 @@
+; RUN: llc < %s -mtriple=aarch64-linux-gnuabi -O2 | FileCheck %s
+
+; marked as external to prevent possible optimizations
+@a = external global i32
+@b = external global i32
+@c = external global i32
+@d = external global i32
+@e = external global i32
+
+define void @combine-sign-comparisons-by-cse(i32 *%arg) {
+; CHECK: cmp
+; CHECK: b.ge
+; CHECK-NOT: cmp
+; CHECK: b.le
+
+entry:
+  %a = load i32* @a, align 4
+  %b = load i32* @b, align 4
+  %c = load i32* @c, align 4
+  %d = load i32* @d, align 4
+  %e = load i32* @e, align 4
+
+  %cmp = icmp slt i32 %a, %e
+  br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
+
+land.lhs.true:
+  %cmp1 = icmp eq i32 %b, %c
+  br i1 %cmp1, label %return, label %if.end
+
+lor.lhs.false:
+  %cmp2 = icmp sgt i32 %a, %e
+  br i1 %cmp2, label %land.lhs.true3, label %if.end
+
+land.lhs.true3:
+  %cmp4 = icmp eq i32 %b, %d
+  br i1 %cmp4, label %return, label %if.end
+
+if.end:
+  br label %return
+
+return:
+  %retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
+  store i32 %a, i32 *%arg
+  ret void
+}