Add a basic testcase for TBAA-aware LICM.

llvm-svn: 116745

1 files changed, 33 insertions, 0 deletions

diff --git a/llvm/test/Analysis/TypeBasedAliasAnalysis/licm.ll b/llvm/test/Analysis/TypeBasedAliasAnalysis/licm.ll
new file mode 100644
index 00000000000..eedc1e85891
--- /dev/null
+++ b/llvm/test/Analysis/TypeBasedAliasAnalysis/licm.ll
@@ -0,0 +1,33 @@
+; RUN: opt -tbaa -licm -enable-tbaa -S < %s | FileCheck %s
+
+; LICM should be able to hoist the address load out of the loop
+; by using TBAA information.
+
+; CHECK:      entry:
+; CHECK-NEXT:   %tmp3 = load double** @P, !tbaa !0
+; CHECK-NEXT:   br label %for.body
+
+@P = common global double* null
+
+define void @foo(i64 %n) nounwind {
+entry:
+  br label %for.body
+
+for.body:                                         ; preds = %entry, %for.body
+  %i.07 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
+  %tmp3 = load double** @P, !tbaa !1
+  %scevgep = getelementptr double* %tmp3, i64 %i.07
+  %tmp4 = load double* %scevgep, !tbaa !2
+  %mul = fmul double %tmp4, 2.300000e+00
+  store double %mul, double* %scevgep, !tbaa !2
+  %inc = add i64 %i.07, 1
+  %exitcond = icmp eq i64 %inc, %n
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body, %entry
+  ret void
+}
+
+!0 = metadata !{metadata !"root", null}
+!1 = metadata !{metadata !"pointer", metadata !0}
+!2 = metadata !{metadata !"double", metadata !0}