1 files changed, 56 insertions, 0 deletions
diff --git a/llvm/test/Transforms/GVN/preserve-analysis.ll b/llvm/test/Transforms/GVN/preserve-analysis.ll
new file mode 100644
index 00000000000..2454bb1a63d
--- /dev/null
+++ b/llvm/test/Transforms/GVN/preserve-analysis.ll
@@ -0,0 +1,56 @@
+; RUN: opt < %s -debug-pass=Structure -indvars -gvn -indvars 2>&1 -S | FileCheck --check-prefix=CHECK --check-prefix=IR %s
+; RUN: opt < %s -debug-pass-manager -passes='require<domtree>,loop(simplify-cfg),gvn,loop(indvars)' 2>&1 -S | FileCheck --check-prefix=NEW-PM --check-prefix=IR %s
+
+; Check CFG-only analysis are preserved by SCCP by running it between 2
+; loop-vectorize runs.
+
+; CHECK: Dominator Tree Construction
+; CHECK: Natural Loop Information
+; CHECK: Canonicalize natural loops
+; CHECK: LCSSA Verifier
+; CHECK: Loop-Closed SSA Form Pass
+; CHECK: Global Value Numbering
+; CHECK-NOT: Dominator Tree Construction
+; CHECK-NOT: Natural Loop Information
+; CHECK-NOT: Canonicalize natural loops
+
+; NEW-PM-DAG: Running analysis: LoopAnalysis on test
+; NEW-PM-DAG: Running analysis: DominatorTreeAnalysis on test
+; NEW-PM: Running pass: GVN on test
+; NEW-PM-NOT: Running analysis: LoopAnalysis on test
+; NEW-PM-NOT: Running analysis: DominatorTreeAnalysis on test
+
+declare i1 @cond()
+declare void @dostuff()
+
+define i32 @test() {
+; IR-LABEL: define i32 @test()
+; IR-LABEL: header:
+; IR:         br i1 false, label %then, label %latch
+; IR-LABEL: then:
+; IR-NEXT:   call void @dostuff()
+; IR-NEXT:   br label %latch
+entry:
+  %res = add i32 1, 10
+  br label %header
+
+header:
+  %iv = phi i32 [ %res, %entry ], [ 0, %latch ]
+  %ic = icmp eq i32 %res, 99
+  br i1 %ic, label %then, label %latch
+
+then:
+  br label %then.2
+
+then.2:
+  call void @dostuff()
+  br label %latch
+
+
+latch:
+  %ec = call i1 @cond()
+  br i1 %ec, label %exit, label %header
+
+exit:
+  ret i32 %iv
+}