SimplifyCFG: Don't duplicate calls to functions marked noduplicate v2

v2:
  - Use CI->cannotDuplicate()

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193115 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 37 insertions, 0 deletions

diff --git a/test/Transforms/SimplifyCFG/attr-noduplicate.ll b/test/Transforms/SimplifyCFG/attr-noduplicate.ll
new file mode 100644
index 0000000000..523aa51bb8
--- /dev/null
+++ b/test/Transforms/SimplifyCFG/attr-noduplicate.ll
@@ -0,0 +1,37 @@
+; RUN: opt < %s -simplifycfg -S | FileCheck %s
+
+; This test checks that the SimplifyCFG pass won't duplicate a call to a
+; function marked noduplicate.
+;
+; CHECK-LABEL: @noduplicate
+; CHECK: call void @barrier
+; CHECK-NOT: call void @barrier
+define void @noduplicate(i32 %cond, i32* %out) {
+entry:
+  %out1 = getelementptr i32* %out, i32 1
+  %out2 = getelementptr i32* %out, i32 2
+  %cmp = icmp eq i32 %cond, 0
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:
+  store i32 5, i32* %out
+  br label %if.end
+
+if.end:
+  call void @barrier() #0
+  br i1 %cmp, label %cond.end, label %cond.false
+
+cond.false:
+  store i32 5, i32* %out1
+  br label %cond.end
+
+cond.end:
+  %value = phi i32 [ 1, %cond.false ], [ 0, %if.end ]
+  store i32 %value, i32* %out2
+  ret void
+}
+
+; Function Attrs: noduplicate nounwind
+declare void @barrier() #0
+
+attributes #0 = { noduplicate nounwind }