Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Analysis/CFLAliasAnalysis/Steensgaard/arguments-globals.ll

@@ -0,0 +1,20 @@
+; This testcase ensures that CFL AA gives conservative answers on variables
+; that involve arguments.
+; (Everything should alias everything, because args can alias globals, so the
+; aliasing sets should of args+alloca+global should be combined)
+
+; RUN: opt < %s -disable-basicaa -cfl-steens-aa -aa-eval -print-may-aliases -disable-output 2>&1 | FileCheck %s
+
+; CHECK:     Function: test
+
+@g = external global i32
+
+define void @test(i1 %c, i32* %arg1, i32* %arg2) {
+  ; CHECK: 15 Total Alias Queries Performed
+  ; CHECK: 0 no alias responses
+  %A = alloca i32, align 4
+  %B = select i1 %c, i32* %arg1, i32* %arg2
+  %C = select i1 %c, i32* @g, i32* %A
+
+  ret void
+}