Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Transforms/GlobalOpt/phi-select.ll

@@ -0,0 +1,27 @@
+; Test that PHI nodes and select instructions do not necessarily make stuff
+; non-constant.
+
+; RUN: opt < %s -globalopt -S | FileCheck %s
+; CHECK-NOT: global
+
+@X = internal global i32 4              ; <i32*> [#uses=2]
+@Y = internal global i32 5              ; <i32*> [#uses=2]
+
+define i32 @test1(i1 %C) {
+        %P = select i1 %C, i32* @X, i32* @Y             ; <i32*> [#uses=1]
+        %V = load i32, i32* %P               ; <i32> [#uses=1]
+        ret i32 %V
+}
+
+define i32 @test2(i1 %C) {
+; <label>:0
+        br i1 %C, label %T, label %Cont
+
+T:              ; preds = %0
+        br label %Cont
+
+Cont:           ; preds = %T, %0
+        %P = phi i32* [ @X, %0 ], [ @Y, %T ]            ; <i32*> [#uses=1]
+        %V = load i32, i32* %P               ; <i32> [#uses=1]
+        ret i32 %V
+}