Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Transforms/SimplifyCFG/PhiEliminate.ll

@@ -0,0 +1,27 @@
+; Test a bunch of cases where the cfg simplification code should
+; be able to fold PHI nodes into computation in common cases.  Folding the PHI
+; nodes away allows the branches to be eliminated, performing a simple form of
+; 'if conversion'.
+
+; RUN: opt < %s -simplifycfg -S > %t.xform
+; RUN:   not grep phi %t.xform 
+; RUN:   grep ret %t.xform
+
+declare void @use(i1)
+
+declare void @use.upgrd.1(i32)
+
+
+define void @test(i1 %c, i32 %V, i32 %V2) {
+; <label>:0
+        br i1 %c, label %T, label %F
+T:              ; preds = %0
+        br label %F
+F:              ; preds = %T, %0
+        %B1 = phi i1 [ true, %0 ], [ false, %T ]                ; <i1> [#uses=1]
+        %I6 = phi i32 [ %V, %0 ], [ 0, %T ]             ; <i32> [#uses=1]
+        call void @use( i1 %B1 )
+        call void @use.upgrd.1( i32 %I6 )
+        ret void
+}
+