Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Transforms/DeadArgElim/basictest.ll

@@ -0,0 +1,36 @@
+; RUN: opt < %s -deadargelim -S | not grep DEADARG
+
+; test - an obviously dead argument
+define internal i32 @test(i32 %v, i32 %DEADARG1, i32* %p) {
+        store i32 %v, i32* %p
+        ret i32 %v
+}
+
+; hardertest - an argument which is only used by a call of a function with a 
+; dead argument.
+define internal i32 @hardertest(i32 %DEADARG2) {
+        %p = alloca i32         ; <i32*> [#uses=1]
+        %V = call i32 @test( i32 5, i32 %DEADARG2, i32* %p )            ; <i32> [#uses=1]
+        ret i32 %V
+}
+
+; evenhardertest - recursive dead argument...
+define internal void @evenhardertest(i32 %DEADARG3) {
+        call void @evenhardertest( i32 %DEADARG3 )
+        ret void
+}
+
+define internal void @needarg(i32 %TEST) {
+        call i32 @needarg2( i32 %TEST )         ; <i32>:1 [#uses=0]
+        ret void
+}
+
+define internal i32 @needarg2(i32 %TEST) {
+        ret i32 %TEST
+}
+
+define internal void @needarg3(i32 %TEST3) {
+        call void @needarg( i32 %TEST3 )
+        ret void
+}
+