Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Assembler/ConstantExprFoldCast.ll

@@ -0,0 +1,29 @@
+; This test checks to make sure that constant exprs fold in some simple situations
+
+; RUN: llvm-as < %s | llvm-dis | FileCheck %s
+; RUN: verify-uselistorder %s
+
+; CHECK-NOT: bitcast
+; CHECK-NOT: trunc
+; CHECK: addrspacecast
+; CHECK: addrspacecast
+
+@A = global i32* bitcast (i8* null to i32*)  ; Cast null -> fold
+@B = global i32** bitcast (i32** @A to i32**)   ; Cast to same type -> fold
+@C = global i32 trunc (i64 42 to i32)        ; Integral casts
+@D = global i32* bitcast(float*  bitcast (i32* @C to float*) to i32*)  ; cast of cast ptr->ptr
+@E = global i32 ptrtoint(float* inttoptr (i8 5 to float*) to i32)  ; i32 -> ptr -> i32
+
+; Test folding of binary instrs
+@F = global i32* inttoptr (i32 add (i32 5, i32 -5) to i32*)
+@G = global i32* inttoptr (i32 sub (i32 5, i32 5) to i32*)
+
+; Address space cast AS0 null-> AS1 null
+@H = global i32 addrspace(1)* addrspacecast(i32* null to i32 addrspace(1)*)
+
+; Address space cast AS1 null-> AS0 null
+@I = global i32* addrspacecast(i32 addrspace(1)* null to i32*)
+
+; Bitcast -> GEP
+@J = external global { i32 }
+@K = global i32* bitcast ({ i32 }* @J to i32*)