Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Analysis/MemorySSA/function-mem-attrs.ll

@@ -0,0 +1,59 @@
+; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
+; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
+;
+; Test that various function attributes give us sane results.
+
+@g = external global i32
+
+declare void @readonlyFunction() readonly
+declare void @noattrsFunction()
+
+define void @readonlyAttr() {
+; CHECK: 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT: store i32 0
+  store i32 0, i32* @g, align 4
+
+  %1 = alloca i32, align 4
+; CHECK: 2 = MemoryDef(1)
+; CHECK-NEXT: store i32 0
+  store i32 0, i32* %1, align 4
+
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: call void @readonlyFunction()
+  call void @readonlyFunction()
+
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: call void @noattrsFunction() #
+; Assume that #N is readonly
+  call void @noattrsFunction() readonly
+
+  ; Sanity check that noattrsFunction is otherwise a MemoryDef
+; CHECK: 3 = MemoryDef(2)
+; CHECK-NEXT: call void @noattrsFunction()
+  call void @noattrsFunction()
+  ret void
+}
+
+declare void @argMemOnly(i32*) argmemonly
+
+define void @inaccessableOnlyAttr() {
+  %1 = alloca i32, align 4
+; CHECK: 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT: store i32 0
+  store i32 0, i32* %1, align 4
+
+; CHECK: 2 = MemoryDef(1)
+; CHECK-NEXT: store i32 0
+  store i32 0, i32* @g, align 4
+
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: call void @argMemOnly(i32* %1) #
+; Assume that #N is readonly
+  call void @argMemOnly(i32* %1) readonly
+
+; CHECK: 3 = MemoryDef(2)
+; CHECK-NEXT: call void @argMemOnly(i32* %1)
+  call void @argMemOnly(i32* %1)
+
+  ret void
+}